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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

ROSA

Barbara Ertter

Shrub to vine, often thicket-forming, generally prickly. Leaf: generally odd-pinnately compound; stipules generally attached to petiole, generally gland-margined. Inflorescence: generally ± cyme or flowers 1; pedicel bractlets 0. Flower: hypanthium urn-shaped, bractlets 0; sepals often with long expanded tip; petals generally 5 (except cultivated), generally pink in California (white to red or yellow); stamens generally > 20; pistils generally many, ovaries superior, styles attached at tip, generally hairy. Fruit: bony achenes generally enclosed in fleshy, generally ± red hypanthium (hip).
100+ species: generally northern temperate. (Latin: ancient name) [Ertter & Lewis 2008 Madroño 55:170–177] Species hybridize freely; other non-natives established locally. FNANM treatment by Lewis & Ertter uses both subspecies and varieties, the latter mostly reserved for localized variants within a subsp.
Unabridged references: [Lewis & Ertter 2007 Novon 17:342–353]

Key to Rosa

R. californica Cham. & Schltdl. CALIFORNIA ROSE
NATIVE
Shrub or thicket-forming, 8–25 dm. Stem: prickles few to many, paired or not, 3–15 mm, thick-based and compressed, generally curved (straight). Leaf: axis ± shaggy-hairy (± glabrous), hairs to 1 mm, glandless or glandular; leaflets 5–7(9), ± hairy, sometimes glandular; terminal leaflet generally 15–50 mm, ± ovate-elliptic, generally widest at or below middle, tip rounded to acute, margins single- or double-toothed, glandular or not. Inflorescence: (1)3–30(50)-flowered; pedicels generally ± 5–20 mm, generally ± hairy, glandless. Flower: hypanthium 3–5.5 mm wide at flower, glabrous to sparsely hairy, glandless, neck 2–4.5 mm wide; sepals glandular or not, entire, tip generally ± = body, entire; petals generally 15–25 mm, pink; pistils 20–40. Fruit: generally 8–15(20) mm wide, generally (ob)ovoid; sepals generally erect, persistent; achenes generally 3.5–4.5 mm.
n=14. Generally ± moist areas, especially streambanks; < 1800 m. California Floristic Province (except High Cascade Range, High Sierra Nevada, Tehachapi Mountain Area); southern Oregon, northern Baja California. Variable; needs study. Feb–Nov [Online Interchange]
Unabridged note: The author has indicated that all range and most elevation extension vouchers now have been annotated as other species

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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 21 2014
Citation for this treatment: [Author of taxon treatment] 2013. Rosa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=41631, accessed on Sep 21 2014

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click for enlargement Rosa californica
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2003 Lynn Watson

Geographic subdivisions indicated for the distribution of Rosa californica 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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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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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.