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|Family: Rosaceae||View Description||Dichotomous Key|
|Genus: Rosa||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Rosa spithamea S. Watson
Habit: 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. Chromosomes: 2n=28.
Ecology: Open forest, chaparral, especially after fire; Elevation: generally 150--1550(1950) m. Bioregional Distribution: NW, CW, MP; Distribution Outside California: Oregon. Flowering Time: Apr--Aug Note: Generally blooms after fires. Plants in southern CW with larger prickles, described as Rosa granulata Greene, may be hybrids with Rosa californica; study needed.
Synonyms: Rosa spithamea var. sonomensis (Greene) Jeps.
Unabridged Note: The author has indicated that the disjunct MP site is at 1950 m.
eFlora Treatment Author: Barbara Ertter
Jepson Online Interchange
Previous taxon: Rosa rubiginosa
Next taxon: Rosa woodsii
Citation for this treatment: Barbara Ertter 2017. Rosa spithamea, Revision 2, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=41696, accessed on February 26, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 26, 2017.