Tuesday, April 16, 2019

Rubus ursinus (California Blackberry)

7/8/07 North Grove meadow/picnic area, Calaveras Big Trees State Park, 
Central Sierras, Calaveras County, CA


COMMON NAME: California Blackberry

SPECIES: Rubus ursinus

FAMILY: Rosaceae (Rose Family)


LOCATION: North Grove Picnic Area, Calaveras Big Trees State Park, Calaveras County, CA

Treatment from Jepson eFlora:

Habit: Plant prostrate to decumbent; generally dioecious; bristles or prickles generally many, weak, slender, straight. 

Stem: 2--10 mm diam, not angled, +- glabrous to hairy, +- with stalked glands, glaucous, persisting 2 years, rooting at tips. 

Leaf: simple or compound, leaflets 3(5), terminal triangular-ovate, irregularly coarse-toothed, tip acute, abaxially sparsely to densely gray-hairy, stipules thread-like to linear, <= 1 mm wide. 

Inflorescence: cyme, flowers 1--5. 

Flower: generally unisexual; sepals hairy, prickly, +- with stalked glands; petals 6--8(11) mm in pistillate, 10--15(18) mm in staminate, elliptic to round, white; filaments thread-like; pistils > 30, styles long, slender, ovaries glabrous or hairy. 

Fruit: blackberry-type, black. 

Ecology: Common. Open, disturbed areas; 

Elevation: < 1500 m. 

Distribution Outside California: to British Columbia, Idaho, Baja California. 

Flowering Time: Mar--Jul 

Unabridged Note: Parent of several cultivars, especially loganberry, boysenberry.

Jepson eFlora Author: Lawrence A. Alice

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