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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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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
Annual to perennial herb; odor generally 0. Leaf: generally basal, odd-1-pinnately, 1-palmately, or 1-ternately compound; leaflets 1–8(13) per side, ± toothed, generally ± separated, terminal generally ± = lateral; margins generally flat. Inflorescence: generally cyme, generally ± open; pedicels generally ± straight, bractlets 0. Flower: hypanthium ± shallow, bractlets generally 5, generally < sepals, generally flat; sepals ± triangular; petals (2)4–20 mm, >= sepals, generally ± widely obcordate, generally yellow; stamens 10–25; pistils generally > 10, ovaries superior, styles slender to ± tapering, generally attached near fruit tip. Fruit: achene, generally glabrous.Key to Potentilla
± 400 species: mostly northern temperate, arctic. (Latin: diminutive of powerful, for reputed medicinal value) Other taxa in TJM (1993) moved to Comarum, Dasiphora, Drymocallis.
Plant tufted from ± branched caudex, ± glandular. Stem: ascending to erect, 8–25 cm, densely short-spreading-hairy, more sparsely long-hairy. Leaf: pinnate, petiole generally < blade; basal generally 3–13 cm, leaflets generally 3–6 per side, larger 10–25 mm, ± elliptic-oblanceolate, ± evenly 9–13-toothed ± 3/4 to midvein, densely short-hairy abaxially, sparser adaxially; margins ± rolled under. Inflorescence: ± 3–10-flowered. Flower: hypanthium 3–5 mm wide, bractlets ± = sepals, margins ± rolled up, petals 3–5 mm; filaments 0.5–2 mm, anthers 0.5–0.9 mm; styles ± 1 mm, tapered from rough-thickened base. Fruit: 1–1.5 mm, ± veined, ± brown.
2n=28. Rocky alpine barrens; 2700–3800 m. c&s High Sierra Nevada, White and Inyo Mountains; North America, Eurasia. Jul–Aug [Online Interchange]
Previous taxon: Potentilla norvegica
Next taxon: Potentilla pseudosericea
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 21 2014
Citation for this treatment: [Author of taxon treatment] 2012. Potentilla, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=39770, accessed on Apr 21 2014
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|Bioregions in which Potentilla pensylvanica occurs|| 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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