Flora of North America species comparison

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Ceanothus cyaneus

Ceanothus pauciflorus

lakeside ceanothus, San Diego buckbrush

desert buckbrush, desert buckthorn, Mojave ceanothus
Habit Shrubs, evergreen, 2–5 m. Stems erect, not rooting at nodes; branchlets light green, not thorn-tipped, angled in cross section, flexible, often tuberculate (tubercles minute, brownish), puberulent, glabrescent. Shrubs, 0.2–2 m, sometimes moundlike.
Stems

erect or weakly ascending to spreading, not rooting at nodes;

branchlets light gray to ashy gray, rigid, puberulent to tomentulose, hairs curly or wavy, glabrescent.
Leaves

petiole 2–6 mm;

blade flat, ovate-elliptic, 20–50 × 15–20 mm, base rounded, margins usually denticulate to serrulate, rarely entire, not revolute, teeth 23–58, apex acute to obtuse, abaxial surface pale green, veins puberulent, adaxial surface dark green, glabrous or sparsely puberulent; 3-veined from base.

not fascicled;

petiole (0–)1–3 mm;

blade flat to ± cupped, elliptic, oblong-elliptic, obovate, or suborbiculate, 5–15(–20) × 3–14(–15) mm, base cuneate to rounded, margins thick, not revolute, entire or remotely denticulate, teeth 1–5(–7), apex acute to ± truncate, abaxial surface pale green to grayish green, glabrate or puberulent, hairs curly or wavy, glabrescent, adaxial surface grayish green, puberulent, hairs curly or wavy, glabrescent.
Inflorescences

terminal, paniclelike, 15–30(–40) cm.

axillary, rarely racemelike, 0.7–3 cm.
Flowers

sepals, petals, and nectary deep blue.

sepals and petals white to cream, sometimes pale blue or lavender;

nectary yellowish green, brown, or blue.
Capsules

3–5 mm wide, deeply lobed;

valves smooth, weakly crested.

3.5–6 mm wide, not, or sometimes weakly, lobed;

valves smooth, horns lateral, prominent to minute or absent, spreading, intermediate ridges absent.
2n

= 24.

Ceanothus cyaneus

Ceanothus pauciflorus
Phenology Flowering Apr–Jun. Flowering Feb–May.
Habitat Rocky or gravelly slopes, chaparral. Rocky slopes, ridges, alluvial fans, sagebrush and montane shrublands, pinyon and/or juniper and montane conifer woodlands.
Elevation 40–600 m. (100–2000 ft.) 900–2900.
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; NM; NV; TX; UT; n Mexico; c Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Ceanothus cyaneus is known in the flora area only from San Diego County, and is threatened throughout its range.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Ceanothus pauciflorus as circumscribed here includes plants having flat to cupped leaf blades with a sparse to dense but not intertwined indumentum composed of short curly or wavy hairs, at least when young; this indumentum also occurs on the petiole and ultimate branchlets. Such plants in the United States have been treated either as C. greggii or C. vestitus (M. Van Rensselaer and H. McMinn 1942). However, R. McVaugh (1998) and D. O. Burge and K. Zhukovsky (2013) provided evidence that they should be treated as C. pauciflorus. Specimens from the desert slopes of the Sierra Nevada and San Bernardino Mountains, California, and a few scattered localities in western Arizona, have leaves similar in shape and dentation to those of C. perplexans, suggesting local hybridization.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 90. FNA vol. 12, p. 107.
Parent taxa Rhamnaceae > Ceanothus > subg. Ceanothus Rhamnaceae > Ceanothus > subg. Cerastes
Sibling taxa
C. americanus, C. arboreus, C. arcuatus, C. confusus, C. cordulatus, C. crassifolius, C. cuneatus, C. dentatus, C. divergens, C. diversifolius, C. fendleri, C. ferrisiae, C. foliosus, C. fresnensis, C. gloriosus, C. griseus, C. hearstiorum, C. herbaceus, C. impressus, C. incanus, C. integerrimus, C. jepsonii, C. lemmonii, C. leucodermis, C. maritimus, C. martini, C. masonii, C. megacarpus, C. microphyllus, C. oliganthus, C. ophiochilus, C. otayensis, C. palmeri, C. papillosus, C. parryi, C. parvifolius, C. pauciflorus, C. perplexans, C. pinetorum, C. prostratus, C. pumilus, C. purpureus, C. roderickii, C. sanguineus, C. sonomensis, C. spinosus, C. thyrsiflorus, C. tomentosus, C. velutinus, C. verrucosus
C. americanus, C. arboreus, C. arcuatus, C. confusus, C. cordulatus, C. crassifolius, C. cuneatus, C. cyaneus, C. dentatus, C. divergens, C. diversifolius, C. fendleri, C. ferrisiae, C. foliosus, C. fresnensis, C. gloriosus, C. griseus, C. hearstiorum, C. herbaceus, C. impressus, C. incanus, C. integerrimus, C. jepsonii, C. lemmonii, C. leucodermis, C. maritimus, C. martini, C. masonii, C. megacarpus, C. microphyllus, C. oliganthus, C. ophiochilus, C. otayensis, C. palmeri, C. papillosus, C. parryi, C. parvifolius, C. perplexans, C. pinetorum, C. prostratus, C. pumilus, C. purpureus, C. roderickii, C. sanguineus, C. sonomensis, C. spinosus, C. thyrsiflorus, C. tomentosus, C. velutinus, C. verrucosus
Synonyms C. greggii, C. greggii var. franklinii, C. vestitus
Name authority Eastwood: Proc. Calif. Acad. Sci., ser. 4, 16: 361. (1927) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 2: 33. (1825)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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