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-foliolate; 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-foliolate; flowers in small terminal and axillary racemes; peduncles, pedicels, 

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

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

 strigosus of Western reports. B. laetissima, B. dacotica, B. unicolor, and B. Sand- 

 bergii Greene. RED RASPBERRY. Mountains: B.C. Alta. Colo. Utah Ore. 

 Submont. Mont. Je-Jl. 



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

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

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

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

 incisedly double-toothed, abruptly acuminate, densely white-tpmentose beneath, 

 2-4 cm. long; leaves of the floral branches always 3-foliolate, 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. melanolasius. B. 

 acalyphacea, B. subcordata, B. cataphracta, and B. filipendula Greene. Moun- 

 tains: Mont. Wyo. Ida. Nev. 



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

 ing 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. CREEPING BLACKBERRY. 

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



36. ROSA (Tourn.) 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, ellipsoid 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 column. Achenes bony. 



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



in fruit erect or ascending, persistent. 

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



but not prickly. 

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



suffruticose; 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. Lunellii. 

 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 corymbose flowers at the end of lateral branches; 



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



