Ceanothus incanus

Torrey & A. Gray

Fl. N. Amer. 1: 265. 1838.

Common names: Coast whitethorn
Endemic
Treatment appears in FNA Volume 12. Treatment on page 86. Mentioned on page 79, 80, 87, 90.

Shrubs, evergreen, 1–4 m. Stems erect, not rooting at nodes; branchlets light gray, glaucous, thorn-tipped or not, round or slightly angled in cross-section, rigid, puberulent, glabrescent. Leaves not fascicled; petiole 3–12 mm; blade flat, elliptic, ovate, or suborbiculate, 20–60 × 10–30 mm, base rounded or subcordate, margins entire, sometimes minutely glandular-denticulate above middle, glands 26–52, apex obtuse, abaxial surface pale green, appressed-puberulent, glabrescent, adaxial surface grayish green, dull, glabrate; 3-veined from base. Inflorescences axillary, usually paniclelike, sometimes racemelike, 3–6 cm. Flowers: sepals, petals, and nectary usually white to cream, sometimes pink. Capsules 4–5 mm wide, ± lobed; valves rugose, viscid when young, not or weakly crested. 2n = 24.


Phenology: Flowering Apr–Jun.
Habitat: Flats, slopes, chaparral, open sites in conifer and mixed evergreen forests.
Elevation: 60–1000 m.

Discussion

Ceanothus incanus is restricted to the Klamath and Santa Cruz mountains and North Coast Ranges of California. Some populations are evidently polymorphic for the presence of thorn-tipped or non-thorn-tipped branchlets (F. K. Klein 1970). Putative hybrids with C. papillosus and C. parryi have been reported (H. McMinn 1944); hybrids with C. thyrsiflorus have been called C. ×vanrensselaeri Roof.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Ceanothus incanus"
glabrescent +  and appressed-puberulent +
perigynous +  and epigynous +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Torrey & A. Gray +
subcordate +  and rounded +
3-veined +  and veined +
not gland-dotted +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
suborbiculate;ovate;suborbiculate;ovate;elliptic;flat +
10mm;30mm +
not +  and thorn-tipped +
glabrescent +, puberulent +  and glaucous +
angled +  and round +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Coast whitethorn +
60–1000 m. +
Flats, slopes, chaparral, open sites in conifer and mixed evergreen forests. +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
unisexual +  and bisexual +
racemelike +  and paniclelike +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
deciduous +  and persistent +
glandular-denticulate +
pink;usually white;cream +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering Apr–Jun. +
2-4-carpellate +
Fl. N. Amer. +
pink +, usually white +  and cream blue or purple +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
not rooting +
3-veined +  and veined +
Ceanothus incanus +
Ceanothus subg. Ceanothus +
species +
paniclelike +  and racemelike +
gland-tipped +
crested +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +