Ceanothus spinosus

Nuttall in J. Torrey and A. Gray

Fl. N. Amer. 1: 267. 1838.

Common names: Green-bark ceanothus
Treatment appears in FNA Volume 12. Treatment on page 86. Mentioned on page 79.

Shrubs, sometimes arborescent, evergreen, 2–6 m. Stems erect, not rooting at nodes; branchlets green, thorn-tipped or not, round to ± angled in cross-section, rigid, glabrous or sparsely puberulent. Leaves: not fascicled; petiole 4–7 mm; blade ± cupped, elliptic to oblong, 11–35 × 8–29 mm, base cuneate to rounded, margins entire, apex obtuse to weakly retuse, abaxial surface pale green, not glaucous, sometimes puberulent on midribs, adaxial surface green, shiny, glabrous; pinnately veined. Inflorescences axillary, paniclelike, 4–17 cm. Flowers: sepals, petals, and nectary pale blue to blue. Capsules 4–6 mm wide, not lobed; valves smooth, not conspicuously viscid, not or weakly crested. 2n = 24.


Phenology: Flowering Jan–May.
Habitat: Rocky slopes, coastal sage scrub, chaparral.
Elevation: 60–900 m.

Distribution

V12 319-distribution-map.jpg

Calif., Mexico (Baja California)

Discussion

Like Ceanothus incanus, plants of C. spinosus are polymorphic for the presence of thorn-tipped branchlets. Putative hybrids with C. thyrsiflorus and C. oliganthus var. sorediatus have been reported (M. Van Rensselaer and H. McMinn 1944).

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Ceanothus spinosus"
puberulent +  and not glaucous +
perigynous +  and epigynous +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Nuttall in J. Torrey and A. Gray +
cuneate +  and rounded +
3-veined +  and veined +
not gland-dotted +
1.1 cm11 mm <br />0.011 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
elliptic;oblong +
8mm;29mm +
not +  and thorn-tipped +
puberulent +  and glabrous +
round +  and more or less angled +
not lobed +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Green-bark ceanothus +
Calif. +  and Mexico (Baja California) +
60–900 m. +
Rocky slopes, coastal sage scrub, chaparral. +
free +  and adnate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
unisexual +  and bisexual +
4 cm40 mm <br />0.04 m <br /> (17 cm170 mm <br />0.17 m <br />) +
deciduous +  and persistent +
pale blue;blue +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
adnate +  and distinct +
6 +  and 5 +
Clawed (?) +, Obovate (?) +  and Spatulate (?) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Flowering Jan–May. +
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 spinosus +
Ceanothus subg. Ceanothus +
species +
paniclelike +  and racemelike +
gland-tipped +
crested +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +