102 ROSACEA. 



opposite the calx segments. Achemum dry, included in 

 the hardened 4-winged calyx-tube. — Perennial (rarely an- 

 nual) herbs, icith unequally pinnate leaves and small flower* 

 in close spiked heads. 



1. S. Canadensis, L. Burnet Saxifiagc. 



Smooth; leaves pinnate; leaflets ovate-oblong, sub-cordate, serrate; spikes eylin- 

 dric, long ; stamens longer than the corolla. 



Wet meadows. Aug., Sept. Stem 2 to 4 feet high, smooth, striate, sparingly 

 branched. Stipuhs leafy, serrate. Flowers white, in crowded spikes, which are 

 from 2 to 5 inches long, terminating the long naked branches. Calyx greenish- 

 white, resembling a corolla. 



9. POTERIUM. Linn. 



Lat. poterium, a drinking vessel. 



Flowers monoecious. Calyx-tube contracted at the 

 mouth, 3-bracteate, limb 4-parted. Petals none. Sta- 

 mens 20 to 30. Ovaries 2; style filiform. Achenia dry, 

 included in the calyx. — Herbs with unequally p>innatc leaves* 



P. SANGUISORBA, L. Burnet. 



Smooth; stem unarmed, angular; leaflets 7 to 11, orate or roundish, deeply ser- 

 rate; spike or heads sub-globose, the lower flowers stamiuate. Per. Occasionally 

 cultivated, and at one time held in high repute for its supposed medicinal pro- 

 p.rties. 



10. GEUM. Linn. Atoms. 



Gr. geuo, to give an agreeable odor; some of the roots Icing aromatic. 



Calyx bell-shaped or concave, deeply 5-cleft, usually with 

 5 small bractlets alternating with the segments. Petals 5. 

 Stamens numerous, inserted with the disk that lines the 

 base of the calyx. Achenia numerous, hooked on a coni- 

 cal or cylindric dry receptacle, the long persistent styles 

 forming hairy or jointed tails. — Perennial herbs, with pin- 

 nate or lyrate leaves. 



1. G. Virginianum, L. White Avem. 



Stem rather hairy below ; radical leaves pinnate, lyrate, or rarely simple and 

 rounded; those of the stem 3 to 5-lobed or divided, all unequally and incisely 

 dentate, softly pubescent; stipules obovate, entire or incised; petals wedg*-obovate 

 scarcely as long as the calyx. 



Woods and meadows ; common. June, July. Stem simple or branched. Leaves 

 very variable in form : lower ones often 3-foliate, with appendaged petioles 6 to 8 

 inches long. Upper leaves simple, acute, sessile. Flowers ratbar small, white or 

 pale yellow on peduncles 1 to 3 inches long terminating the branches, at first 

 somewhat nodding, at length erect. 



2. Gr. rivale, L. Water Avens. Purple Avcns. 

 Pubescent ; stem sub-simple ; radwetf leaves lyrate and interruptedly pfamafce* 





