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Ceanothus thyrsiflorus var. thyrsiflorus

Higher Taxonomy
Family: RhamnaceaeView DescriptionDichotomous Key

Habit: [Perennial herb] shrub, tree, generally erect, often thorny. Leaf: simple, generally alternate, often clustered on short-shoots; stipules generally present, occasionally modified into spines; generally petioled; blade pinnate-veined or 1--5-ribbed from base. Inflorescence: cyme, panicle, umbel, or flowers 1 or clustered in axils or on short-shoots. Flower: generally bisexual, radial; hypanthium subtending, surrounding, or partly fused to ovary; sepals 4--5; petals 0, 4--5, generally clawed; stamens 0, 4--5, alternate sepals, attached to hypanthium top, each generally fitting into a petal concavity; disk (0 or) between stamens, ovary, thin to fleshy, entire or lobed, free from ovary, adherent or fused to hypanthium; ovary superior or +- inferior, chambers [1]2--4, 1--2-ovuled, style 1, stigma entire or 2--3-lobed. Fruit: capsule, drupe.
Genera In Family: 50--52 genera, 950 species: especially tropics, subtropics some cultivated (Ceanothus; Frangula; Rhamnus; Ziziphus).
eFlora Treatment Author: John O. Sawyer, Jr., except as noted
Scientific Editor: Steve Boyd, Thomas J. Rosatti.
Genus: CeanothusView DescriptionDichotomous Key

Habit: Shrub, tree-like or not, generally erect or mat- to mound-like. Stem: branches generally arranged like leaves; twigs thorn-like or not, generally not angled. Leaf: alternate or opposite, some clustered on short-shoots or not, deciduous or evergreen; stipules scale-like, thin, deciduous, or knob-like, corky, thick, base persistent; blade flat or wavy, tip generally acute to obtuse, margin thick (i.e., thicker than adjacent blade) or not, rolled under or not, wavy or not, entire or gland- or sharp-toothed, glands generally dark, teeth pale, alternate blade 1--3-ribbed from base, generally thin, opposite blade 1-ribbed from base, thick, firm. Inflorescence: umbel-, raceme-, or panicle-like aggregations of few-flowered clusters, axillary or terminal; pedicels white to deep blue or pink. Flower: conspicuous, generally < 5 mm; hypanthium surrounding fleshy disk below ovary base, in fruit thick, not splitting; sepals generally 5, lance-deltate, incurved, colored like petals, persistent; petals generally 5, blade hood-like, white to deep blue or pink; stamens generally 5, opposite petals; ovary 1/2-inferior, 3-lobed, chambers 3, each 1-ovuled, styles 3. Fruit: capsule, +- spheric, generally +- 3-lobed, generally smooth, 3-ridged or not, horned or not. Seed: 3, 2--5 mm.
Species In Genus: +- 55 species: North America. Etymology: (Greek: thorny pl) Note: Hybrids common (named hybrids not recognized here), discussed in Fross & Wilken; hybrid forms do not key easily. As recircumscribed here, Ceanothus greggii A. Gray restricted to Mexico.
eFlora Treatment Author: Dieter H. Wilken
Species: Ceanothus thyrsiflorusView Description 

Habit: Plant mat-like to erect, occasionally tree-like, +- open, < 6 m. Stem: spreading to erect; twigs flexible, not thorn-like, angled distally, ridged, green. Leaf: alternate, evergreen; stipules scale-like; petiole 3--9 mm; blade 10--39 mm, 5--20 mm wide, oblong-ovate, ovate, or widely elliptic, +- firm, adaxially dark green, glabrous, abaxially paler, glabrous to puberulent between veins or not, veins +- raised, sparsely puberulent, tip obtuse to rounded, margin +- gland-toothed. Inflorescence: generally raceme- or panicle-like, 1.5--7 cm. Flower: light to deep blue (white). Fruit: 2.5--4 mm wide, sticky; horns 0.

Ceanothus thyrsiflorus Eschsch. var. thyrsiflorus
Stem: twigs +- glabrous. Leaf: blade oblong-ovate to elliptic, margin not to partly rolled under. Chromosomes: 2n=24.
Ecology: Bluffs, slopes, canyons, chaparral, coastal scrub, closed-cone-pine forest; Elevation: < 800 m. Bioregional Distribution: NCo, KR, s NCoRI, NCoRO, CCo, SnFrB, SCoRO; Distribution Outside California: southwestern Oregon, northern Baja California. Flowering Time: Mar--Jun
Synonyms: Ceanothus thyrsiflorus var. chandleri Jeps.; Ceanothus thyrsiflorus var. repens McMinn
eFlora Treatment Author: Dieter H. Wilken
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botanical illustration including Ceanothus thyrsiflorus var. thyrsiflorus


Citation for this treatment: Dieter H. Wilken 2016. Ceanothus thyrsiflorus var. thyrsiflorus, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on May 03, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on May 03, 2016.

Ceanothus thyrsiflorus var. thyrsiflorus
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© 2006 Steve Matson
Ceanothus thyrsiflorus var. thyrsiflorus
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© 2015 Barry Breckling
Ceanothus thyrsiflorus var. thyrsiflorus
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© 2006 Steve Matson
Ceanothus thyrsiflorus var. thyrsiflorus
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© 2013 Neal Kramer
Ceanothus thyrsiflorus var. thyrsiflorus
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© 2015 Barry Breckling
Ceanothus thyrsiflorus var. thyrsiflorus
click for enlargement
© 2006 Steve Matson

More photos of Ceanothus thyrsiflorus var. thyrsiflorus in CalPhotos

Geographic subdivisions for Ceanothus thyrsiflorus var. thyrsiflorus:
NCo, KR, s NCoRI, NCoRO, CCo, SnFrB, SCoRO;
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.