Temescal Regional Recreation Area

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         (359 plants)
Thanks to the East Bay Regional Park District 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
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



Tiny flowers on leafless wispy stems about 2 feet tall.

Leaves connect to the base of the plant on long stalks. They're fuzzy and roundish.

Leaves form a thick basal cluster, with tiny flowers appearing to be suspended in air above them.
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



Opposite leaves, strong veins, pointed tips.

Showy clumps of flowers turn into white berries.

4-petaled white flowers grow in clumps at the end of stems.
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



Purple pea-like flowers

Alternate compound leaves.

Vine grows to a foot long. One inch pea pods for fruit.
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



Small but bright flowers

Lots of small compound leaflets.

Long thin leaves and purple flowers make this a vetch.
Andean Pampas Grass
Cortaderia jubata

Tall stems (up to 20 feet) and showy tops make this plant stand out.

Many stems join at the root.

Grass stem is hairy. Leaves connect to the stem in a sheath.
Annual June Grass, Bristly Koeleria
Koeleria gerardii
  • CA Bloom Apr - Jul
  • Not CA native




  • 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.
    Baby's Tears
    Soleirolia soleirolii
  • CA Bloom Mar - Jun
  • White flower
  • Tiny petals
  • Not CA native




  • Beaked Hazelnut
    Corylus cornuta
  • CA Bloom Feb - Mar
  • Tiny petals
  • Alternate leaves
  • Streambanks slopes
  • CA native




  • 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.
    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.
    Birch Leaf Mountain Mahogany
    Cercocarpus betuloides var. betuloides
    • CA Bloom Mar - May
    • Lots of small white flowers in clusters, with a mild scent.
    • Five petals
    • Alternate leaves are smooth at the base and toothed above, with distinct veins.
    • CA native



    Leaves have smooth edges near the base, but become toothed about half way up. Rounded tips.

    Fruit shaped like a fuzzy twisted tail.

    Shrub grows 3 to 20 feet tall, on dry slopes.
    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.
    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



    Blueblossom is full of tiny, fragrant flowers when it blooms in spring.

    Alternate leaves have 3 veins that join at the base. The underside is dull and the top is shiny.

    Leaves are shiny and dark green on top, growing to 2 inches long. They have glandular bumps on the side.
    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 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


    Flower has many white stamens surrounding a central knob, and smells of honey.

    Mature leaves are narrow and curved, growing to a foot long. Woody fruits with 5 notches, grow to 1 inch across.

    Heavy trunks with bark that peals in large strips.
    Blue Violet, Western Dog Violet
    Viola adunca ssp. adunca
    • CA Bloom Apr - Aug
    • Purple violet-shaped flower.
    • Low to the ground with spade or heart shaped leaves.
    • Found in meadows and forests through North America.
    • CA native



    Nodding flower with violet-shaped purple petals.

    Lower petal has white base and purple veining. Side petals have white hairs near the center.

    Leaves spade or heart shaped.
    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.
    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




    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



    Bracken Fern frond segments are long at the base and quite short near the top, creating an overall triangle shape.

    Segments have regular rounded lobes. The similar Sword Fern has a "thumb" near its midrib.

    New growth forms in a fiddlehead, and then opens up.
    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




  • 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.
    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 Mallow
    Malva nicaeensis
  • CA Bloom Mar - May
  • Pink, violet, white flower
  • Five petals
  • Alternate leaves
  • Disturbed
  • Not CA native




  • 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




  • 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 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



    Separate petals, with green leafy sepals in between. This male flower has many stamens.

    Prickles are short, narrow, and plentiful. Himalayan Blackberry has wider, longer, and less densely-packed prickles.

    Red fruit turns black with maturity. Leaves in 3s, coarsely toothed, are hairy and have spines. Veins are indented on the leaves.
    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



    Buckeye trees become covered with columns of sweet-smelling flowers.

    5-part compound leaves are palmate (shaped like a hand). Leaf edges are finely-toothed and bud in early February.

    Trees in the open form a dome shape, often growing 40 feet tall and 40 feet wide. They can live 250 years.
    California Bulrush
    Schoenoplectus californicus
  • CA Bloom May - Jun
  • Freshwater-marsh
  • CA native




  • California Cottonrose
    Logfia filaginoides
  • CA Bloom Mar - Jun
  • Green flower
  • Tiny petals
  • Alternate leaves
  • CA native




  • California Cudweed
    Pseudognaphalium californicum


    Each tiny pineapple-shaped flower head is wrapped in white papery phyllaries and contains over 100 minute yellow flowers.

    Leaves are narrow and pointed, growing to 4 inches long. They're smaller higher on the stem.

    Branching stems grow erect, each topped with whitish flower heads.
    California Four O'clock
    Mirabilis laevis var. crassifolia
  • CA Bloom Dec - Jun
  • Pink, white flower
  • Five petals
  • Opposite leaves
  • CA native




  • California Goldenrod
    Solidago velutina ssp. californica
  • CA Bloom Jul - Oct
  • Yellow flower
  • Many petals
  • Alternate leaves
  • CA native




  • California Hazelnut
    Corylus cornuta ssp. californica
    • CA Bloom Jan - Mar
    • This shrub has open branching, and grows to 10 feet.
    • Leaves are soft, alternate, and deeply veined.
    • The stem changes direction at each leaf node.
    • Found on stream banks and slopes
    • CA native



    Soft fuzzy leaves have toothed edges. Veins are indented. Leaves fall off in the winter.

    The flower matures to a hazelnut, protected by a hard shell and fuzzy sheath.

    Male catkins form in the fall and last until spring.
    California Honeysuckle
    Lonicera hispidula
    • CA Bloom Apr - Jul
    • This is a woody vine that can climb 30 feet into trees. You'll notice them hanging down from branches.
    • Vines end in pink trumpet flowers whose lips fold back to reveal long stamens.
    • Common in canyons, stream sides and woodlands, especially near the coast.
    • CA native. Endemic to the California Floristic Province.



    Vines end in pink flowers, full of nectar (thus, Honeysuckle). Hummingbird and bees pollinate the flowers in their search for the nectar.

    Pollinated flowers turn into bright-red translucent berries.

    Leaves near the flower wrap around the stem. Leaves further down are opposite.
    California Mustard
    Caulanthus lasiophyllus
    • CA Bloom Mar - Jun
    • Flowers with 4 widely-separated petals mark this as a Mustard Family plant.
    • It's smaller in stature than our vigorous non-native mustards.
    • CA native



    Compared to our non-native mustards, California Mustard has fewer, smaller, generally white flowers.

    Seed pods are quite narrow and long.

    The whole plant gives a linear apearance.