Flora of Scotts Creek Watershed
Ceanothus thyrsiflorus - Blue Blossom Ceanothus
Images: View Larger Images
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.