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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
1 sp. (Greek: fruit of Arbutus unedo) [Ertter 2007 J Bot Res Inst Texas 1:31–46]
Perennial herb, nonglandular, openly matted. Stem: non-flowering portion creeping, often floating and/or rooting at nodes; flower-stem erect to ascending, 20–50 cm, ± glabrous to ± strigose. Leaf: alternate, odd-1-pinnate to subpalmate, 5–20 cm; leaflets 2–3 per side, toothed, terminal generally ± = lateral, 15–70 mm, oblanceolate-elliptic, distal 1/3 toothed ± 1/4 to midvein, ± glabrous to sparsely strigose. Inflorescence: cyme, ± open, generally < 10-flowered; pedicels straight. Flower: hypanthium ± shallow, 5–10 mm wide; bractlets 5; sepals ± triangular; petals << sepals, 2–6 mm, ± ovate to elliptic, dark red; stamens 20–25, filaments 1.5–2.5 mm, anthers 1–1.5 mm, pollen sac 1, horseshoe-shaped; pistils many, ovaries superior, styles 0.8–2 mm, slender, jointed laterally to fruit. Fruit: achene, 1–1.5 mm, glabrous, glossy, ± brown, sometimes remaining attached to spongy receptacle.
2n=28,42–64. Bogs, marshes; < 2400 m. North Coast, High Cascade Range, n High Sierra Nevada, Sacramento Valley, Warner Mountains; circumboreal. [Potentilla palustris (L.) Scop.] May–Aug [Online Interchange]
Previous taxon: Comarum
Next taxon: Cotoneaster
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 17 2014
Citation for this treatment: [Author of taxon treatment] 2012. Comarum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=20069, accessed on Apr 17 2014
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