Ceanothus prostratus

Bentham

Pl. Hartw., 302. 1849.

IllustratedEndemic
Treatment appears in FNA Volume 12. Treatment on page 104. Mentioned on page 84, 87, 95, 100, 106.
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Shrubs, 0.1–0.3 m, matlike to moundlike. Stems prostrate, spreading, or ascending, rooting at distal nodes; branchlets reddish-brown, ± flexible, puberulent, glabrescent. Leaves not fascicled, crowded, usually longer than internodes and obscuring them; petiole 1–3 mm; blade flat to ± cupped, elliptic to obovate, 6–30 × 4–16 mm, base cuneate, margins sometimes thick, not revolute, sometimes wavy, sharply dentate to spinose-dentate, teeth 3–9, apex rounded, abaxial surface pale green, glabrous except sparsely strigillose on veins, adaxial surface dark green, shiny, glabrate. Inflorescences axillary, 0.9–2 cm. Flowers: sepals, petals, and nectary pale to deep blue or purplish blue. Capsules 6–9 mm wide, lobed; valves smooth to rugulose, horns subapical, prominent, erect or spreading, rugose or not, intermediate ridges present. 2n = 24.

Distribution

V12 333-distribution-map.jpg

Calif., Idaho, Nev., Oreg., Wash.

Discussion

Varieties 2 (2 in the flora).

Putative hybrids between Ceanothus prostratus and C. velutinus var. velutinus, named C. ×rugosus, have been reported from northeastern California (H. McMinn 1944). A rare putative hybrid between C. prostratus and C. cordulatus in the Lake Tahoe basin has been named C. ×serrulatus. Both C. ×rugosus and C. ×serrulatus are intersubgeneric hybrids. Formally named hybrids between C. prostratus and C. cuneatus var. cuneatus include C. ×flexilis and possibly C. ×connivens, but the latter could have C. fresnensis as one of the parents rather than C. prostratus.

Selected References

None.

Key

1 Leaf blades flat, margins not wavy, teeth usually 3–5(–7); capsule horns erect. Ceanothus prostratus var. prostratus
1 Leaf blades slightly folded lengthwise adaxially, margins ± wavy, teeth 5–9; capsule horns spreading. Ceanothus prostratus var. occidentalis

"thick" is not a number.

... more about "Ceanothus prostratus"
perigynous +  and epigynous +
rounded +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Bentham +
cuneate +
Ceanothus sect. Cerastes +
3-veined +  and veined +
not gland-dotted +
0.6 cm6 mm <br />0.006 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
elliptic;obovate +
0.4 cm4 mm <br />0.004 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
not thorn-tipped +
glabrescent +  and puberulent +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Calif. +, Idaho +, Nev. +, Oreg. +  and Wash. +
spreading +  and erect +
subapical +
not +  and rugose +
free +  and adnate +
shallowly cupulate +  and hemispheric +
unisexual +  and bisexual +
0.9 cm9 mm <br />0.009 m <br /> (2 cm20 mm <br />0.02 m <br />) +
deciduous +  and persistent +
usually longer +
dentate to spinose-dentate +
pale;deep blue or purplish blue +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
pink +, usually white +  and cream blue or purple +
adnate +  and distinct +
6 +  and 5 +
clawed +, obovate +  and spatulate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
2-4-carpellate +
Pl. Hartw., +
intermediate +
pink +, usually white +  and cream blue or purple +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
Illustrated +  and Endemic +
ascending +, spreading +  and prostrate +
Ceanothus prostratus +
Ceanothus subg. Cerastes +
species +
paniclelike +  and racemelike +
not gland-tipped +
smooth +  and rugulose +
strigillose +
unarmed +  and armed +
shrub +  and matlike +
polygamous +, dioecious +  and synoecious +