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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. spithamea S. Watson COAST GROUND ROSE
NATIVE
Dwarf shrub, openly rhizomed, generally < 5 dm. Stem: prickles few to many, generally not paired, 3–8(12) mm, generally slender (thick-based), ± straight. Leaf: axis generally glabrous (finely hairy), glandular; leaflets 5–7(9), 2–4 per side, (±) glabrous; terminal leaflet ± 10–30 mm, ± widely elliptic (obovate), widest near middle, tip obtuse to truncate, margins ± double-toothed, glandular. Inflorescence: 1–10-flowered; pedicels generally 5–15 mm, glabrous, ± stalked-glandular. Flower: hypanthium generally 4–5 mm wide at flower, stalked-glandular, neck 3–4 mm wide; sepals generally glandular, entire, tip generally ± = body, entire; petals 10–15 mm, pink to red; pistils 10–20. Fruit: 7–12(15) mm wide, ± spheric; sepals ± erect, persistent; achenes 3.5–5 mm.
2n=28. Open forest, chaparral, especially after fire; generally 150–1550(1950) m. Northwestern California, Central Western California, Modoc Plateau; Oregon. Generally blooms after fires. Plants in southern Central Western California with larger prickles, described as Rosa granulata Greene, may be hybrids with Rosa californica; study needed. Apr–Aug [Online Interchange]
Unabridged note: The author has indicated that the disjunct Modoc Plateau site is at 1950 m.

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 30 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=41696, accessed on Oct 30 2014

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click for enlargement Rosa spithamea
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2001 Jeff Abbas

Geographic subdivisions indicated for the distribution of Rosa spithamea 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.