Ceanothus papillosus |
Ceanothus arboreus |
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wartleaf ceanothus |
feltleaf ceanothus, island 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, sometimes arborescent, evergreen, 2–7 m. Stems erect, not rooting at nodes; branchlets brown, not thorn-tipped, round or slightly angled in cross section, flexible, tomentulose. |
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. |
petiole 8–25 mm; blade not aromatic, flat to cupped, widely ovate to elliptic, 25–80 × 20–40 mm, herbaceous, not resinous, base rounded, margins serrulate, teeth (35–)40–65, apex acute to obtuse, abaxial surface pale green, usually densely tomentulose, rarely glabrate, adaxial surface green, dull, glabrous or sparsely puberulent; 3-veined from base. |
Inflorescences | axillary or terminal, racemelike, 2–8 cm. |
axillary or terminal, paniclelike, conic, 5–12 cm. |
Flowers | sepals, petals, and nectary deep blue. |
sepals and petals pale blue to blue; nectary blue to dark blue. |
Capsules | 2–3 mm wide, lobed; valves smooth, viscid when young, not or weakly crested. |
6–8 mm wide, ± lobed; valves rugose, ± viscid, weakly crested. |
2n | = 24. |
= 24. |
Ceanothus papillosus |
Ceanothus arboreus |
|
Phenology | Flowering Mar–May. | Flowering Feb–May. |
Habitat | Rocky ridges, slopes, and flats, chaparral, mixed evergreen forests. | Rocky slopes, ridges, chaparral, oak woodlands, closed-cone pine woodlands. |
Elevation | 20–1500 m. (100–4900 ft.) | 60–600 m. (200–2000 ft.) |
Distribution |
CA; Mexico (Baja California)
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CA; Mexico (Baja California)
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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.) |
Ceanothus arboreus is restricted to Santa Catalina, Santa Cruz, and Santa Rosa islands, California, and Guadalupe Island, Baja California. Plants with glabrate leaves on Santa Cruz and Santa Rosa Islands have been called C. arboreus var. glaber. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 92. | FNA vol. 12, p. 88. |
Parent taxa | Rhamnaceae > Ceanothus > subg. Ceanothus | Rhamnaceae > Ceanothus > subg. Ceanothus |
Sibling taxa | ||
Synonyms | C. papillosus subsp. roweanus, C. papillosus var. roweanus | C. arboreus var. glaber |
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 268. (1838) | Greene: Bull. Calif. Acad. Sci. 2: 144. (1886) |
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