7 i_R 0 SA GYMNOCARPA Nutt. 
/vosa gymnocarpa : caiile debili, valde ramoso ; aculeis inaequalibus, multis, 
gracilibiis, rectis, saepe geminis infrastipularibus ; foliolis 5-7, obovatis, parvis, 
obtusis, diiplicato-serratis, rigidiilis, viridibus, iitrinque glabris ; rhachi glabra, 
aciculata ; stipulis adnatis, glanduloso-ciliatis, apicibus liberis, ovatis, parvis ; 
floribiis saepissime solitariis ; pedicellis nudis vel hispidis ; calycis tubo oblongo, 
nudo ; lobis parvis, ovatis, simplicibus ; petalis rubellis, parvis ; stylis liberis ; 
fructu parvo, ovoideo, nudo, rubro ; pedicellis cernuis ; carpellis paucis ; sepalis 
caducis. 
R. gymnocarpa Nuttall ex Torrey & Gray, FI. N. Am. vol. i. p. 461 (1840). — 
Presl, Epimel. Bot. p. 203 (1849). — Torrey, U. S. and Mex. Boimd. Survey, vol. ii. 
p. 64, t. 21 (1859). — Crdpiii in Bull. Soc. Bot. Belg. vol. xv. p. 72 {Primit. Monogr. 
Ros. fasc. iv. p. 433) (1876). — S. Watson in Brewer & Watson, Bot. Calif, vol. i. 
p. 187 (1876) ; Proc. Ainer. Acad. vol. xx. p. 350 (1885). — Coulter, Man. Bot. Rocky 
Mount, p. 88 (1885). — Rehder in Bailey, Cycl. Am. Hort. vol. iv. p. 1554 (1902). — 
Piper in Contrib. U. S. Nat. Herb. vol. xi. p. 334 [FI. State of IVashington) 
(1906). 
R. spithamea, var. subinermis Engel man n in Bot. Gaz. vol. vi. p. 236 (1881). 
Stems weak, much branched ; prickles numerous, unequal, slender, straight, 
spreading, often in infrastipular pairs. Leaflets 5-7, small, obovate, obtuse, green, 
rather rigid, doubly toothed, glabrous on both surfaces ; petioles glabrous, aciculate ; 
stiptdes adnate, narrow, gland-edged, with small ovate free tips. Flowers usually 
solitary ; pedicels naked or hispid. Calyx-tube oblong, naked ; lobes ovate, simple, 
j-i in. long, naked on the back. Petals small, pink. Styles free. Fruit small, 
ovoid, bright red, naked, with few carpels, cernuous pedicels and deciduous sepals. 
Rosa gymnocarpa was first found in British Columbia by David 
D ouglas in 1824-5, afterwards in Oregon by Nuttall, who wrote 
the description incorporated in Torrey & Gray’s Flora. It inhabits 
California, and extends northward to British Columbia and eastward 
to Idaho, Montana and Oregon. It resembles the European Rosa 
spinosissi 7 na L. in its dwarf habit, small, obtuse leaflets, small, solitary 
flowers, and abundant, unequal, slender prickles, but the prickles are 
often m infrastipular pairs, the leaflets are fewer and doubly toothed, 
and the fruit is very different. It also bears some resemblance to Rosa 
Beggeriana Schrenk. The flowers are very small, slightly involute, 
pale pink, deepening in colour on the edges of the petals. Albino 
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