ROSE FAMILY 125 



Bractlets longer than the sepals; hypantliium and sepals usually strongly purple- 

 tinged. 4. S. cihata. 

 Bractlets shorter than the sepals; hypanthium and sepals yellowish and only slightly 

 purple-tinged. 

 Leaflets, e.xcept in depauperate soecimens, 2-4 cm. long, ascending, scarcely 



glandular. 5. S. flavula. 



Leaflets less than 1.5 cm. long, spreading, conspicuously glandular-pruinose and 

 hirsute. 6. S. brevifolia. 



28. ACOMASTYLIS Greene. 



Loaves densely silky-canescent. 1. A. sericea. 



Leaves puberulent, somewhat glandular-granuliferous or glabrate, not silky. 



2. A. turbinata. 



29. FALLUGIA Endl. Apache Plume. 1. F. paradoxa. 



30. COWANIA D. Don. Cliff Rose. l. c. Stansburiana. 



31. PURSHIA DC. I. P. tridentata. 



32. CERCOCARPUS H.B.K. Mountain Mahogany. 



Leaves serrate or dentate. 



Hypanthium and leaves villous, with spreading hairs; leaves broadly obovate, 1.5-3 



cm. long. 1. C. montanus. 



Hypanthium and leaves appressed-silky. 



Leaves obovate-flabelliform, 1-2 cm. long. 2. C. flabullifolius . 



Leaves oblanceolate or obovate, 2-4 cm. long. 3. C. argenteus. 



Leaves entire, from linear to elliptic, coriaceous, with moie or less revolute margins, 

 resinous. 

 Leaf-blades 1.5-3 cm. long; tail of fruit 4-6 cm. long. 



Leaf-blades elliptic, only slightly revolute, in age merely tomentulose beneath ; 



petioles 3-5 mm. long. 4. C. IcdifoUus. 



Leaf-blades linear, strongly revolute, permanently white villous-tomentose be- 

 neath; petioles 1-2 mm. long. 5. C. hypoleucus. 

 Leaf-blades 5-15 mm. long, narrowly linear, strongly revolute, only the midrib of the 

 lower surface exposed; tail of fruit 3-4 cm. long. 

 Leaves short-villous when young. 6. C. arizonicus. 

 Leaves glabrous from the beginning. 7. C. intricatus. 



33. RUBACER Rydb. Flowering Raspberry, Thimbleberry, Salmon 

 Berry. l. R. parviflorum. 



34. OREOBATUS Rydb. l. O. deliciosus. 



35. RUBUS (Tourn.) L. Raspberry, Blackberry, Cloudberry. 



stem herbaceous, never prickly, rarely bristly; floral branches directly from the root- 

 stock or from stolons; stipules broad, free or nearly so. 

 Petals spreading or ascending; filaments not dilated. 



Plants dioecious; drupelets many, coherent; petals large and broad; leaves merely 

 lobed. 1. R. Chamnemorus. 



Plants with perfect flowers; drupelets few, distinct; petals narrow; leaves pedately 

 5-foliolate. 2. R. pedatus. 



Petals erect; filaments dilated. 



Petals pink or rose-color; plants not stoloniferous ; floral branches directly from 

 the rootstock. 

 Petals oblanceolate or obovate, 10-15 mm. long, distinctly clawed; stem less 

 than 1 dm. high, usually 1-flowered; leaflets rounded at the ape.x. 



3. R. acaulis. 

 Petals broadly obovate, rounded or emarginate, scarcely clawed, 10 mm. long 

 or less; stem leafy, 1-3 dm. high, 1-5-flowered; stem-leaves with rhombic 

 acute leaflets. 4. R. arcticus. 



Petals wliite; plant stoloniferous. 



Plant wholly unarmed; flowers solitary or racemose. 5. R. pubescens. 



Plant sparingly glandular-hispid above and sometimes with a few weak bristles ; 

 flowers corymbose. 6. R. transmontanus. 



Stem more or less woody, biennial oi perennial, usually prickly or bristly, if unarmed or 

 merely bristly, then the stipules narrow and more or less adnate. 

 Stipules broad, free or nearly so; stem decumbent, prickly. 7. R. nivalis. 



Stipules narrow, linear-lanceolate or subulate, adnate to the petioles. 



Carpels imited into a tliimble-shaped aggregate fruit, separating from the dry 

 receptacle. 

 Flowers solitary or few; petals purplish, large, much exceeding the sepals; 



leaves green on both sides. 8. .R. spectabilis. 



Flowers clustered; petals white, usually shorter than the sepals; leaves more 

 or less tomentose or at least glaucous beneath. 

 Inflorescence corymbiform; fruit black or purple; stem piickly; leaves, 

 when having more than 3 leaflets, pedately compound. 



