Flora of North America species comparison

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Ceanothus cyaneus

Ceanothus tomentosus

lakeside ceanothus, San Diego buckbrush

woolly leaf ceanothus, woolyleaf 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, evergreen, 1.5–2.5 m. Stems erect, rarely spreading, not rooting at nodes; branchlets reddish brown, not thorn-tipped, round in cross section, flexible, tomentulose, 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.

petiole 1–4 mm;

blade flat, ovate to widely elliptic, 10–25 × 5–12 mm, base obtuse to rounded, margins serrulate to denticulate most of length, not revolute, teeth 39–71, apex obtuse, abaxial surface light or gray-green, tomentose to tomentulose, adaxial surface dark green, villosulous or puberulent, glabrescent; usually 3-veined from base, rarely pinnately veined (veins sometimes obscured by indumentum).
Inflorescences

terminal, paniclelike, 15–30(–40) cm.

axillary or terminal, racemelike or paniclelike, 2–6 cm.
Flowers

sepals, petals, and nectary deep blue.

sepals, petals, and nectary usually deep blue, sometimes pale blue.
Capsules

3–5 mm wide, deeply lobed;

valves smooth, weakly crested.

3–4 mm wide, slightly lobed at apex;

valves smooth, viscid when young, crested.
2n

= 24.

Ceanothus cyaneus

Ceanothus tomentosus
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; nw 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.)

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaf blade abaxial surfaces uniformly and densely tomentulose, veins obscured; c Sierra Nevada, California.
var. tomentosus
1. Leaf blade abaxial surfaces sparsely to moderately tomentulose, veins ± evident; s California.
var. olivaceus
Source FNA vol. 12, p. 90. FNA vol. 12, p. 89.
Parent taxa Rhamnaceae > Ceanothus > subg. Ceanothus Rhamnaceae > Ceanothus > subg. Ceanothus
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. pauciflorus, C. perplexans, C. pinetorum, C. prostratus, C. pumilus, C. purpureus, C. roderickii, C. sanguineus, C. sonomensis, C. spinosus, C. thyrsiflorus, C. velutinus, C. verrucosus
Subordinate taxa
C. tomentosus var. olivaceus, C. tomentosus var. tomentosus
Name authority Eastwood: Proc. Calif. Acad. Sci., ser. 4, 16: 361. (1927) Parry: Proc. Davenport Acad. Nat. Sci. 5: 190. (1889)
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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