162 ROSACES. (ROSE FAMILY.) 



1. P. Canad6nse, Benth. & Hook. (CANADIAN BURNET.) Stamens 4, 

 long-exserted, club-shaped, white, as is the whole of the elongated and cylin- 

 drical spike ; stem 3-6 high ; leaflets numerous, ovate or oblong-lanceolate, 

 coarsely serrate, obtuse, heart-shaped at base, as if stipellate ; stipules serrate. 

 Bogs and wet meadows, Newf. to mountains of Ga., west to Mich. 



P. SANGUISORBA, L. (GARDEN BURNET.) Stamens 12 or more in the 

 lower flowers of the globular greenish head, with drooping capillary filaments, 

 the upper flowers pistillate only; stems about 1 high; leaflets" numerous, 

 small, ovate, deeply cut. Fields and rocks, N. Y. to Md. (Adv. from Eu.) 



15. ROSA, Tourn. ROSE. 



Calyx-tube urn-shaped, contracted at the mouth, becoming fleshy in fruit. 

 Petals 5, obovate or obcordate, inserted with the many stamens into the edge 

 of the hollow thin disk that lines the calyx-tube and within bears the numerous 

 pistils below. Ovaries hairy, becoming bony achenes in fruit. Shrubby and 

 usually spiny or prickly, with odd-pinnate leaves, and stipules cohering with 

 the petiole ; stalks, foliage, etc., often bearing aromatic glands. Many of the 

 species are very variable in their characters, and are often indeterminable 

 upon imperfect specimens. (The ancient Latin name.) 



* Styles cohering in a protruding column, as long as the stamens. 



1. R. setigera, Michx. (CLIMBING or PRAIRIE ROSE.) Stems climbing, 

 armed with stout nearly straight scattered prickles, not bristly ; leaflets 3-5, 

 ovate, acute, sharply serrate, smooth or downy beneath; stalks and calyx 

 glandular ; flowers corymbed ; sepals pointed ; petals deep rose-color changing 

 to white; fruit (hip) globular. Borders of prairies and thickets, Ont. t<J 

 Ohio, S. C., and Fla., west to Wise., Neb., and Tex. ; also cultivated. July. 

 The only American climbing rose, or with united protruding styles ; strong 

 shoots growing 10-20 in a season. 



* * Styles distinct; sepals connivent after flowering and persistent; pedicels 



and receptacles naked. 

 - Fruit oblong-obovate to oblong ; infrastipular spines usually none. 



2. R. Engelmanni, Watson. Stems usually 3 - 4 high or less ; iufra- 

 stipular spines, when present, straight and slender ; prickles often abundant ; 

 leaflets 5 -7, often somewhat resinous-puberulent beneath and the teeth serru- 

 late; flowers solitary; sepals entire, naked or hispid; fruit 6-12" long. 

 Whisky Island, L. Huron, shores of L. Superior, and west to the Red River 

 valley, and in the mountains from N. Mont, and N. Idaho to Col. 



4_ H_ Fruit globose ; infrastipular spines none ; acicular prickles often present. 



3. R. blanda, Ait. Stems 1 -3 high, icholly unarmed (occasionally with 

 a few or very rarely numerous prickles) ; stipules dilated, naked and entire, or 

 slightly glandular-toothed; leaflets 5-7, usually oblong-lanceolate, cuneate at 

 base and petiolulate, simply serrate, not resinous ; flowers usually large, corym- 

 bose or solitary ; sepals hispid, entire. On rocks and rocky shores, Newf. to 

 N. Eng., central N. Y., 111. (La Salle Co.), and the region of the Great Lakes. 



4. R. Sayi, Schwein. Stems usually low (1-2 high), very prickly; 

 stipules usually dilated, glandular-ciliate and resinous ; leaflets 3-7, broadly 

 elliptical to oblong-lanceolate, sessile and obtuse or subcordate at base, resinous- 



