Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Annual to tree
Leaves simple to pinnately to palmately compound, generally alternate; stipules free to fused, persistent to deciduous
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, often with bractlets alternate with sepals; sepals generally 5; petals generally 5, free; stamens (0)5–many, pistils (0)1–many, simple or compound; ovary superior to inferior, styles 1–5
Fruit: achene, follicle, drupe, pome, or blackberry- to raspberry-like
Seeds generally 1–5
Genera in family: 110 genera, ± 3000 species: worldwide, especially temp. Many cultivated for ornamental and fruit, especially Cotoneaster , Fragaria , Malus , Prunus , Pyracantha, Rosa , and Rubus
Reference: [Robertson 1974 J Arnold Arbor 55:303–332,344–401,611–662]
Family description, key to genera by Barbara Ertter and Dieter H. Wilken.



Thomas J. Rosatti

Shrub or small tree
Leaves ± clustered on short lateral branches, mostly deciduous, generally deeply lobed, ± strongly rolled under, generally with ± sunken glands above; bases persistent, overlapping, sheathing stem
Inflorescence: flowers solitary on side-branch tips
Flower: hypanthium ± funnel-shaped, sometimes partly glandular, bractlets 0; stamens ± 25; pistils 1–5(12), simple, styles persistent, ± hairy
Fruit: achene, ± fusiform to oblong
Species in genus: ± 5 species: w North America
Etymology: (Frederick T. Pursh, North America flora author, 1774–1820)
Reference: [Koehler & Smith 1981 Madroño 28:13–25; Henrickson 1986 Phytologia 60:468]


P. tridentata (Pursh) DC.

Shrub 10–50 dm
Leaf: lobes 3(–5), generally from above middle, generally entire
Flower: hypanthium ± 3–4 mm; sepals ± 3 mm, ± oblong; petals 6–8 mm, ± obovate, cream to yellow; pistils 1(–3)
Fruit canescent; style < 1 cm, canescent at least below tip
Ecology: Dry sagebrush scrub, chaparral, Joshua-tree or pinyon/juniper woodland, coniferous forest
Elevation: 700–3400 m.
Bioregional distribution: Klamath Ranges, High North Coast Ranges, Cascade Range, High Sierra Nevada (e slope), Tehachapi Mountain Area, n Transverse Ranges and e Peninsular Ranges (Desert edge), Great Basin Floristic Province, Desert Mountains
Distribution outside California: to British Columbia, Montana, New Mexico
Varieties intergrade.

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