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Flora of Scotts Creek Watershed

Full Full2 Flowered Branch Branch Tip Flower Closeup Green Bark

Ceanothus thyrsiflorus - Blue Blossom Ceanothus

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Family Name: Rhamnaceae

Common Names: Blue Blossom Ceanothus, Blue Brush, Blue-Blossom

Origin: Native to California

Habitat: Forests, woodlands, and coastal scrubs of N. CA's coast ranges, below 2000 ft.

Life Form and Duration: Perennial Shrub, up to 6 m tall.

Comments on overall growth: Prostrate to erect, may be tree-like.

Bark and Stem Description: Twigs are ribbed, hairless, flexible, green becoming darker with age.

Foliage Type: Evergreen

Foliage Description: Alternate, deciduous stipules, blades oblong-ovate to widely elliptic, less than 5 cm long, finely serrated margins, 3 prominent mid veins from base towards leaf tip visible, upper surface dark green and glabrous, lower surface paler green and sparse-hairy on veins.

Infloresence Description: Narrow flower clusters, dense, raceme or panicle like, shorter in length than 8 cm.

Flower Description: Flowers light (almost white) to deep blue. 5-merous, radial, small ~ 5 mm across, petals long clawed.

Flowering Season: March-August

Fruit Type: Capsule

Fruit Description: Spherical, sticky, slightly lobed, ~ 3 mm in diameter.