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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

CRATAEGUS HAWTHORN

James B. Phipps

Shrub, tree, thorny. Leaf: simple, alternate, petioled, ± ovate, generally ± lobed above middle, toothed, deciduous. Inflorescence: panicle on short-shoot tips, domed; pedicel bractlets several to many, ± 5 mm, narrow, margins glandular. Flower: hypanthium urn-shaped, bractlets 0; sepals small, margins entire to finely toothed, generally glandular; petals white; stamens ± 10 or 20; ovary inferior, styles 1–5, free. Fruit: pome, drupe-like, red to black, generally lighter in color before fully mature, core of 1–5 laterally pitted stones [or not]; sepals reflexed [or not].
± 200 species: northern temperate. (Greek: hard, for wood) [Phipps & O'Kennon 2002 Sida 20:115–144] Several species cultivated, escaped.
Unabridged note: Various species cultivated in arboreta, escaped elsewhere; several species in retail commerce, e.g., Crataegus ×media Sarg. cvs (generally misnamed as Crataegus laevigata (Poir.) DC. or Crataegus oxyacantha L.), Crataegus monogyna cvs, Crataegus phaenopyrum (L. f.) Medik.

Key to Crataegus

Previous taxon: Cotoneaster simonsii
Next taxon: Crataegus castlegarensis

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 1 2014
Citation for this treatment: [Author of taxon treatment] 2013. Crataegus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11225, accessed on Sep 1 2014

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