|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|Family: Rhamnaceae||View Description||Dichotomous Key|
|Genus: Rhamnus||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Rhamnus crocea Nutt.
Habit: Shrub, < 2 m. Stem: bark gray; branches many, spreading, stiff, rooting; twigs +- thorn-tipped, red or red-purple. Leaf: evergreen; petiole 1--4 mm; blade 10--15 mm, elliptic to obovate, thick, glabrous, abaxially flat, base acute to rounded, tip rounded, margin sharp-toothed or entire, veins not prominent. Inflorescence: 1--6-flowered, glabrous; pedicel 1--6 mm. Flower: generally unisexual; hypanthium +- 2 mm wide; sepals 4; petals 0. Fruit: 2-stoned, 6 mm, red.
Ecology: Coastal-sage scrub, chaparral, woodland; Elevation: < 1150 m. Bioregional Distribution: KR, NCoRO, SNH, CW, SW; Distribution Outside California: Baja California. Flowering Time: Jan--Apr
Unabridged Note: Rhamnus crocea and its closely related species were considered conspecific by C.B. Wolf (1938) (e.g., Rhamnus crocea subsp. crocea, Rhamnus crocea subsp. ilicifolia, Rhamnus crocea subsp. pilosa, Rhamnus crocea subsp. pirifolia). Another, Rhamnus insula Kellogg (Rhamnus insula subsp. insula (Kellogg) C.B. Wolf) is restricted to Mexico (Baja California). The species are distinctive but intermediates exist. C.B. Wolf (1938) identified Rhamnus crocea/ilicifolia intermediates from Marin Co. to the California/Mexicoico boundary; Rhamnus ilicifolia/insula, Rhamnus crocea/pilosa, and Rhamnus ilicifolia/pilosa intermediates occur in southern California, especially in San Diego Co. Clearly, the Rhamnus crocea complex in California needs studies using modern techniques.
eFlora Treatment Author: John O. Sawyer, Jr.
Jepson Online Interchange
Previous taxon: Rhamnus alnifolia
Next taxon: Rhamnus ilicifolia
Citation for this treatment: John O. Sawyer, Jr. 2016. Rhamnus crocea, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=41069, accessed on May 05, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 05, 2016.