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Key to families | Table of families and genera

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ROSACEAE ROSE FAMILY

Daniel Potter & Barbara Ertter, family description, key to genera; treatment of genera by Daniel Potter, except as noted

Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0–3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0–5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5–many, anther pollen sacs generally 2; pistils (0)1–many, simple or compound, ovary superior to inferior, styles 1–5. Fruit: 1–many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1–5 stones. Seed: generally 1–5 (per fruit, not per flower).
110 genera, ± 3000 species: worldwide, especially temperate; many cultivated for ornamental, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. [Potter et al. 2007 Plant Syst Evol 266:5–43] Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis. —Scientific Editors: Daniel Potter, Thomas J. Rosatti.
Unabridged references: [Robertson 1974 J Arnold Arbor 55:303–332, 344–401, 611–662]

Key to Rosaceae

PURSHIA

Brian Vanden Heuvel & Thomas J. Rosatti

Shrub. Leaf: ± clustered on short-shoots, simple, persistent or drought-deciduous, generally deeply 3–9-lobed, generally with ± sunken glands adaxially, margin generally not toothed, ± strongly rolled under; bases persistent, overlapping, sheathing stem. Inflorescence: flowers generally 1 on short-shoots. Flower: hypanthium ± funnel-shaped, outside hairy, partly glandular or not, bractlets small, lanceolate; sepals 5, overlapping; petals 5, white to cream [yellow]; stamens (15)20–80(125); pistils 1–7(10), simple. Fruit: achene, ± fusiform to oblong, styles persistent, ± hairy.
6 species: southwestern United States, northern Mexico. (Frederick T. Pursh, North American botanist, 1774–1820)
Unabridged etymology: (Frederick T. Pursh, North American botanist, author of Flora Americae Septentrionalis, 1774–1820)
Unabridged references: [Koehler & Smith 1981 Madroño 28:13–25; Henrickson 1986 Phytologia 60:468]

Key to Purshia

P. tridentata (Pursh) DC. BITTERBRUSH
NATIVE
Plant 2–25(40) dm. Leaf: lobes 3(5), central generally spiny at tip, lateral from generally above middle. Flower: hypanthium ± 2.5–5 mm; sepals 2–4 mm; petals 4–8 mm, ± obovate; pistils 1–2. Fruit: canescent; style 5–7(10) mm, not plumose. [Online Interchange]

Previous taxon: Purshia stansburyana
Next taxon: Purshia tridentata var. glandulosa

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Nov 27 2014
Citation for this treatment: [Author of taxon treatment] 2013. Purshia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=77219, accessed on Nov 27 2014

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Geographic subdivisions indicated for the distribution of Purshia tridentata Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(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).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.