Ceanothus sonomensis

J. T. Howell Leafl. W. Bot. 2: 162. 1939

Sonoma ceanothus


Habit: Shrubs to 1.2 m.

Stems: erect, not rooting at nodes; twigs gray to brown, round, smooth, glabrous, rigid.

Leaves: evergreen, opposite; not clustered; stipules thickened, persistent; petioles 0--1 mm; blade cuneate-obovate to orbicular, 0.8--1.5 x 0.3--1.0 cm, bases cuneate, 1-veined, margins not revolute, with 4--8 +/- spine-like teeth, may be undulate, tips notched; abaxially gray, short-tomentose, adaxially shiny green, glabrous, plane.

Inflorescences: axillary, umbel-like, to 2.8 cm.

Flowers: blue to lavender.

Fruits: globose, 5 mm broad, smooth, horns slender, on shoulder; valve crests minute.

Cytology: 2 n = 24 (M.A. Nobs, 1963)

Flowering: in spring.

Habitat: chaparral on sandy, serpentinite or volcanic soils; under 800 m.

Range: Calif. [NCoRO (Mt.Hood Mt Range, Sonoma and Napa Cos.)] RARE View Distribution Map.

Other Information:

California Native Plant Society List: 1B R-E-D Code: 3-2-3 State/Fed. Status: /C2; known from only a few sites and seriously threatened by development. [M. W. Skinner and B. M. Pavlik 1994]

If you have any comments or information regarding this species, please send mail to Dr. Schmidt.

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This document was last updated: Thursday, 29-Feb-1996 16:53:05 PST