Ceanothus jepsonii

Greene

Man. Bot. San Francisco, 78. 1894.

Common names: Jepson’s ceanothus
IllustratedEndemic
Treatment appears in FNA Volume 12. Treatment on page 106. Mentioned on page 77, 96.

Shrubs, 0.5–1.5 m. Stems erect to ascending, not rooting at nodes; branchlets reddish to grayish brown, rigid, puberulent, glabrescent. Leaves not fascicled, deflexed; petiole 0–2 mm; blade ± cupped, slightly folded lengthwise adaxially, elliptic to ± oblong, 10–20 × 5–13 mm, base rounded, margins thick or slightly revolute, spinose-dentate, teeth 7–11, apex rounded or sharply acute, abaxial surface pale yellowish green, glabrous, adaxial surface pale green, glabrous. Inflorescences axillary or terminal, 1–2 cm. Flowers: sepals and petals (5–) 6 (–8), usually blue to lavender or white, rarely pink; nectary blue; stamens (5–) 6 (–8). Capsules 5–7 mm wide, lobed; valves rugose, horns subapical, prominent, thick, erect, rugose, intermediate ridges present.

Discussion

Varieties 2 (2 in the flora).

Ceanothus jepsonii, composed of two, allopatric varieties, is the only species with mostly six (rarely eight) sepals and petals, and cymules reduced to solitary flowers (M. A. Nobs 1963). T. M. Hardig et al. (2000) provided evidence showing that the two varieties may not form a monophyletic group. H. McMinn (1942) and Nobs (1963) reported putative hybrids with C. cuneatus and C. prostratus.

Selected References

None.

Key

1 Sepals and petals usually pale blue to lavender, rarely pink or white; capsules globose. Ceanothus jepsonii var. jepsonii
1 Sepals and petals white; capsules ± oblong. Ceanothus jepsonii var. albiflorus

"thick" is not a number.

... more about "Ceanothus jepsonii"
green +  and pale yellowish +
perigynous +  and epigynous +
Acute (?) +  and Rounded (?) +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Greene +
rounded +
Ceanothus sect. Cerastes +
3-veined +  and veined +
not gland-dotted +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
elliptic;more or less oblong +
5mm;13mm +
not thorn-tipped +
glabrescent +  and puberulent +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Jepson’s ceanothus +
subapical +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
terminal +  and axillary +
unisexual +  and bisexual +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
deciduous +  and persistent +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
2-4-carpellate +
Man. Bot. San Francisco, +
intermediate +
pink +, usually blue +  and lavender or white +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
Illustrated +  and Endemic +
not rooting +
erect +  and ascending +
Ceanothus jepsonii +
Ceanothus subg. Cerastes +
species +
paniclelike +  and racemelike +
not gland-tipped +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +