Diablo Foothills Regional Park

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         (463 plants)
Thanks to the East Bay Regional Parks for this list.

    
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



Flowers dark brown with tan bristles.

Flowers group in the joint of flat stems.

Stands erect with noticeable brown flowers
American Brooklime
Veronica americana
  • Height to 1 ft.
  • CA Bloom Jul - Aug
  • Blue or violet 4-petaled flowers
  • Opposite leaves
  • Round stems
  • Grows in fresh-water wetlands, such as stream banks
  • Stem runs along the ground, up to 2 feet long.
  • CA native



Look for 4 petals and opposite leaves with a round stem. Green center guides in pollinators.

4 pale-blue petals with 4 green sepals behind them.

Opposite leaves up to 3 inches long. Flowers in groups at the end of stalks.
American Vetch
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



Small but bright flowers

Lots of small compound leaflets.

Long thin leaves and purple flowers make this a vetch.
Annual Beard Grass
Polypogon monspeliensis

Annual Beard Grass is topped by large, fluffy spikes. They're framed by flat, rough, green leaves to 8" long.

Soft, dense spikelets are green until they mature. There are lots of spikelets in the spike, each producing 3 awns.

Long awns let light through around the edge but the center is opaque.
Annual Blue Grass
Poa annua


Bright green or yellow-green leaves are soft, generally flat and come to a blunt point at the tips.

Like all Bluegrasses, the inflorescence is open and spikelets have no awns. Florets are membranous.

Annual Blue Grass grows quickly in disturbed areas. Plants are small but have many leaves.
Annual June Grass, Bristly Koeleria
Koeleria gerardii
  • CA Bloom Apr - Jul
  • Not CA native




  • Annual Stinging Nettle
    Urtica urens
    • CA Bloom Jan - Apr
    • Also called Dwarf Nettle, this plant grows to about 2 feet tall.
    • Stinging nettles, in general, produce a stinging sensation when touched. However, EFlora says that this specie's sting is not very strong.
    • Found in shady areas.
    • Not CA native



    Leaves are hairy, dark green, have large teeth, and end in a point.

    Leaves are opposite. Veins make indentations in the leaves.

    Small green flowers look like little balls.
    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



    Look for radial leaflets that are wider near the tip. Their fleshy top feels rubbery.

    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.

    Stacks of whorled flowers have white banner spots that turn magenta with age.
    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.



    Leaves are about 5 inches long, smooth-sided and narrow. They're pale/hairy underneath, and wider near the tip than near the base.

    Classic pussies with yellow stamens. The buds are fused together (not overlapping) before they open.

    This willow has many trunks, sometimes growing as a tree, and sometimes as a tangled shrub.
    Australian Brass Buttons
    Cotula australis
    • CA Bloom Jan - May
    • A small plant that grows low to the ground.
    • Many tiny flowers form a yellow "Button".
    • Flowers have no petals.
    • Leaves are finely divided.
    • Grows in disturbed places
    • Not CA native



    Small flower head is made up of many tiny petal-less flowers.

    Leaves divide into many little lobes. Grows low to the ground.

    Green phyllaries behind a yellow flower head.
    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


    Composite flowers group at the top of the stem. They have no "petals" ( ray flowers).

    Leaves clasp the stem, grow to about 6 inches, and are deeply lobed.

    Grows to 6 feet or so, with lots of flowers near the top of the stem.
    Bearded Clover
    Trifolium barbigerum
    • Height to 1 ft.
    • CA Bloom Feb - May
    • Brown, pink, violet, white flower
    • Irreg petals
    • Alternate leaves
    • CA native




    Bearded Sprangletop
    Leptochloa fusca ssp. fascicularis
  • CA Bloom Jun - Oct
  • CA native




  • Beardless Wild Rye
    Elymus triticoides


    This rye has 2-ranked spikelets that connect directly to the stem. There is space between each alternating spikelet.

    Hollow stems (like straws) connect at solid joints. Leaves are about 1/4" wide and a foot long.

    Prominent blue-green leaves are 4-12" long and grow away from the stem. Found in moist habitats with heavy soils.
    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



    This view of the flower from below shows two rounded petals on top, two side petals, and one folded out like a tongue.

    A square stem supports large, opposite, toothed leaves. This might make you think "Mint" but it's not.

    Bee Plant grows several feet high with opposite, narrow leaves sticking straight out. Flowers are on horizontal stalks near the top.
    Bermuda Grass
    Cynodon dactylon

    Spikelets are tiny (<1/10") and purple. Tight colonies of plants are connected by rhizomes and stolons.

    Two rows of spikelets connect to one side of finger-like branches that all join at the top of the stem.

    The ligule is white and hairy. Leaf blades are short, flat and fleshy.
    Big Leaf Mistletoe
    Phoradendron leucarpum ssp. macrophyllum
  • Shrub
  • Green flower
  • Tiny petals
  • Opposite leaves
  • CA native




  • Big Scale Balsam Root
    Balsamorhiza macrolepis
  • CA Bloom Mar - Jun
  • Yellow flower
  • Many petals
  • Basal leaves
  • Slopes
  • CA native
  • Endangered (CNPS 1B)




  • Big Tarweed
    Blepharizonia plumosa
  • CA Bloom Jul - Oct
  • CA native
  • Endangered (CNPS 1B)




  • Big-Leaf Maple
    Acer macrophyllum
    • Height 50 - 100 ft.
    • CA Bloom Apr - May
    • You'll probably notice the maple leaves first; they're large and grow opposite each other.
    • Leaves are green in the summer, yellow in the fall, and absent in the winter.
    • In spring, small greenish-yellow flowers hang in clusters below newly emerging leaves.
    • Big Leaf Maples do well near water and in dappled shade.
    • CA native



    Leaves are quite large, up to 12" wide, with deep indents. No other maple in the U.S. has leaves this big.

    Flower clusters droop from emerging leaves.

    Two winged fruits grow side by side, creating a helicopter-like lift when they're blown away on the wind.
    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



    Shiny papery phyllaries surround tiny yellow aster flowers.

    Many tiny brown fruits.

    Grows to 3 feet, sometimes woody at the base.
    Bird's Eye Speedwell
    Veronica persica
    • Height 4 in. - 1 ft.
    • CA Bloom Feb - May
    • This is a small, beautifully marked wildflower.
    • Leaves are opposite and small, often with serrated edges.
    • It's found in disturbed areas, often near agriculture.
    • Not CA native



    The small (1/4"), 4-petaled flower has darker blue, radiant stripes. Notice how the petal sizes vary. 2 purple-tipped stamens and a green tinged center invite pollinators to visit.

    Leaves are opposite. Flowers cluster at the top of the stem. The plant is often recumbent, lying along the ground.

    This beautiful plant is easy to overlook because of its small size, but a pleasure to find.
    Bird's Foot Lotus
    Acmispon brachycarpus
    • Height 6 in. - 1 ft.
    • CA Bloom Mar - Jun
    • Yellow flower
    • Pea petals
    • Alternate leaves
    • CA native




    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



    Tiny pea flowers cluster at the end of the stem.

    Each plant is small. See fruit pods on the left, compound leaves in the middle, and a flower cluster on the right.

    Colonies of Bird's Foot Trefoil can be prominent in grasslands. It is sometimes vine-like, with prostrate stems up to 20 inches.
    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



    Leaf tops are glossy dark-green. Undersides are pale. Leaves are long and pointed, with small teeth on the edge.

    Alternating secondary veins connect to a central one.

    Grows near running water. Trunks get very large, and the tree height often exceeds 100 feet.
    Black Locust
    Robinia pseudoacacia
  • CA Bloom Mar - Jun
  • White flower
  • Pea petals
  • Alternate leaves
  • Not CA native
  • Somewhat Invasive




  • Black Mustard
    Brassica nigra
  • CA Bloom Apr - Jul
  • Yellow flower
  • Four petals
  • Alternate leaves
  • Not CA native
  • Moderately Invasive




  • Black Sage
    Salvia mellifera
  • CA Bloom Mar - Jul
  • Violet, white flower
  • Irreg petals
  • Opposite leaves
  • CA native


  • Mint flowers and leaves in whorls around the stem.

    Seed groups s become woody.

    Basal leaves much longer than wide, with a strong central vein. Flowers in whorls around the upper stem.
    Blow Wives
    Achyrachaena mollis
    • Height 2 in. - 2 ft.
    • CA Bloom Apr - May
    • This eye-catching bright-white flower is not a flower at all. As you look closer, you'll see that the "petals" are actually the flat scales of a seed head.
    • A California endemic, this plant grows natively nowhere else in the world.



    Here is the classic Blow Wives look. Flat, scaly pappus forms a wind parachute for each seed.

    Yellow or orange ray florets point straight up. Inside them, many disc florets grow without petal-like rays.

    Leaves are narrow and grow up to 6" long. They're erect and fuzzy.
    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



    A tight bunch of 6-petaled flowers appears at the top of a tall, wavy stalk.

    The centers of the flowers feature a forked, white sheath that surrounds yellow-tipped stamens.

    Long, narrow leaves grow from the base of the plant. Below, the roots connect to food-storing corms.
    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



    White flat-topped clusters of flowers are easy to spot.

    Berries with a waxy covering makes them look powdery.

    Compound leaves with 5 - 9 toothed leaflets.
    Blue Oak
    Quercus douglasii
    • Height 20 - 65 ft.
    • CA Bloom Mar - May
    • Blue-green leaves with wavy edges, plus corn flake bark, are quick way to identify this oak.
    • Leaves are relatively small and sparse, allowing it to tolerate more sun and dryer places than other California deciduous oaks.
    • CA native. Found only in California.



    Leathery blue-green leaves often have shallow lobes. They have a short petiole (stalk) and are generally 2 - 3 inches long.

    Bark is pale and checkered by medium-size cracks. It reminds me of corn flakes.

    This moderately sized oak has a heavy trunk and branches. It's common in dry, hot places that have some water.
    Blue Witch
    Solanum umbelliferum
    • CA Bloom Jan - Jun
    • Look for a pentagon-shaped flower with a bright yellow center.
    • Branches and leaves are quite hairy.
    • Green fruits turn purple when ripe.
    • This distinctive shrub is widespread in chaparral and oak woodlands.
    • CA native



    Blue Witch flowers are lavender or blue, pentagon-shaped, and have a yellow center.

    Leaves are hairy and smooth edged. Flowers sport green spots at the base of their petals.

    Blue Witch is a small shrub that grows to 3 feet. Every part of it is poisonous to eat.
    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.



    Beautiful 1/2" wide flowers have blue to violet petals and a golden yellow center to guide pollinators in.

    Leaves are grass-like, narrow with parallel veins.

    The ovary is below the flower and, if pollinated, develops into a capsule-like fruit.
    Bog Yellowcress
    Rorippa palustris ssp. palustris
  • CA Bloom Apr - Jun
  • Yellow flower
  • Four petals
  • Alternate leaves
  • CA native




  • Box Elder
    Acer negundo
    • Height 25 - 66 ft.
    • CA Bloom Feb - Mar
    • Opposite leaves
    • Streambanks
    • CA native




    Branched Indian Clover
    Trifolium dichotomum
  • CA Bloom Mar - May
  • Black, brown, pink, white flower
  • Irreg petals
  • Alternate leaves
  • CA native




  • Branching Phacelia
    Phacelia ramosissima
  • CA Bloom May - Aug
  • Violet, white flower
  • Five petals
  • Alternate leaves
  • Coastal
  • CA native




  • Brass Buttons
    Cotula coronopifolia
  • CA Bloom May - Oct
  • Green, yellow flower
  • Tiny petals
  • Alternate leaves
  • Not CA native
  • Somewhat Invasive




  • Brewer's Ragwort
    Packera breweri
  • CA Bloom Apr - May
  • Yellow flower
  • Many petals
  • Alternate, basal leaves
  • Slopes
  • CA native




  • Brewer's Rock Cress
    Boechera breweri
  • CA Bloom Feb - May
  • Violet flower
  • Four petals
  • Alternate, basal leaves
  • Slopes
  • CA native




  • Brewer's Rockcress
    Boechera breweri ssp. breweri
  • CA Bloom Feb - May
  • Violet flower
  • Four petals
  • Alternate, basal leaves
  • CA native




  • Brewer's Saltbrush
    Atriplex lentiformis
  • CA Bloom Jun - Jul
  • Yellow flower
  • Tiny petals
  • Alternate leaves
  • Coastal salt-marsh
  • CA native




  • Bristly Linanthus
    Leptosiphon aureus
  • CA Bloom Mar - Jun
  • Pink, white, yellow flower
  • Five petals
  • Opposite leaves
  • CA native
  • Uncommon (CNPS 4)




  • 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


    Leaves have stiff bristles and bumps, giving it its name. Dandelion-like flowers top each branch.

    Dandelion-like flowers are surrounded by distinctive, triangular, upward pointing, bristly green bracts.

    Plants are tall, with many branches.
    Brittle Leaf Manzanita
    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



    Leaves are relatively big (2" long). Flowers are tiny in large bunches.

    Early flower development shows red bracts. Leaves of ssp. crustacea have almost no hair on the bottom.

    Look for a prominent burl at the base of the plant.
    Broadfruit Bur Reed
    Sparganium eurycarpum
  • CA Bloom Jun - Jul
  • Black, brown, green, pink, white, yellow flower
  • Tiny petals
  • Alternate leaves
  • CA native




  • Brome Fescue
    Festuca bromoides


    Brome Fescue is a short grass with small spikelets that turn a straw-like color as they age. Fescue is Latin for "straw".

    Each floret produces an awn about the length of the rest of the spikelet.

    The inflorescence is densely populated with spikelets on short stalks. Spikelets and awns point sideways as they mature, giving a tangled appearance.
    Brown Cyperus
    Cyperus niger
  • CA Bloom Jul - Nov
  • Meadows
  • CA native




  • Brown Dogwood
    Cornus glabrata
  • CA Bloom May - Jun
  • White flower
  • Four petals
  • Opposite leaves
  • CA native




  • 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



    Most California plants have self-pollinated aerial bulblets with shoots already growing out of them.

    The base of the stem also has bulblets that divide to create new plants.

    This weedy bluegrass can dominate roadsides, overgrazed pastures and other disturbed areas.
    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


    A fairly thin pear-shaped spiny bulge below flower is a good way to distinguish this species.

    Bull Thistle has big spines all the way up the stem, on the leaves, and around the flower.

    Here is a basal rosette of thick, toothed leaves.
    Bur Chevril
    Anthriscus caucalis
    • Height 2 - 3 ft.
    • CA Bloom Mar - May
    • White flower
    • Five petals
    • Alternate leaves
    • Disturbed
    • Not CA native




    Bur Reed
    Sparganium eurycarpum var. greenei
  • CA Bloom Jun - Jul
  • Black, brown, green, pink, white, yellow flower
  • Tiny petals
  • Alternate leaves
  • CA native




  • Butter And Eggs
    Triphysaria eriantha
  • CA Bloom Feb - Apr
  • Pink, white, yellow flower
  • Three petals
  • Alternate leaves
  • CA native




  • Butterfly Mariposa Lily
    Calochortus venustus
  • CA Bloom May - Jun
  • Pink, red, violet, white, yellow flower
  • Three petals
  • Alternate leaves
  • CA native




  • California Aster
    Symphyotrichum chilense
  • CA Bloom Jul - Aug
  • Blue, pink, violet, white flower
  • Many petals
  • Alternate leaves
  • CA native




  • California Aster (1)
    Corethrogyne filaginifolia
  • CA Bloom Jun - Oct
  • Pink, violet, white flower
  • Many petals
  • Alternate leaves
  • Dunes coastal
  • CA native




  • 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.



    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.

    Green fruit turns purple when mature. Leathery skin covers oily flesh that surrounds a pit (similar to avocado).

    Bay Laurels can grow to be substantial trees, thickly covered with their spicy-smelling leaves.
    California Bedstraw
    Galium californicum
  • CA Bloom Mar - Sep
  • Yellow flower
  • Four petals
  • Whorled leaves
  • CA native