94 ROSACE^E. 



White Hills, N. H. N. to Labrador. July, 2L Flower white, on a termi- 

 nal peduncle. Scarcely distinct from D. octopetala Linn. 



Entire-leaved Dryas. 



4. GEUM. Linn. Avens. 



(From the Greek ysvo), to yield an agreeable flavor ; the root of one species 

 being aromatic.) 



Calyx concave; limb 5-cleft, with 5 small external bracts 

 alternating with the segments. Petals 5. Stamens numerous, 

 inserted into the disk that lines the base of the calyx. Carpels 

 in a head, awned by the persistent styles. 



1. G. strictum Ait. : hairy; radical and lower leaves interruptedly pm- 

 nate ; upper cauline ones 3 5- foliate; the leafets rhombic-ovate, acute, 

 sharply toothed and incised ; stipules large, incised ; petals roundish, longer 

 than the calyx. C. Canadense Murr. 



Swamps. Can. N. Y. and New Eng. Aug. Q|. Stem 24 feet high, 

 simple. Radical and lower leaves on long petioles, the upper nearly sessile. 

 Flowers large, yellow, in a loose dichotomous panicle. Yellow Avens. 



2. G. Virginianum Linn. : pubescent ; radical leaves pseudo-pinnate or 

 ternate ; upper simple, lanceolate, incisely serrate ; stipules subovate, entire 

 or incised ; petals cuneate-obovate, shorter than the calyx. G. album 



wind. 



Woods. Can. to Geor. W. to Miss. June, July. %. Stem 23 feet high, 

 smooth, or pubescent. Radical leaves on long petioles. Flowers white or pale 

 yellow, on peduncles 1 3 inches long terminating the branches, at first some- 

 what nodding, at length erect. Virginian Avens. 



3. G. macrophyllum Willd. : hispid ; radical leaves lyrately and inter- 

 ruptedly pinnate ; cauline with 2 4 minute lateral leafets, the terminal one 

 large roundish and 3-parted ; stipules nearly entire ; petals obovate, a little 

 longer than the calyx. 



White Mountains. N. H. N. to Arct. Amer. W. to the Pacific. June, 

 July. '2J-. Stem 1 2 feet high, very hispid. Leaves sometimes nearly smooth. 

 Flowers yellow, intermediate in size between G. strictum and Virginianum. 



Long-leaved Avens. 



4. G. rivale Linn. : pubescent ; stem simple, 1 4 flowered ; radical 

 leaves interruptedly pinnate ; cauline ternate or 3-lobed ; petals broad ob- 

 cordate-spatulate, emarginate, about as long as the calyx ; carpels in a 

 stipedhead, very hairy; upper joint of the style plumose. 



Moist places. Can. to Penn. W. to the Rocky Mountains. May, June. Tj.. 

 Stem 18 inches or 2 feet high, nearly simple, somewhat pilose. Radical leaves 

 on very long petioles. Flowers largej purple, nodding. Water Avens. 



5. G. triflorum Pursh. : stem nearly naked, softly pubescent, about 

 3-flowered at the summit ; radical leaves interruptedly pinnate, the petioles 

 hairy ; leafets cuneiform-oblong, deeply incised and toothed ; bracts longer 

 than the segments of the calyx ; styles very long and filiform in fruit, 

 plumose. Sieversia triflora, R. Drown. 



On rocks. Watertown, Jefferson county, N. Y. ; very rare. Dr. Crawe. 

 White Mountains, N. H. W. to the Rocky Mountains. N. to Labrador. May, 

 June. %. -Stem 46 inches, in fruit 1215 inches high, with two opposite 



