ROSE FAMILY 439 



folia Greene. Perhaps not distinct from the next. Woods: Alaska — Mack. — 

 Mont. — B.C. Submont. Je-Jl. 



14. R. melanolasius Focke. Stems biennial, erect, 0.5-1 m. high, purple, 

 or yellow, and often glaucous, densely bristly and more or less glandular; leaves 

 of the shoots pinnately 3-5-f oliolate ; leaflets ovate or lanceolate, short-acuminate 

 or acute at the apex, usually rounded or cuneate at the base, sharply double- 

 serrate, light green and sparingly and minutely pubescent above, finely and 

 densely white-tomentose beneath; leaves of the floral branches similar, but always 

 3-f oliolate; flowers in small terminal and axillar}^ racemes; peduncles, pedicels, 

 hypanthium, and calyx densel^^ bristly and glandular-hispid; petals white, elliptic, 

 5-6 mm. long, erect; fruit red or purplish red, hemispheric, very sour. R, 

 slrigosus of Western reports. B. laetissima, B. dacotica, B, unicoJor, and B. Sand- 

 hergii Greene. Red Raspberry. Mountains: B.C. — Alta. — Colo. — Utah — Ore. 

 Submont, — Mont, Je-Jl. 



15. R. acalyphaceus (Greene) Rydb. Stem biennial, erect, 0.5-1 cm. high, 

 brown or purple, in age exfoUating, tomentose or pilose as well as densely armed 

 with strong bristles often flattened; leaves of the shoot pinnately, 3-5-f oliolate ; 

 leaflets ovate or the terminal subcordate, rather prominently veined and plicate, 

 incisedly double-toothed, abruptly acuminate, densely w^hite-tomentose beneath, 

 2-4 cm. long; leaves of the floral branches always 3-foholate, with shorter leaflets; 

 flowers in short few-flowered racemes; petals white, erect, about 5 mm. long; 

 fruit red, acid, hemispheric. Perhaps not distinct from R, melanolasnis. B. 

 acalyphacea, B. subcordata, B. cataphractaj and B. flipendida Greene. Moun- 

 tains: Mont. — Wyo. — Ida.— Xev. 



16. R. macropetalus Dougl. Stem biennial, terete, often purplish, climb- 

 mg or decumbent, sparingly hirsute or glabrous, armed with small, slightly 

 retrorse prickles; leaves ternate; terminal leaflet broadly ovate or subcordate, 

 often more or less lobed, double-serrate, green and sparingly hirsute on both 

 sides; lateral leaflets ovate, subsessile; inflorescence corymbose, armed with weak 

 prickles and slightly glandular; petals of the staminate flowers 12-16 mm. long, 

 elliptic, white, those of the essentially pistillate flowers oval, 7-10 mm. long; 

 fruit hemispheric or slightly elongate, black, sweet. Creepixq Blackberry. 

 Low woods: B.C. — Ida.— n Calif. Submont, My-Je, 



36. ROSA (Tom-n.) L. Rose. 



Shrubs or vines, usually prickly. Leaves alternate, pinnate, with more or 

 less adnate stipules, and serrate leaflets. Flowers perfect, solitary or corymbose. 

 Hypanthium well-developed, urceolate, globose, eUipsoid or turbinate, contracted 

 at the mouth, enclosing the achenes, becoming fleshy in fruit. Sepals 5 (rarely 

 4), with or without bractlets. Petals normally 5 (rarely 4), or by the transforma- 

 tion of the stamens numerous, spreading, usually obcordate. Stamens numer- 

 ous, inserted on the thickened margin of the hypanthium. Pistils numerous or 

 several, inserted in bottom of the hypanthium or also on the inside walls of the 

 same. ^ Styles ventral, reaching the mouth of the hypanthium or long-exserted, 

 sometimes united into a colimin. Achenes bony. 



Pistils numerous; styles as well as the upper part of the hypanthium persistent; sepals 



in fniit erect or ascending, persistent. 

 Infrastipular prickles not present; branches mostly unarmed and young siioots bristly, 



but not prickly. 

 Inflorescence corymbose, terminating the stems (or rarely the branches) ; plant 



suflf ruticose ; stem usually dying back to near the ground; leaflets 9-11. 

 Leaves glabrous or nearly so. 



Leaflets mostly 2-5 cm. long, not glaucous, decidedly acute; plant .3 dm. 



high or more; flowers corymbose. 1. R. arkansana. 



Leaflets rarely more than 2 cm. long, mostly rounded at the apex, some- 

 what glaucous beneath; plant 1-2 dm. high; flowers 1-3. 



2. R. LuneUii, 



Leaves densely pubescent, especially beneath. 



Upper stipules and bracts not densely glandular; leaflets 1.5-4 cm. long; 



plant 3-5 dm. high. 3. R. suffulta. 



Upper stipules and bracts densely glandular; leaflets seldom more than 

 1.5 cm. long; plant 1-3 dm. high. 4. R. alcea. 



Inflorescence of solitary or few cor^mibose flowers at the end of lateral branches; 



plant shrubby; leaflets usually 5 or 7, or 9 only on the young shoots. 



