Ceanothus papillosus |
Ceanothus crassifolius |
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wartleaf ceanothus |
hoary-leaf ceanothus |
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Habit | 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. | Shrubs, 1.5–4 m. Stems erect, not rooting at nodes; branchlets grayish brown to brown, ± flexible to rigid, tomentulose, hairs straight. | ||||
Leaves | petiole 1–3 mm; blade cupped to flat, linear, narrowly oblong, or oblong-elliptic, 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. |
not fascicled; petiole 2–6 mm; blade flat to ± cupped, elliptic to widely elliptic, 12–25(–30) × 8–15(–23) mm, base obtuse to rounded, margins thick or revolute, entire to denticulate most of length, teeth 8–19, apex obtuse to rounded, abaxial surface pale green to white, tomentulose to glabrate, adaxial surface green, sparsely tomentulose, hairs straight, glabrescent. |
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Inflorescences | axillary or terminal, racemelike, 2–8 cm. |
axillary or terminal, 1–2 cm. |
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Flowers | sepals, petals, and nectary deep blue. |
sepals and petals white; nectary blue to black. |
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Capsules | 2–3 mm wide, lobed; valves smooth, viscid when young, not or weakly crested. |
5–9 mm wide, sometimes weakly lobed at apex; valves viscid, smooth, horns lateral, prominent, erect, intermediate ridges absent. |
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2n | = 24. |
= 24. |
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Ceanothus papillosus |
Ceanothus crassifolius |
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Phenology | Flowering Mar–May. | |||||
Habitat | Rocky ridges, slopes, and flats, chaparral, mixed evergreen forests. | |||||
Elevation | 20–1500 m. (100–4900 ft.) | |||||
Distribution |
CA; Mexico (Baja California)
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CA; nw Mexico
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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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 12, p. 92. | FNA vol. 12, p. 98. | ||||
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Cerastes | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. papillosus subsp. roweanus, C. papillosus var. roweanus | |||||
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 268. (1838) | Torrey: in War Department [U.S.], Pacif. Railr. Rep. 4(5): 75. (1857) | ||||
Web links |