ROSACES. (ROSE FAMILY.) 87 



20. AGRIMONIA, Tourn. AGRIMONY. 



Tall perennial herbs : leaves interruptedly pinnate : flowers in slender spi- 

 cate racemes, with 3-cleft bracts : fruit pendulous. 



1. A. Eupatoria, L. Leaflets 5 to 7, with minute ones intermixed, 

 oblong-obovate, coarsely toothed : petals twice the length of the calyx. 

 Colorado; common throughout the Eastern States. 



21. POTERIUM, L. BURNET. 



Stamens 2 to 4 or more : filaments often elongated. Ours is an annual: 

 leaflets deeply pinnatifid, petiolulate : flowers small, perfect in ours. 



1. P. annuum, Nutt. Glabrous, slender, 6 to 15 inches high: leaflets 

 4 to 6 pairs, ovate to oblong, with linear segments : flowers greenish, the 

 heads ovoid or oblong : fruit shorter than the bracts. From the Upper 

 Missouri southward into the Indian Territory ; also in California and Wash- 

 ington Territory. 



22. ROSA, Tourn. ROSE. 



Calyx without bractlets. Stamens on the thick margin of the silky disk, 

 which nearly closes the mouth of the calyx. Ovaries several, hairy. 

 Usually prickly : leaves with mostly serrate leaflets : flowers corymbose or 

 solitary, showy. Watson, Proc. Am. Acad. xx. 324. 



# Sepals connivent and persistent after flowering. 

 *- No infrastipular spines ; acicular prickles often present : fruit globose. 



1. R. blanda, Ait. Stems 1 to 3 feet high, with usually few prickles or 

 none : stipules dilated, naked and entire, or slightly glandular-toothed ; leaflets 

 5 or 7 (rarely 9), cuneate at base and shortly petiolulate, simply and coarsely 

 toothed, glabrous above, paler and glabrous or more or less pubescent beneath, 

 not resinous : flowers corymbose or solitary : sepals entire, hispid. R. fraxini- 



folia, Gmelin. Within our range at its northeastern boundary, and extending 

 from thence to Newfoundland. 



2. R Sayi, Schwein. Stems 1 or 2 feet high, thickly covered with prickles : 

 stipules dilated, glaudular-ciliate and resinous ; leaflets 3 to 7, usually sessile 

 and obtuse or subcordate at base, more or less doubly toothed, glabrous or slightly 

 pubescent above, resinous beneath: flowers solitary (rarely 2 or 3) : outer sepals 

 with lateral lobes, not hispid Abundant in the mountains from Colorado to 

 British America, thence eastward to Lake Superior. 



3. R. Arkansana, Porter. Stems to 6 feet high, more or less densely 

 prickly : stipules narrow, more or less glandular-toothed ; leaflets 7 to 11, nearli/ 

 sessile or often petiolulate, somewhat cuneate at base, simply and coarsely toothed, 

 glabrous or more or less pubescent beneath, usually not resinous: flowers corym- 

 bose: outer sepals with one or more lateral lobes, usually not hispid. Fl. Colo- 

 rado, 38. R. b'anda, var. setigera, Crepin. Abundant in the mountains from 

 New Mexico and W. Texas to British America, and eastward to the Upper 

 Mississippi. 



