ROSACES. (ROSE FAMILY.)* 125 



the lowest ones 5-lobed, the lobes acute or acuminate, toothed and serrate ; calyx- 

 lobes caudate ; flowers large, rose-color ; fruit reddish. Rocky woods on the 

 mountains of Georgia, and northward. June - August. Stem 3 - 4 high. 

 Flowers 2' in diameter. 



2. B. occidentalis, L. Glaucous ; stem prickly, but otherwise very 

 smooth, bending ; leaves 3 - 5-foliolate ; leaflets thin, ovate, acuminate, coarsely 

 serrate or sparingly toothed, white-downy beneath ; petals white, shorter than the 

 reflexed short-caudate hoary calyx-lobes ; fruit black. Borders of woods along 

 the mountains, Georgia and northward. May. Stem biennial, 5 - 8 long. 



* * Heads of achenia oval or oblong, persistent : receptacle juicy. 



3. B. villosus, Ait. Tall, shrubby; stem erect or bending, armed, like 

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

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

 rate ; 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. B. cuneifolius, Pursh. Shrubby, armed with stout prickles; stem 

 erect ; branches and leaves tomentose ; leaves trifoliolate, with the leaflets cune- 

 ate-obovate, unequally serrate towards the summit, tomentose and white beneath ; 

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

 North Carolina, and westward. April. Stem 2 - 4 a high. Leaves and fruit 

 smaller than in the preceding. 



5. B. trivialis, Michx. Shrubby, and armed with stout straight or re- 

 curved 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, Florida to North Carolina, and westward. 

 April. 



6. B. 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. obo- 

 valis, Michx.) Cold shady swamps among the mountains, Georgia and north- 

 ward. May and June. Fruit sour. 



14. BOSA, 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. B. setigera, Michx. Stem long, reclining, smooth ; leaflets 3 - 5, ovate, 

 acuminate or acute, serrate, shining above : petioles, peduncles, and calyx glan- 

 11* 



