Ceanothus arboreus

Ceanothus arboreus FELTLEAF CEANOTHUS

Higher Taxonomy

Family: Rhamnaceae

Common Name: BUCKTHORN FAMILY
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.

Ceanothus arboreus Greene

NATIVE
Habit: Plant < 7 m, occasionally tree-like. Stem: generally erect; twigs flexible, not thorn-like, brown. Leaf: alternate, evergreen; stipules scale-like; petiole 10--25 mm; blade 25--80 mm, 20--40 mm wide, widely ovate to elliptic, thick, leathery, adaxially dark green, generally glabrous, abaxially pale green, generally short-tomentose, veins +- obscured by hairs, occasionally +- glabrous, margin serrate, teeth 35--65, generally gland-tipped. Inflorescence: raceme- to panicle-like, 5--8 cm. Flower: generally blue. Fruit: 5--8 mm wide, +- sticky, +- 3-ridged, black; horns 0.
Ecology: Slopes, chaparral, oak woodland; Elevation: 60--580 m. Bioregional Distribution: ChI; Distribution Outside California: Baja California (Guadalupe Island). Flowering Time: Feb--May
Synonyms: Ceanothus arboreus var. arboreus; Ceanothus arboreus var. glaber Jeps.; Ceanothus arboreus var. glabra Jeps., superfl.
Jepson eFlora Author: Dylan O. Burge & Dieter H. Wilken
Reference: Fross & Wilken 2006 Ceanothus. Timber Press; Burge et al. 2015 Syst Bot 40:950--961.
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Next taxon: Ceanothus arcuatus

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Citation for this treatment: Dylan O. Burge & Dieter H. Wilken 2020, Ceanothus arboreus, in Jepson Flora Project (eds.) Jepson eFlora, Revision 8, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=18428, accessed on October 03, 2023.

Citation for the whole project: Jepson Flora Project (eds.) 2023, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on October 03, 2023.

Ceanothus arboreus

Ceanothus arboreus

More photos of Ceanothus arboreus in CalPhotos

Geographic subdivisions for Ceanothus arboreus: ChI	MAP CONTROLS 1. You can change the display of the base map layer control box in the upper right-hand corner. 2. County and Jepson Region polygons can be turned off and on using the check boxes.

(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).	Data provided by the participants of the Consortium of California Herbaria. MAP LEGEND View all CCH records All markers link to CCH specimen records. The original determination is shown in the popup window. Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. READ ABOUT YELLOW FLAGS CCH collections by month Duplicates counted once; synonyms included. Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA. Blue line denotes eFlora flowering time (fruiting time in some monocot genera).