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Alfalfa
Medicago sativa
- Height 1 - 3 ft.
- CA Bloom Jun - Aug
- Like a clover but taller, and with serrated leaves.
- Purple pea-like flowers cluster in small groups at the end of multiple stems.
- Used in agriculture, you'll find Alfalfa in disturbed areas near farms.
- Not CA native
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Clusters of small purple pea-like flowers.
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Leaves in 3, serrated, with short petioles connecting them to the stem.
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Grows erect. The pea pod twists into a coil.
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Alkali Bulrush
Bolboschoenus maritimus
- CA Bloom Aug - Sep
- Flat, narrow stems to about four feet tall.
- Found near the edge of salt water.
- Widespread in California and around the world.
- CA native
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Flowers dark brown with tan bristles.
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Flowers group in the joint of flat stems.
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Stands erect with noticeable brown flowers
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Alum Root
Heuchera micrantha
- CA Bloom May - June
- Alum Root sends wispy stems two feet in the air, supporting dozens of tiny white or pink flowers.
- Leaves at the base of plant are shaped like mittens.
- Found in wet areas, often near moss.
- CA native
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Tiny flowers on leafless wispy stems about 2 feet tall.
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Leaves connect to the base of the plant on long stalks. They're fuzzy and roundish.
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Leaves form a thick basal cluster, with tiny flowers appearing to be suspended in air above them.
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American Dogwood
Cornus sericea
- CA Bloom Jun - Aug
- White 4-petaled flowers in round bunches
- White berries
- Medium tall shrub grows to 12 feet
- Opposite leaves, green above and hairy grey below
- Found in damp areas
- CA native
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Opposite leaves, strong veins, pointed tips.
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Showy clumps of flowers turn into white berries.
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4-petaled white flowers grow in clumps at the end of stems.
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American Vetch
Vicia americana
- CA Bloom May - Jun
- Flowers with pink, violet and white parts.
- Tendrils, modified leaves, allow the plant to climb on other plants.
- Alternate compound leaves.
- A widespread understory plant.
- CA native
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Purple pea-like flowers
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Alternate compound leaves.
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Vine grows to a foot long. One inch pea pods for fruit.
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American Vetch (1)
Vicia americana ssp. americana
- Height 1 - 2 ft.
- CA Bloom May - Jun
- Flowers with pink, violet and white parts.
- Tendrils, modified leaves, allow the plant to climb on others.
- The vine stem can grow to 4 feet long, but the plant is generally under 2 feet tall.
- Alternate compound leaves.
- Widespread understory plant.
- CA native
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Small but bright flowers
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Lots of small compound leaflets.
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Long thin leaves and purple flowers make this a vetch.
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Annual Beard Grass
Polypogon monspeliensis
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Annual Beard Grass is topped by large, fluffy spikes. They're framed by flat, rough, green leaves to 8" long.
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Soft, dense spikelets are green until they mature. There are lots of spikelets in the spike, each producing 3 awns.
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Long awns let light through around the edge but the center is opaque.
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Annual Blue Grass
Poa annua
- Annual Bunch Grass 1-8"
- 3-6 florets per spikelet
- No awns
- CA Bloom Apr - May
- Poa is an ancient Greek word for "fodder".
- This sweet grass is grazed by farm animals.
- Seeds are distributed 8 months a year.
- Not CA native
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Bright green or yellow-green leaves are soft, generally flat and come to a blunt point at the tips.
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Like all Bluegrasses, the inflorescence is open and spikelets have no awns. Florets are membranous.
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Annual Blue Grass grows quickly in disturbed areas. Plants are small but have many leaves.
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Annual June Grass, Bristly Koeleria
Koeleria gerardii
CA Bloom Apr - Jul
Not CA native
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Arroyo Lupine
Lupinus succulentus
- Grows to 3 ft. on erect, sparsely hairy stems.
- CA Bloom Feb - May
- This annual flower produces 6" clusters of purple pea flowers.
- Wide-tipped leaflets grow on long (2-6") stalks.
- It is abundant in open or disturbed areas, and is often seeded on road banks.
- CA native
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Look for radial leaflets that are wider near the tip. Their fleshy top feels rubbery.
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Here's a closeup of the flower. The yellow pistil is just sticking out of the right-hand keel. The left part is the banner.
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Stacks of whorled flowers have white banner spots that turn magenta with age.
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Arroyo Willow
Salix lasiolepis
- Height 7 - 35 ft.
- CA Bloom Feb - May
- This is the most common willow in California.
- It's deciduous and is found near water.
- Look for narrow leaves that are wider near the tip than at the base.
- CA native.
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Leaves are about 5 inches long, smooth-sided and narrow. They're pale/hairy underneath, and wider near the tip than near the base.
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Classic pussies with yellow stamens. The buds are fused together (not overlapping) before they open.
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This willow has many trunks, sometimes growing as a tree, and sometimes as a tangled shrub.
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Australian Fireweed
Senecio glomeratus
- CA Bloom Apr - Sep
- Yellow composite flowers group at the top of a branched 6 foot plant.
- Leaves are alternate and deeply lobed.
- Found in disturbed sites below 1,000 feet, generally near the coast.
- Not CA native
- Moderately Invasive
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Composite flowers group at the top of the stem. They have no "petals" ( ray flowers).
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Leaves clasp the stem, grow to about 6 inches, and are deeply lobed.
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Grows to 6 feet or so, with lots of flowers near the top of the stem.
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Baneberry
Actaea rubra
- Height 8 in. - 3 ft.
- CA Bloom May - Jul
- Baneberry is a shrub that grows to about 3 feet tall.
- Leaves are coarsely toothed.
- Bright red or white berries are hard to miss, and warn animals that they're poisonous.
- White showy flower clusters.
- Found in shady, moist woodland.
- CA native
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Leaves have deeply toothed margins. Poisonous berries are red or white, with a black dot.
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White showy clusters of flowers stand out on their own stalks. Each flower has many long stamens.
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Leaves are compound and sharply toothed. Leaves and flowers are on separate stalks.
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Beaked Hazelnut
Corylus cornuta
CA Bloom Feb - Mar
Tiny petals
Alternate leaves
Streambanks slopes
CA native
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Bearded Clover
Trifolium barbigerum
- Height to 1 ft.
- CA Bloom Feb - May
- Brown, pink, violet, white flower
- Irreg petals
- Alternate leaves
- CA native
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Bearded Sprangletop
Leptochloa fusca ssp. fascicularis
CA Bloom Jun - Oct
CA native
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Beardless Wild Rye
Elymus triticoides
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This rye has 2-ranked spikelets that connect directly to the stem. There is space between each alternating spikelet.
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Hollow stems (like straws) connect at solid joints. Leaves are about 1/4" wide and a foot long.
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Prominent blue-green leaves are 4-12" long and grow away from the stem. Found in moist habitats with heavy soils.
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Bee Plant
Scrophularia californica
- Height 2 - 4 ft.
- CA Bloom Feb - May
- Bee plant is tall, with prominent triangular leaves and tiny brownish-red flowers.
- Small flowers are less than 1/2" across and have a nectar disk to reward pollinating bees.
- Opposite leaves have stalks that connect to the stem.
- Found in moist places below 8,000 feet.
- CA native
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This view of the flower from below shows two rounded petals on top, two side petals, and one folded out like a tongue.
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A square stem supports large, opposite, toothed leaves. This might make you think "Mint" but it's not.
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Bee Plant grows several feet high with opposite, narrow leaves sticking straight out. Flowers are on horizontal stalks near the top.
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Bermuda Grass
Cynodon dactylon
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Spikelets are tiny (<1/10") and purple. Tight colonies of plants are connected by rhizomes and stolons.
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Two rows of spikelets connect to one side of finger-like branches that all join at the top of the stem.
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The ligule is white and hairy. Leaf blades are short, flat and fleshy.
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Big Leaf Mistletoe
Phoradendron leucarpum ssp. macrophyllum
Shrub
Green flower
Tiny petals
Opposite leaves
CA native
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Big Scale Balsam Root
Balsamorhiza macrolepis
CA Bloom Mar - Jun
Yellow flower
Many petals
Basal leaves
Slopes
CA native Endangered (CNPS 1B)
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Big Tarweed
Blepharizonia plumosa
CA Bloom Jul - Oct
CA native Endangered (CNPS 1B)
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Bioletti Cudweed
Pseudognaphalium biolettii
- CA Bloom Jan - May
- Flowers are white on the outside and yellow on the inside.
- Alternate leaves are wide at the base and clasp the stem.
- Leaves and stem are covered with short fine hair, not sticky but sharply scented.
- Found in coastal chaparral and in mixed evergreens in the foothills.
- CA native
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Shiny papery phyllaries surround tiny yellow aster flowers.
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Many tiny brown fruits.
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Grows to 3 feet, sometimes woody at the base.
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Bird's Foot Lotus
Acmispon brachycarpus
- Height 6 in. - 1 ft.
- CA Bloom Mar - Jun
- Yellow flower
- Pea petals
- Alternate leaves
- CA native
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Bird's Foot Trefoil
Lotus corniculatus
- Height to 8 in.
- CA Bloom May - Jul
- Tiny fruit clusters look like a bird's foot.
- Short, thin compound leaves make bundles along the stem.
- Find it in open grasslands, wetlands, and compacted soil along roads and trails.
- Other Trefoils
- Not CA native
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Tiny pea flowers cluster at the end of the stem.
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Each plant is small. See fruit pods on the left, compound leaves in the middle, and a flower cluster on the right.
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Colonies of Bird's Foot Trefoil can be prominent in grasslands. It is sometimes vine-like, with prostrate stems up to 20 inches.
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Bitter Cherry
Prunus emarginata
- CA Bloom Apr - May
- White 5-petaled flowers about 1/2" across smell nice.
- Leaves yellow-green with tightly-spaced veins.
- A shrub to medium-sized tree.
- Canyons, slopes, ridges, open woods in nutrient-rich soil.
- CA native
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3-10 small flowers per cluster, 5 separate petals, long stamens.
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Leaves to 3 inches long with bumpy edges. Red cherries, each with its own stalk.
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Bitter Cherry forms thickets on sunny hillsides.
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Black Cottonwood
Populus trichocarpa
- CA Bloom Feb - Apr
- A large riparian tree with alternate leaves
- Leaf stems are round (Fremont Cottonwood's is flattened).
- Widely distributed in California, except the central valley.
- CA native
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Leaf tops are glossy dark-green. Undersides are pale. Leaves are long and pointed, with small teeth on the edge.
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Alternating secondary veins connect to a central one.
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Grows near running water. Trunks get very large, and the tree height often exceeds 100 feet.
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Black Mustard
Brassica nigra
CA Bloom Apr - Jul
Yellow flower
Four petals
Alternate leaves
Not CA native Moderately Invasive
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Blue Blossom
Ceanothus thyrsiflorus var. thyrsiflorus
- Height to 30 ft.
- CA Bloom Mar - May
- Blueblossom is an evergreen shrub with a prodigious display of sweet-smelling flowers.
- Look for grooves running the length of the stem.
- Grows well on poor soil. Found in a variety of habitats.
- CA native
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Blueblossom is full of tiny, fragrant flowers when it blooms in spring.
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Alternate leaves have 3 veins that join at the base. The underside is dull and the top is shiny.
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Leaves are shiny and dark green on top, growing to 2 inches long. They have glandular bumps on the side.
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Blue Dicks
Dipterostemon capitatus
- CA Bloom Feb - Apr
- Look for a tight bunch of 6-petaled flowers on a single stem, about 1 foot tall.
- Flowers can be purple, pink or white.
- This common springtime flower is widespread where there is sun.
- Compare to Ookow
- CA native
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A tight bunch of 6-petaled flowers appears at the top of a tall, wavy stalk.
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The centers of the flowers feature a forked, white sheath that surrounds yellow-tipped stamens.
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Long, narrow leaves grow from the base of the plant. Below, the roots connect to food-storing corms.
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Blue Elderberry
Sambucus mexicana
- CA Bloom Mar - Jul
- A large shrub with clusters of white flowers, plus compound leaves indicate an Elderberry.
- Berries are black but appear blue because of a waxy covering.
- Grey bark with vertical furrows.
- Common on stream banks and open places in forests.
- CA native
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White flat-topped clusters of flowers are easy to spot.
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Berries with a waxy covering makes them look powdery.
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Compound leaves with 5 - 9 toothed leaflets.
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Blue Fescue
Festuca idahoensis
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Found in dry, open or shady places, Blue Fescue may appear bluer than plants around it.
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Spikelets are about 1/2" long. There's enough room between spikelets to see wavy branches.
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Spikelets are flattish, with 2-ranked florets. They're held close to the stem until mature. Awns are thread-like.
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Blue Gum
Eucalyptus globulus
- Height to 200 ft.
- CA Bloom Oct - Mar
- Flower nestled between stem and leaf.
- Leaves long, thin and dark green.
- Common, found in disturbed areas.
- Not CA native
- Somewhat Invasive
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Flower has many white stamens surrounding a central knob, and smells of honey.
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Mature leaves are narrow and curved, growing to a foot long. Woody fruits with 5 notches, grow to 1 inch across.
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Heavy trunks with bark that peals in large strips.
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Blue-Eyed Grass
Sisyrinchium bellum
- Height 1 - 2 ft.
- CA Bloom Mar - May
- This is not a grass but an iris.
- At the top of each stem are violet flowers with darker purple lines leading to a yellow center.
- It's common in open, usually moist areas.
- CA native. Endemic to the California Floristic Province.
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Beautiful 1/2" wide flowers have blue to violet petals and a golden yellow center to guide pollinators in.
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Leaves are grass-like, narrow with parallel veins.
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The ovary is below the flower and, if pollinated, develops into a capsule-like fruit.
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Bog Yellowcress
Rorippa palustris ssp. palustris
CA Bloom Apr - Jun
Yellow flower
Four petals
Alternate leaves
CA native
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Box Elder
Acer negundo
- Height 25 - 66 ft.
- CA Bloom Feb - Mar
- Opposite leaves
- Streambanks
- CA native
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Bracken Fern
Pteridium aquilinum var. pubescens
- Bracken Fern's overall shape is a large triangle, which is easy to spot.
- It's green in the spring and brown in the fall and winter.
- It grows to four feet tall.
- Widespread and common, it's found in shaded forest and on open hillsides.
- CA native
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Bracken Fern frond segments are long at the base and quite short near the top, creating an overall triangle shape.
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Segments have regular rounded lobes. The similar Sword Fern has a "thumb" near its midrib.
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New growth forms in a fiddlehead, and then opens up.
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Branched Indian Clover
Trifolium dichotomum
CA Bloom Mar - May
Black, brown, pink, white flower
Irreg petals
Alternate leaves
CA native
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Branching Phacelia
Phacelia ramosissima
CA Bloom May - Aug
Violet, white flower
Five petals
Alternate leaves
Coastal
CA native
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Brewer's Ragwort
Packera breweri
CA Bloom Apr - May
Yellow flower
Many petals
Alternate, basal leaves
Slopes
CA native
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Brewer's Rock Cress
Boechera breweri
CA Bloom Feb - May
Violet flower
Four petals
Alternate, basal leaves
Slopes
CA native
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Brewer's Rockcress
Boechera breweri ssp. breweri
CA Bloom Feb - May
Violet flower
Four petals
Alternate, basal leaves
CA native
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Brewer's Saltbrush
Atriplex lentiformis
CA Bloom Jun - Jul
Yellow flower
Tiny petals
Alternate leaves
Coastal salt-marsh
CA native
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Bristly Linanthus
Leptosiphon aureus
CA Bloom Mar - Jun
Pink, white, yellow flower
Five petals
Opposite leaves
CA native Uncommon (CNPS 4)
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Bristly Ox-Tongue
Helminthotheca echioides
- Height to 7 ft.
- CA Bloom Jun - Dec
- A tall dandelion-like flower, covered in bristles.
- Leaves have large bumps on them.
- Lots of seed in the fall - you'll see it blowing in the air.
- Not CA native.
- Somewhat Invasive
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Leaves have stiff bristles and bumps, giving it its name. Dandelion-like flowers top each branch.
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Dandelion-like flowers are surrounded by distinctive, triangular, upward pointing, bristly green bracts.
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Plants are tall, with many branches.
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Brittle Leaf Manzanita
Arctostaphylos crustacea
- Height 3 - 10 ft.
- CA Bloom Jan - Mar
- Leaves stick out from the hairy stem.
- Alternate leaves dark green above, and light green below.
- Big bunches of tiny flowers, hanging down from pedicels.
- Fruit red, spherical with flat spot. Not sticky.
- CA native
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Leaves are big - about 2 inches long. Clusters of tiny white flowers.
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Prominent burl at the base of the plant.
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Grows to 8 feet, generally in the fog belt.
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Brittle Leaf Manzanita (1)
Arctostaphylos crustacea ssp. crustacea
- Height 3 - 10 ft.
- CA Bloom Jan - Mar
- Leaves stick out from the hairy stem.
- Alternate leaves dark green above, and light green below.
- Big bunches of tiny flowers, hanging down from stalk-like pedicels.
- Fruit is red and spherical with flat spot. Not sticky.
- CA native
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Leaves are relatively big (2" long). Flowers are tiny in large bunches.
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Early flower development shows red bracts. Leaves of ssp. crustacea have almost no hair on the bottom.
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Look for a prominent burl at the base of the plant.
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Broad Leaf Lupine
Lupinus latifolius var. latifolius
- This perennial has an erect stem up to 4 feet tall.
- CA Bloom Apr - May
- Blue and purple flowers have a white banner spot that ages to magenta.
- Found in dry rocky areas, this plant needs some shade and seasonal moisture.
- CA native
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The inflorescence can get really tall - up to 2 feet long. Flowers have an open arrangement.
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Broad Leaf Lupine has broad leaves. They feel rubbery on top and slick underneath.
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Leaves (up to 4" for each finger on stalks up to 8" long) dwarf the individual 1/2" flowers.
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Broadfruit Bur Reed
Sparganium eurycarpum
CA Bloom Jun - Jul
Black, brown, green, pink, white, yellow flower
Tiny petals
Alternate leaves
CA native
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Brome Fescue
Festuca bromoides
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Brome Fescue is a short grass with small spikelets that turn a straw-like color as they age. Fescue is Latin for "straw".
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Each floret produces an awn about the length of the rest of the spikelet.
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The inflorescence is densely populated with spikelets on short stalks. Spikelets and awns point sideways as they mature, giving a tangled appearance.
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Bulbous Blue Grass
Poa bulbosa
- Perennial 6-24"
- Inflorescence branched 1-4"
- No awns
- CA Bloom May - Jun
- Stems have a bulbous section at their base that can break off to form a new plant.
- Some plants have bi-sexual florets. Others have aerial bulblets that are self pollinated.
- Not CA native
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Most California plants have self-pollinated aerial bulblets with shoots already growing out of them.
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The base of the stem also has bulblets that divide to create new plants.
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This weedy bluegrass can dominate roadsides, overgrazed pastures and other disturbed areas.
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Bull Thistle
Cirsium vulgare
- CA Bloom June - Sept
- This thistle has spiny everything.
- A pear-shaped spiny base supports a 2-inch-tall purple flower.
- Dead flowers with many spines stay on the plant for a long time.
- Bull Thistle is common in disturbed areas.
- Not CA native.
- Moderately Invasive
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A fairly thin pear-shaped spiny bulge below flower is a good way to distinguish this species.
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Bull Thistle has big spines all the way up the stem, on the leaves, and around the flower.
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Here is a basal rosette of thick, toothed leaves.
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Bur Reed
Sparganium eurycarpum var. greenei
CA Bloom Jun - Jul
Black, brown, green, pink, white, yellow flower
Tiny petals
Alternate leaves
CA native
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California Aster
Symphyotrichum chilense
CA Bloom Jul - Aug
Blue, pink, violet, white flower
Many petals
Alternate leaves
CA native
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California Aster (1)
Corethrogyne filaginifolia
CA Bloom Jun - Oct
Pink, violet, white flower
Many petals
Alternate leaves
Dunes coastal
CA native
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California Bay Laurel
Umbellularia californica
- CA Bloom Nov - May
- Height to 60 feet.
- The foliage of this classic California tree smells like bay leaves.
- Clusters of small flowers grow at the end of branches where new leaves emerge.
- Flowers turn into a plump 1 inch fruit resembling avocados, to which the tree is related.
- CA Native - endemic to the California Floristic Province.
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Leaves are fairly narrow, with a central vein and smooth edges, ending in a point. They have a leathery feel, and a spicy smell when crushed.
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Green fruit turns purple when mature. Leathery skin covers oily flesh that surrounds a pit (similar to avocado).
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Bay Laurels can grow to be substantial trees, thickly covered with their spicy-smelling leaves.
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California Bedstraw
Galium californicum
CA Bloom Mar - Sep
Yellow flower
Four petals
Whorled leaves
CA native
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California Blackberry
Rubus ursinus
- Height 3 - 6 ft.
- CA Bloom Feb - May
- This shrub forms an impenetrable thicket of branches, full of narrow prickles.
- You'll notice bright white flowers with many stamens.
- Found in canyons, coastal stream banks and disturbed areas
- CA native
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Separate petals, with green leafy sepals in between. This male flower has many stamens.
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Prickles are short, narrow, and plentiful. Himalayan Blackberry has wider, longer, and less densely-packed prickles.
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Red fruit turns black with maturity. Leaves in 3s, coarsely toothed, are hairy and have spines. Veins are indented on the leaves.
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California Brome
Bromus sitchensis var. carinatus
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Spikelets attach to the stem on branches. Glumes are short, revealing 5-10 florets above them.
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Florets form a flat, woven pattern, each with a 1/2" awn.
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Long leaves and inflorescences give this a classic bunch grass look.
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California Buckeye
Aesculus californica
- Height 12 - 40 ft.
- CA Bloom May - Jul
- Buckeye trees are conspicuous from afar; pale green leaves in early spring, full of flowers in early summer, and bare-branched well before other trees lose their leaves in the fall.
- Each aromatic flower has 4 pink or white petals and long stamens.
- The fruit resembles a buck's eye - brown and about 2 inches across.
- CA native
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Buckeye trees become covered with columns of sweet-smelling flowers.
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5-part compound leaves are palmate (shaped like a hand). Leaf edges are finely-toothed and bud in early February.
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Trees in the open form a dome shape, often growing 40 feet tall and 40 feet wide. They can live 250 years.
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