Ceanothus papillosus

Torrey & A. Gray

Fl. N. Amer. 1: 268. 1838.

Common names: Wartleaf ceanothus
Synonyms: Ceanothus papillosus subsp. roweanus (McMinn) Munz C. papillosus var. roweanus McMinn
Treatment appears in FNA Volume 12. Treatment on page 92. Mentioned on page 80, 87, 91.

Shrubs, evergreen, 1–5 m. Stems erect to ascending, not rooting at nodes; branchlets green to reddish-brown, not thorn-tipped, round in cross-section, ± flexible to rigid, densely tomentulose. Leaves: petiole 1–3 mm; blade cupped to flat, linear, narrowly oblong, or oblongelliptic, 12–50 × 6–15 mm, base obtuse to rounded, margins minutely glandular-denticulate, revolute, glands 17–31, apex obtuse, truncate, or retuse, abaxial surface pale green, densely villosulous to tomentulose, adaxial surface dark green, sparsely puberulent and glandular-papillate; pinnately veined. Inflorescences axillary or terminal, racemelike, 2–8 cm. Flowers: sepals, petals, and nectary deep blue. Capsules 2–3 mm wide, lobed; valves smooth, viscid when young, not or weakly crested. 2n = 24.


Phenology: Flowering Mar–May.
Habitat: Rocky ridges, slopes, and flats, chaparral, mixed evergreen forests.
Elevation: 20–1500 m.

Distribution

V12 328-distribution-map.jpg

Calif., Mexico (Baja California)

Discussion

Ceanothus papillosus occurs in the Coast Ranges from San Francisco Bay south to the Santa Ynez Mountains, Ventura County, with disjunct populations in the Santa Ana Mountains, California, and Cerro Bola, in northern Baja California. The name C. papillosus var. roweanus was originally applied to low-growing plants with ascending to spreading, arcuate branches (H. McMinn 1939). M. Van Rensselaer and McMinn (1942) later emended the circumscription to include plants with linear leaves and retuse to truncate leaf apices, but these are found throughout the range of the species. Leaves with obtuse to truncate or retuse leaf apices also can be found on the same plant. Putative hybrids with C. integerrimus and C. oliganthus have been documented (McMinn 1944). Hybrids with C. thyrsiflorus have been named C. ×regius (Jepson) McMinn. Some putatively advanced generation hybrids have narrowly elliptic, weakly papillate leaves with obtuse apices, and sometimes have been misinterpreted as belonging to C. papillosus.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Ceanothus papillosus"
densely villosulous +  and tomentulose +
glandular-papillate +
perigynous +  and epigynous +
Retuse (?) +, Truncate (?) +  and Obtuse (?) +
Clifford L. Schmidt† +  and Dieter H. Wilken +
Torrey & A. Gray +
1.2 cm12 mm <br />0.012 m <br /> (5 cm50 mm <br />0.05 m <br />) +
oblongelliptic +, oblong +, linear +  and flat +
6mm;15mm +
3-veined +  and veined +
not gland-dotted +
3[-5]-veined +  and pinnate +
spinulose +, spinose +, serrate +  and entire +
denticulate +, dentate +, crenulate +, crenate +  and serrulate +
obtuse;rounded +
not thorn-tipped +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Wartleaf ceanothus +
Calif. +  and Mexico (Baja California) +
20–1500 m. +
Rocky ridges, slopes, and flats, chaparral, mixed evergreen forests. +
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 +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
deciduous +  and persistent +
glandular-denticulate +
intrastaminal +
superior +  and inferior +
not fleshy +
perigynous +  and epigynous +
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 />) +
Flowering Mar–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 +
erect +  and ascending +
3-veined +  and veined +
Ceanothus papillosus subsp. roweanus +  and C. papillosus var. roweanus +
Ceanothus papillosus +
Ceanothus subg. Ceanothus +
species +
paniclelike +  and racemelike +
gland-tipped +
crested +
unarmed +  and armed +
polygamous +, dioecious +  and synoecious +