Flora of North America species comparison

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Ceanothus cyaneus

Ceanothus gloriosus

lakeside ceanothus, San Diego buckbrush

glory mat, Point Reyes 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, 0.1–3 m, matlike to moundlike.
Stems

prostrate, spreading, ascending, or erect, sometimes rooting at proximal nodes;

branchlets green to brown or reddish brown, flexible to rigid, strigillose or tomentulose.
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, not crowded;

petiole 1–4 mm;

blade flat to ± cupped or folded lengthwise adaxially, widely elliptic, obovate, or suborbiculate, 10–40(–45) × 5–24 mm, base cuneate to ± rounded, margins not revolute, sometimes slightly thickened, dentate to denticulate most of length, teeth 9–35, apex rounded, truncate, or retuse, abaxial surface pale green, sparsely strigillose or glabrate, adaxial surface dark green, ± shiny, glabrous.
Inflorescences

terminal, paniclelike, 15–30(–40) cm.

axillary, 0.9–2.5 cm.
Flowers

sepals, petals, and nectary deep blue.

sepals, petals, and nectary deep blue to bluish purple.
Capsules

3–5 mm wide, deeply lobed;

valves smooth, weakly crested.

4–6 mm wide, lobed;

valves usually smooth, sometimes rugulose or crested distal to middle, horns subapical, minute, not rugose, intermediate ridges absent.
2n

= 24.

Ceanothus cyaneus

Ceanothus gloriosus
Phenology Flowering Apr–Jun.
Habitat Rocky or gravelly slopes, chaparral.
Elevation 40–600 m. (100–2000 ft.)
Distribution
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[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.)

Varieties 3 (3 in the flora).

Ceanothus gloriosus is composed of three varieties occurring along the northern California coast from Humboldt County to Marin County. Variety gloriosus and var. porrectus generally differ primarily by leaf shape, length and width, and the number of marginal teeth. Variety exaltatus differs from the other two varieties primarily in stature. Complex hybrids with C. cuneatus var. ramulosus, C. divergens, and C. sonomensis were studied by J. T. Howell (1940).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Shrubs 0.8–3 m; stems erect to ascending.
var. exaltatus
1. Shrubs 0.1–0.5 m; stems prostrate to spreading.
→ 2
2. Leaf blades widely obovate to suborbiculate, 23–31(–45) × 17–24 mm, marginal teeth 13–31.
var. gloriosus
2. Leaf blades elliptic, obovate, or narrowly obovate, 10–21 × 5–15 mm, marginal teeth 9–19.
var. porrectus
Source FNA vol. 12, p. 90. FNA vol. 12, p. 102.
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. 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
Subordinate taxa
C. gloriosus var. exaltatus, C. gloriosus var. gloriosus, C. gloriosus var. porrectus
Name authority Eastwood: Proc. Calif. Acad. Sci., ser. 4, 16: 361. (1927) J. T. Howell: Leafl. W. Bot. 2: 43. (1937)
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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