KOSACE.E. (KUSE FAMILY.) 137 



2. R. OCCidentalis, L. Glaucous; stem prickly, but otherwise very 

 smooth, bending ; leaves 3 - 5-fuliolate ; leaflets thiii, ovate, acuminate, 

 coarsely serrate or sparingly toothed, white-downy beneath ; petals white, 

 shorter thaii the reflexed short-caudate hoary calyx lobes; fruit black - 

 15orders of woods along the mountains. May. Stem biennial, 5 -8 long. 



* * Heads ofachenia oval or oblong, persistent: receptacle juicy. 



3. R. villoSUS, Ait. Tall, shrubby ; stem erect or bending, armed, like 

 the petioles and peduncles, with stout recurved prickles, the branches and 3 - 7- 

 foliolate leaves soft-hairy or nearly smooth ; leaflets ovate or oblong, doubly 

 serrate ; racemes leafy below, bracted above ; sepals acuminate, much shorter 

 than the obovate white petals; fruit large, oblong, black. .Swampy thickets, 

 common. April. Stem 4- 10 high. 



4. R. CUneifolius, Pursh. Shrubby, armed with stout prickles; stem 

 erect ; branches and leaves tomeutose ; leaves trifoliolate, with the leaflets 

 cuneate-obovate, unequally serrate towards the summit, tomentose and white 

 beneath; racemes few-flowered ; petals white; fruit ovoid, black. Old fields. 

 April. Stem 2 -4 high. Leaves and fruit smaller than in the preceding. 



5. R. tl'ivialis, Michx. Shrubby, and armed with stout straight or 

 recurved prickles and bristly hairs; stem prostrate, slender; leaves 3-5- 

 foliolate, partly persistent ; leaflets smooth, oblong-ovate or obovate, acute, 

 sharply serrate ; racemes few-flowered, leafy below, mostly longer than the 

 leaves; flowers large, white ; fruit black. Dry sandy soil. April. 



6. R. Canadensis, L. Stem shrubby at the base, slender, trailing, the 

 prickles few and scattered; leaves mostly 3-foliolate; leaflets smooth, thiii, 

 oval or oblong, coarsely and unequally serrate ; racemes few-flowered, leafy ; 

 fruit large, roundish, black. Dry sterile soil, North Carolina and Tennessee. 

 May. 



7. R. hispidus, L. Somewhat shrubby, and armed with weak bristle- 

 like prickles ; stem slender, prostrate ; leaves trifoliolate, persistent : leaflets 

 obovate, obtuse, coarsely serrate, smooth ; racemes many-flowered, slender, 

 longer than the leaves; flowers small, white; fruit of few large and black 

 achenia. (R. obovalis, ^ficli.r.) Cold shady swamps among the mountains. 

 May- June. Fruit sour. 



15. ROSA, Tourn. ROSE. 



Calyx 5-cleft, the urn-shaped tube becoming fleshy in fruit. Petals 5. Sta- 

 mens numerous, inserted with the petals on the throat of the calyx. Ovaries 

 numerous, hairy, inserted on the thin receptacle that lines the inner surface 

 of the calyx-tube. Styles nearly included. Achenia bony. Prickly shrubs. 

 Leaves unequally pinnate. Stipules united with the petioles. Flowers showy. 



* Styles cohering, exserted. 



1. H. setigera, Michx. Stem long, reclining, smooth; leaflets 3-5, 

 ovate, acuminate or acute, serrate, shining above ; petioles, peduncles, and 

 calyx glandular ; corymb few-flowered ; petals obcordate ; fruit globose, 

 smooth. Borders of swamps, chiefly in the upper districts. June. Stem 

 1 - 1 5 long. Flowers 2' - 3' wide, "red. 



