ROSACES. 223 



with retrorse bristles ; leaves 3-foliate ; leaflets obovate, mostly obtuse, 

 smooth, entire toward the base, coarsely serrate ; peduncles corymbose, with 

 several flowers, often bristly ; flowers small, white ; petals obovate. Fruit 

 small, dark purple, or blackish, sour. May- June. 



3. R. ID.EUS {Garden Raspberry}. Stem hispid; leaves pinnately 3-5- 

 foliate ; leaflets broad-ovate, unequally serrate, hoary -torn entose beneath ; 

 flowers white, corymbosely paniculate ; petals entire, shorter than the tomen- 

 tose, acuminate calyx. Fruit red. May. 



4. R. STRIGOSUS (Raspberry). Stem unarmed, shrubby, strongly hispid ; 

 leaves pinnately 3-5-foliate ; leaflets oblong-ovate, acuminate, serrate, hoary- 

 tomentose beneath ; peduncles 3-6-flowered, hispid ; petals white. Fruit 

 light red, juicy, of a peculiar and very pleasant flavor. May. 



5. R. OCCIDENTALS (Black Raspberry). Stem shrubby, glaucous, armed 

 with hooked prickles ; leaves pinnately 3-foliate ; leaflets ovate, coarsely and 

 doubly serrate, hoary-tomentose beneath ; peduncles i-3-flowered, with short 

 pedicels ; petals white. Fruit dark purple, covered with a glaucous bloom, 

 pleasant flavor. May. 



10. Rosa. Calyx-tube contracted at the mouth, at length fleshy, 

 with 5 segments. Petals 5. Achenia numerous, bony, hairy, attached 

 to the inside of the fleshy calyx-tube. Leaves pinnate. Shrubs. 



i. R. CAROLINA (Swamp Rose}. Stem smooth, armed with stout- 

 hooked prickles ; leaflets 5-9, oblong, serrate, pale beneath ; petioles some- 

 what prickly ; flowers 3-5, in leafy clusters at the ends of the branches, light 

 red ; calyx and peduncles glandular-hispid. Common in swamps, 4-8 feet 

 high. June-July. 



2. R. LUCIDA (Wild Rose}. Stems armed with scattered prickles; leaf- 

 lets 5-9, elliptical, sharply serrate, smooth and shining above ; flowers 1-3, 

 pale red ; peduncles and appendaged calyx-segments glandular-hispid ; fruit 

 depressed, globose, small, red, hispid. A shrub, in dry fields, 1-4 feet high. 

 June-July. 



3. R. SETIGERA (Prairie Rose}. Branches elongated, glabrous, with a 

 few, stout, somewhat hooked prickles ; leaflets 3-5, large, ovate, smooth and 

 shining above, sharply serrate ; flowers in very large, corymbose clusters, 

 nearly scentless, of a changeable reddish color ; styles united ; fruit globose. 

 A climbing species, 10-20 feet high. June- July. 



4. R. RUBIGINOSA (Sweet Brier}. Stem smooth, armed with stout, re- 

 curved prickles ; leaflets 5-7, roundish-oval, sharply serrate, and with the 

 petioles and stipules clothed with ferruginous glands beneath ; flowers light 

 red, or white, fragant, mostly solitary ; fruit ovate, or obovate, reddish-orange 

 when full grown. Common in fields ; often cultivated. June. 



11. Crataegus. Calyx-tube urceolate, with a 5-cleft limb. Petals 

 5, spreading. Stamens numerous Styles 1-5. Pome fleshy, contain- 

 ing 1-5 long, i-seeded carpels. 



i. C. COCCINEA (White Thorn}. Leaves roundish-ovate, 5-Q-lobed, 

 sharply incised, thin, acutely serrate, on slender petioles ; flowers white, 



