Flora of North America species comparison

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Ceanothus gloriosus

Ceanothus sonomensis

glory mat, Point Reyes ceanothus

Sonoma ceanothus
Habit Shrubs, 0.1–3 m, matlike to moundlike. Shrubs, 0.5–1 m, often 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.

erect to ascending, not rooting at nodes;

branchlets gray to grayish brown, rigid, strigillose, glabrescent.
Leaves

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.

not fascicled;

petiole 0–1 mm;

blade cupped, widely obovate to suborbiculate, 5–12 × 2–10 mm, base cuneate, margins not revolute, wavy, spinose-dentate, teeth 2–4, apex widely notched;

abaxial surface pale green or grayish green and glaucous, strigillose on veins, adaxial surface shiny green, glabrous.
Inflorescences

axillary, 0.9–2.5 cm.

axillary or terminal, 0.8–1.5 cm.
Flowers

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

sepals, petals, and nectary blue to lavender.
Capsules

4–6 mm wide, lobed;

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

4–5 mm wide, usually not, sometimes weakly lobed;

valves smooth, horns subapical, minute to ± prominent, erect, intermediate ridges absent.
2n

= 24.

Ceanothus gloriosus

Ceanothus sonomensis
Phenology Flowering Mar–Apr.
Habitat Sandy to rocky soils derived mostly from volcanic substrates, slopes, ridges, chaparral.
Elevation 100–700 m. (300–2300 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[BONAP county map]
Discussion

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.)

Ceanothus sonomensis is distinctive in having spinose-dentate, few-toothed leaves, and slender fruit horns two to three millimeters; it occurs at a few scattered localities in the mountains of Napa and Sonoma counties.

(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. 102. FNA vol. 12, p. 103.
Parent taxa Rhamnaceae > Ceanothus > subg. Cerastes Rhamnaceae > Ceanothus > subg. Cerastes
Sibling taxa
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
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. pauciflorus, C. perplexans, C. pinetorum, C. prostratus, C. pumilus, C. purpureus, C. roderickii, C. sanguineus, 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 J. T. Howell: Leafl. W. Bot. 2: 43. (1937) J. T. Howell: Leafl. W. Bot. 2: 162. (1939)
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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