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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

COTONEASTER

Peter F. Zika

Shrub, tree, unarmed; evergreen or deciduous. Leaf: simple, stipuled, petioled, entire. Inflorescence: flowers 1 or clustered at branch tips; pedicel bractlets 0. Flower: hypanthium bractlets 0; sepals persistent; petals clawed, erect, pink to ± red or rose, at least near base, or spreading, white; stamens 8–21, anthers darker after flower; ovary inferior, 2–5-chambered, styles 2–5, free. Fruit: pome, drupe-like, generally orange to red, stones 2–5.
± 400 species: eastern hemisphere; many ornamental. (Latin: quince-like, possibly from leaf shape) [Fryer & Hylmö 2009 Cotoneasters. Timber Press] 2 subgenera, 1 with petals erect, pink to ± red (flower length important), 1 with petals spreading, white (flower width important).
Unabridged references: [Fryer & Hylmö 1998 New Plantsman 5:132–144; Fryer & Hylmö 2009. Cotoneasters: A Comprehensive Guide to Shrubs for Flowers, Fruit, and Foliage. Timber Press, Portland, OR. 344 p.]

Key to Cotoneaster

C. horizontalis Decne. WALL or HERRINGBONE COTONEASTER
NATURALIZED
Shrub 0.5–1 m; deciduous. Leaf: blade 4–14 mm, generally widely elliptic, abaxially sparsely appressed hairy, adaxially ± glabrous, shiny, tip acute. Flower: 5–7 mm; petals erect, pink to ± red; stamens 8–11, filaments dark red, anthers white; styles generally 2–3. Fruit: 4–7 mm, 6–7 mm wide, widely ovate to ± spheric, red; stones generally 2–3.
2n=68. Thickets, brushy slopes, pasture edges; < 100 m. North Coast; to British Columbia; native to China. Apr–May, fruiting Sep–Mar [Online Interchange]

Previous taxon: Cotoneaster hodjingensis
Next taxon: Cotoneaster integrifolius

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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. Cotoneaster, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=20512, accessed on Apr 18 2014

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Bioregions in which Cotoneaster horizontalis 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.