Ceanothus papillosus

J. Torrey & A. Gray, Fl. N. Amer. 1: 268. 1838


Description:

Habit: Shrub to 4.5 m.

Stems: spreading-erect, sprawling or nearly prostrate, not rooting at nodes; twigs olive green, round, slightly roughened, densely tomentose, flexible.

Leaves: evergreen alternate; +/- crowded; stipules thin, deciduous; petioles +/- 3 mm; blades linear, narrowly oblong, elliptic, or oblong-elliptic, 1.3--5.0 x 0.6--1.6 cm, bases rounded, 1-veined, margins usually revolute, minutely glan d-toothed, tips rounded, truncate to notched, abaxially pale green, cobwebby, usually densely hairy, adaxially dark green, +/- hairy, glandular-papillate, slightly convex.

Inflorescences: axillary, usually raceme-like, 2.0--5.0 cm.

Flowers: deep blue.

Fruits: trihedral, +/- 3 mm broad, smooth, horns 0; valve crests minute.


Varieties: (2 in the flora): North America

1. Shrubs spreading-erect, to 4.5 m. Leaf-blades 1.0--1.6 cm wide, tips rounded or obtuse to tuncate, not notched: a.Ceanothus papillosus var. papillosus

1. Shrubs spreading-erect, sprawling or nearly prostrate, to 1.8 m. Leaf-blades, linear to oblong, less than 1 cm wide, tips truncate or notched: b. Ceanothus papillosus var. roweanus


a. Ceanothus papillosus

J. Torrey & A. Gray var. papillosus

wartleaf ceanothus

Ceanothus dentatus J. Torrey & A. Gray var. papillosus K. Brandegee

Description:

Habit: Shrub to 4.5 m.

Stems: spreading-erect; twigs olive green, in age darkening, round, densely tomentose, slightly roughened, flexible.

Leaves: evergreen alternate, +/- crowded; stipules thin, deciduous; petioles c. 3 mm; blades elliptic, or oblong-elliptic, 1.3--5.0 x 1.0--1.6 cm, bases rounded, 1-veined, margins +/- revolute, minutely gland-toothed, tips rounded or ob tuse to truncate, usually not notched, abaxially pale green, cobwebby, usually densely hairy, adaxially dark green, +/- hairy, glandular-papillate, slightly convex.

Inflorescences: axillary, usually raceme-like, 2.0--5.0 cm.

Flowers: deep blue.

Fruits: trihedral, shallowly 3-lobed, c. 3 mm broad, smooth, horns 0; valve crests minute.

Cytology: n = 12 [M.A. Nobs in H. McMinn 1942]

Flowering: in spring.

Habitat: open, dry, +/- wooded slopes; below 900 m.

Range: Calif. [SnFrB, SCoRO]. View Distribution Map.

Other Information:

Shrubs on King's Mountain near Ben Lomond, Santa Cruz Co., CA with leaves as C. papillosus var. papillosus but with adaxial leaf-blades +/- glabrous, barely or not glandular papillate have been called Ceanothus X regius (W. L. Jepson) H. E. McMinn. Putatively these are Ceanothus thyrsiflorus X Ceanothus papillosus var. papillosus.


b. Ceanothus papillosus

J. Torrey & A. Gray var. roweanus H. McMinn, Madrono 5: 13. 1939

Ceanothus papillosus J. Torrey & A. Gray ssp. roweanus (H. E. McMinn) P. A. Munz

Description:

Habit: Shrubs to 1.8 m.

Stems: spreading-erect, sprawling or nearly prostrate. twigs olive green, round, densely tomentose, slightly roughened, flexible.

Leaves: evergreen alternate, +/- crowded; stipules thin, deciduous; petioles c. 3 mm; blades linear to oblong, 1.3--5.0 x 0.6--1.0 cm, bases rounded, 1-veined, margins +/- revolute, minutely gland-toothed, tips rounded, truncate, usually notched, abaxially pale green, cobwebby, usually densely hairy, adaxially dark green, slightly convex, +/- hairy, glandular-papillate.

Inflorescences: axillary, usually raceme-like, 2.0--5.0 cm.

Flowers: deep blue.

Fruits: trihedral, +/- 3 mm broad, smooth, horns 0; valve crests minute.

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

Flowering: in early spring to summer.

Habitat: open, dry, +/- brushy slopes; 600-1200 m.

Range: Calif. [SCoR, WTR, nw PR (Orange co.)] . View Distribution Map.


Other Information:

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, 03-Mar-1996 22:32:17 PST

schmidtc@bcc.orst.edu