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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

SORBUS MOUNTAIN ASH

Peter F. Zika

Shrub, tree. Leaf: odd-1-pinnately compound [not], petioled, deciduous; leaflets generally toothed, terminal partly fused to uppermost lateral(s) or not. Inflorescence: panicle, many-flowered; pedicel bractlets 0. Flower: hypanthium bractlets 0, stamens generally 20; ovary generally inferior, chambers 1–5, styles 1–5, generally free. Fruit: pome, generally spheric, chambers 1–5, 1–2-seeded.
± 130 species: northern temperate, tropical Asia. (Latin: ancient name) Species intergrade.
Unabridged references: [Jones 1939 J Arnold Arbor 20:1–43]

Key to Sorbus

S. sitchensis M. Roem.
NATIVE
Shrub 1–4 m; stem-buds 8–13 mm, glaucous, not shiny, not sticky, hairs evenly distributed, red-brown. Leaf: leaflets 7–13, 2–6 cm, 0.8–2.5 cm wide, ovate to oblong, dull adaxially, axillary hairs red-brown. Inflorescence: pedicels glabrous or ± red-brown-hairy. Flower: petals 3–5 mm, ovate to diamond-shaped. Fruit: 7–13 mm, red, glaucous. Seed: 3.5–5 mm, ovate to elliptic, ± flat, red-brown.
2n=34,68. [Online Interchange]

S. sitchensis var. grayi (Wenz.) C.L. Hitchc. DWARF or GRAY'S MOUNTAIN ASH
NATIVE
Leaf: lateral leaflets ± entire or toothed above middle. Flower: petals white or ± pink.
2n=34. Ridgelines; 1500–1700 m. c Klamath Ranges (w Siskiyou Co.); to Alaska. Jun–Sep [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Apr 18 2014
Citation for this treatment: [Author of taxon treatment] 2012. Sorbus, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=66577, accessed on Apr 18 2014

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Bioregions in which Sorbus sitchensis var. grayi 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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CCH collections by month

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