Ceanothus griseus

(Trelease) McMinn in M. van Rensselaer and H. McMinn

Ceanothus, 210. 1942.

Common names: Carmel ceanothus
Endemic
Basionym: Ceanothus thyrsiflorus var. griseus Trelease in A. Gray et al. Syn. Fl. N. Amer. 1(1,2): 415. 1897
Synonyms: C. griseus var. horizontalis McMinn
Treatment appears in FNA Volume 12. Treatment on page 91. Mentioned on page 81, 90, 92.

Shrubs, sometimes arborescent, evergreen, 0.5–4 m. Stems erect, ascending to arcuate, rarely prostrate, not rooting at nodes; branchlets green, not thorn-tipped, angled in cross-section, flexible, sparsely puberulent or glabrous. Leaves: petiole 5–10 mm; blade flat to cupped, ovate to suborbiculate, 10–45 × 10–30 mm, base obtuse to rounded, margins denticulate, ± revolute, teeth 21–45, apex obtuse to rounded, abaxial surface pale green, puberulent to densely villosulous, veins prominently raised, puberulent to villosulous, adaxial surface dark green, glabrate; 3-veined from base. Inflorescences axillary, paniclelike, 2–7 cm. Flowers: sepals, petals, and nectary blue. Capsules 3–4 mm wide, weakly lobed at apex; valves smooth, viscid, not crested.


Phenology: Flowering Mar–Jun.
Habitat: Sandy or rocky flats and slopes, maritime chaparral, open sites in pine and cypress forests.
Elevation: 10–200 m.

Discussion

Ceanothus griseus is distributed along the coast from Mendocino County south to Santa Barbara County. Plants with incompletely revolute leaf margins and abaxial surfaces intermediate or similar to those of C. thyrsiflorus are encountered frequently. Whether this pattern is a result of primary or secondary intergradation is not known. Prostrate plants with wide elliptic leaves have been called C. griseus var. horizontalis McMinn; they retain their stature under cultivation. Putative hybrids with C. dentatus have been named C. ×lobbianus Hooker (M. Van Rensselaer and H. McMinn 1942). Ceanothus ×veitchianus Hooker is a rare intersubgeneric hybrid between C. griseus and C. rigidus, first collected by William Lobb near Monterey in 1853, that is cultivated in Great Britain as an ornamental.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Ceanothus griseus"
puberulent +  and densely villosulous +
perigynous +  and epigynous +
Obtuse (?) +  and Rounded (?) +
Clifford L. Schmidt† +  and Dieter H. Wilken +
(Trelease) McMinn in M. van Rensselaer and H. McMinn +
obtuse +  and rounded +
Ceanothus thyrsiflorus var. griseus +
3-veined +  and veined +
not gland-dotted +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
ovate;suborbiculate +
10mm;30mm +
not thorn-tipped +
glabrous +  and puberulent +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Carmel ceanothus +
10–200 m. +
Sandy or rocky flats and slopes, maritime chaparral, open sites in pine and cypress 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 +
2 cm20 mm <br />0.02 m <br /> (7 cm70 mm <br />0.07 m <br />) +
deciduous +  and persistent +
denticulate +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Mar–Jun. +
2-4-carpellate +
pink +, usually white +  and cream blue or purple +
distinct +
spreading +  and incurved +
6 +  and 5 +
keeled;lanceolate;deltate +
not rooting +
ascending +  and erect +
3-veined +  and veined +
C. griseus var. horizontalis +
Ceanothus griseus +
Ceanothus subg. Ceanothus +
species +
paniclelike +  and racemelike +
gland-tipped +
not crested +
puberulent +  and villosulous +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +