Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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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bioregional map for PURSHIA%20tridentata being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Purshia tridentata
Retrieve dichotomous key for Purshia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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