Ceanothus foliosus

C. C. Parry, Proc.Davenport Acad. Nat. Sci. 5: 172. 1889


Description:

Habit: Shrubs 0.3--2.5 (3.0) m.

Stems: procumbent, low spreading, erect-spreading and arching, or erect, not rooting at nodes; twigs +/- pale green, round, smooth or slightly ridged, often glandular-hairy, flexible.

Leaves: evergreen, alternate; not clustered; stipules thin, deciduous; petioles to 3 mm; blades narrowly oblong-elliptic, narrow to broadly elliptic or obovate, 0.5--2.0 x 0.3--1.3 cm, bases cuneate, obtuse or rounded, usually 1-veined o r faintly 3-veined, margins not revolute, usually glandular-denticulate, sometime with few glands, tips obtuse, abaxially pale greenish-gray, dark green or gray, +/- glabrous, hairy on veins, or densely pubescent, adaxially dark green, glabrous, waxy or p uberulent, +/- plane, undulate or occasionally troughed.

Inflorescences: axillary, usually raceme-like, 0.5--2.5 (7.5) cm.

Flowers: pale blue--dark blue.

Fruits: subglobose, +/- lobed, +/- 4 mm broad, smooth, horns 0; valves +/- crested.


Varieties 3:

(3 in the flora): Calif.

1. Leaf blades densely hairy on and between veins adaxially: b. C.foliosus var. medius.

1.Leaf blades glabrous or with few, scattered hairs between veins adaxially.

2. Leaf blades oblong-elliptic, margins glandular-denticulate: a. C.foliosus var. foliosus.


2. Leaf blades broadly elliptic to obovate, margins nearly plane, glands frequently few: c. C.foliosus var. vineatus.


a. Ceanothus foliosus C. C. Parry var. foliosus

wavyleaf ceanothus

C. austromontanus, L. Abrams; C. dentatus J. Torrey & A. Gray var. dickeyi F.R. Fosberg; Ceanothus diversifolius A. Kellogg var. foliosus (C.C. Parry) K. Brandegee

Description:

Habit: usually under 1 (3.5) m.

Stems: procumbent, low spreading, erect-spreading or erect, not rooting at nodes; twigs +/- pale green, often glandular-hairy, flexible.

Leaves: evergreen, alternate; stipules thin, deciduous; petioles to 3 mm; blades narrowly oblong-elliptic, 0.5--2.0 x 0.3--1.3 cm, bases obtuse, usually 1-veined or faintly 3-veined, tips obtuse, margins usually glandular-denticulate, ab axially pale greenish-gray, +/- glabrous to hairy on veins, adaxially dull to dark green, microscopically hairy, waxy or glabrous, plane, frequently undulate, occasionally troughed.

Inflorescences: axillary, usually raceme-like, 0.5--2.5 cm.

Flowers: pale blue--dark blue.

Fruits: subglobose, +/- 4 mm broad, smooth, horns 0; valves +/- crested.

Cytology: n = 12 (M.A. Nobs in McMinn 1942

Habitat: dry, rocky, brushy slopes; 100--1500 m.

Flowering: in spring--early summer.

Range: Calif. [NCoRO, SnFrB, SCoR, PR]. View Distribution Map.


OTHER INFORMATION: Shrubs from North San Francisco Bay, Calif. with leaf blades less than 1.0 cm long, very undulate, distinctly glandular-waxy adaxially are a minor variation [H. McMinn 1942], (sheet 59588 ORE now in OSC).


b. Ceanothus foliosus var. medius H. McMinn

Ceanothus 2: 222. 1942

La-Cuesta-ceanothus

Description:

Habit: Shrubs to 2 m.

Stems: erect, branches somewhat arching; twigs +/- pale green, round, often glandular-hairy, flexible.

Leaves: evergreen, alternate; stipules thin, deciduous; petioles to 3 mm; blades narrow to broadly elliptic, 1.0--2.0 x 0.3--1.3 cm, bases obtuse, usually 1-veined or faintly 3-veined, tips obtuse, margins glandular-denticulate, abaxially gray, densely pubescent, adaxially dull green, glandular hairy, +/- plane.

Inflorescences: axillary, usually raceme-like, 0.5--2.5 cm.

Flowers: pale--dark blue.

Fruits: subglobose, +/- 4 mm broad, smooth, horns 0; valves +/- crested.

Cytology:

Habitat: Chaparral; below 650 m.

Flowering: Calif. [SnFrB, SCoR (Santa Clara, Monterey, San Luis Obispo Cos.]

Range: View Distribution Map.


c. Ceanothus foliosus var. vineatus H. McMinn

Ceanothus 2: 221. 1942

Vine-Hill-ceanothus

Description:

Habit:Shrubs to 0.8 m.

Stems: +/- procumbent to erect-spreading and arching; twigs +/- pale green, round, often glandular-hairy, flexible.

Leaves: evergreen, alternate; stipules thin, deciduous; petioles to 3 mm; blades broadly elliptic to obovate, 1.2--2.0 x 0.7--1.3 cm, bases obtuse, usually 1-veined or faintly 3-veined, tips obtuse, margins with few glands, abaxially pal e green, hairs scattered on veins, fewer between, adaxially dark green, hairs sparse, +/- plane.

Inflorescences: axillary, usually raceme-like, 1.3--7.5 cm.

Flowers: dark blue.

Fruits: subglobose, +/- 4 mm broad, smooth, horns 0; valves +/- crested.

Cytology:

Habitat: chaparral, dry, rolling hills; below 300 m.

Flowering: in spring--early summer.

Range: Calif. [NCoRO (Sonoma & Mendocino Cos.)] View Distribution Map.

Other Information:

California Native Plant Society List: 1B; R-E-D Code: 3-3-3; State/Fed. Status: /C2 Nearly eradicated in Sonoma Co., CA; "...now confirmed from only one native population. Known from one historical occurrence in Mend ocino Co., CA, but unable to relocate..." [Skinner, M. W. and B. M. Pavlik, eds. 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: Sunday, 10-Mar-1996 22:42:59 PST

schmidtc@bcc.orst.edu