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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

DUCHESNEA

Barbara Ertter

Perennial herb, stoloned; glands not evident. Leaf: basal and on stolons, ternately compound; leaflets often double-toothed. Inflorescence: flowers 1 in axils on leafy stolons; pedicel bractlets 0. Flower: hypanthium shallow-cup-shaped, bractlets 5, generally wider than sepals; petals yellow; stamens 20, filaments slender, anthers with paired pollen sacs; pistils many, ovary superior, style slender, attached below fruit tip. Fruit: ± strawberry-like; receptacle enlarged, red, ± completely covered with achenes.
2 species: southeastern Asia. (A.N. Duchesne, French botanist, 1747–1827)

Previous taxon: Drymocallis rhomboidea
Next taxon: Duchesnea indica var. indica

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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 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Duchesnea, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11229, accessed on Nov 22 2014

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