254 XL VIII. ROSACE^E. GEUM. 



* Styles articulated and geniculate, upper joint deciduous. 



1. G. RIVALE. Water Avens. Purple avens. 



Pubescent ; st. subsimple ; radical Ivs. lyrate ; slip, ovate, acute ; fls. nod- 

 ding; pet. as long as the erect -calyx segments; upper' joint of the persistent style 

 plumose. A fine plant, with drooping, purple flowers, conspicuous among 

 ihe grass in wet meadows, Northern and Mid. States. Rhizoma woody, creep- 

 ing. Stem 1 2f high, paniculate at top. Root leaves interruptedly pinnate, 

 inclining to lyrate, 46' long, terminal leaflet large, roundish, lobed and cre- 

 nate-dentate. Stem leaves 1 3, 3- foliate or lobed, subsessile. Flowers sub- 

 globose. Calyx purplish-brown. Petals broad-obcordate, clawed, purplish- 

 yellow, veined. Jn. The root is aromatic and astringent. 



2. G. STRICTUM. Ait. Yellow Avens. 



Hirsute ; radical Ivs. interruptedly pinnate ; cauline 3 5-foliate ; Ifts. obo- 

 vate and ovate, lobed and toothed ; stip. large and erect ; bracteoles linear, shorter 

 than the sepals ; pet. roundish, longer than the calyx ; sty. smooth, upper joint 

 hairy. Fields moist or dry, N. States and Brit. Am. Stem hispid at base, 2 

 3f high, dichotomous, and with spreading hairs at summit. Root leaves 5 8' 

 long, inclining to lyrate, the terminal leaflet largest, obovate and lobed. Flow- 

 ers numerous, rather large, yellow. Receptacle densely pubescent. Jl. Aug. 



3. G. VIRGINIANUM. (G. album. Gmel.} White Avens. 



Pubescent ; radical Ivs. pinnate, ternate, or even rarely simple ; cauline 

 3 5-foliate or lobed, all unequally and incisely dentate, nearly smooth or softly 

 pubescent ; fls. erect ; pet. not exceeding the calyx ; sty. glabrous ; recep. densely 

 hirsute. Hedges and thickets, Can. and U. S. Stem simple or branched, 

 smoothish above. Leaves very variable in form, lower ones often 3-foliate, 

 with long, (6 8') appendaged petioles. Stipules mostly incised. Upper leaves 

 simple, acute, sessile. Flowers rather small, white. Peduncles in fruit long 

 and diverging. Jl. 



4. G. MACROPHYLLUM. Willd. Large-leaved Yellow Avens. 



Hispid; radical Ivs. interruptedly lyrate-pinnate, the terminal leaflet much 

 the largest, roundish-cordate ; cauline with minute, lateral leaflets, and a large, 

 roundish, lobed, terminal one, all unequally dentate ; pet. longer than the calyx ; 

 recep. nearly smooth. White Mts. ! Stem 1 2f high, stout, very hispid and 

 leafy. Terminal leaflets 3 5' diam. Flowers yellow. Jn. Jl. 



5. G. VERNUM. T. & G. (Stylipus vernus. Raf.} 



Slender and slightly pubescent ; st. ascending at base; radical Ivs. pin- 

 nately 5 9-foliate, with incised leaflets, or often simple and cordate, incisely 

 lobed and dentate ; cauline Ivs. 3 5-foliate or lobed ; stip. large and incised ; 

 fls. very small ; scp. reflexed ; head of carpels globose, raised on a slender stipe. 

 Shades and thickets, Ohio ! to 111. and Tex. Stem 820' high, striate, di- 

 or trichotomous at top, few-leaved and few-flowered. Petals yellow, and with 

 the sepals hardly more than 1" in length. Stipe of the head of carpels f long. 

 Apr. Jn. 



* * Styles not articulated, wholly persistent. SIEVERSIA. R. Br. 



6. G. TRiFLORUM. Pursh. Three-flowered Geum. 



Villous ; st. erect, about 3-flowered ; Ivs. mostly radical, interruptedly pin- 

 nate, of numerous cuneate, incisely dentate leaflets ; bracteoks linear, longer 

 than the sepals ; sty. plumose, very long in fruit. Brit. Am. and the Western 

 States ! rare in the Northern. Stems scarcely a foot high, with a pair of oppo- 

 site, laciniate leaves near the middle, and several bracts at the base of the long, 

 slender petioles. Radical leaves 5 -6' long, the terminal leaflet not enlarged. 

 Flowers rather large, purplish white. Styles 2' long in fruit. May, Jn. 



7. G. PECKII. Pursh. Peck's Geum. 



Nearly glabrous; st. erect, several-flowered, nearly naked; radical Ivs. 

 iyrate-pinnate, the terminal leaflet very large, roundish, truncate at base, the 

 lateral ones minute ; pet. much longer than the calyx. White Mts. ! Scape 9' 

 high (45, Bw. 12 18, T. fy G.), with several small, incised bracts. Petioles 

 3 5' long, bearing 4 or 6, dentate, lateral leaflets 14" long, and ending in a 

 half-round leaflet 24' wide, lobed and dentate. Flowers 8" diam., yellow, ter- 

 minal on the elongated branches. Jl. Aug. 



