152 R0SACE2E. (ROSE FAMILT.) 



§ 1. GEUM proper. Styles jointed and bent near the middle; the lower portion 

 persistent, naked, hooked at the end after the deflexed and mostly somewhat hairy 

 upper joint falls away: head of fruit sessile in the calyx: calyx-lobts reflexed. 

 (Flowers somewhat panicled at the summit of a leafy stem: achenia in our 

 species glabrous or nearly so below, more or less bristly at the top or along the base 

 of the style.) 

 * Petals white or pale greenish-yellow, small, spatulate or oblong: stipules small. 



1. G. album, Gmelin. Smoothish or softly pubescent ; stem slender (2° high) ; 

 root-leaves of 3 - 5 leaflets, or simple and rounded, with a few minute leaflets on 

 the petiole below ; those of the stem 3-divided or lohed, or only toothed ; petals 

 about the length of the calyx ; receptacle of the fruit densely bristly-hirsute. — Bor- 

 ders of woods, &c. : common. May - Aug. — Too near the European G. urba- 

 num ; probably a white or whitish-flowered form of it. 



2. G. Virginianum, L. Bristly -hairy, especially the stout stem ; lower and 

 root-leaves pinnate, very various, the upper mostly 3-parted or divided, incised ; 

 petals inconspicuous, shorter than the calyx ; receptacle of the fruit glabrous or 

 nearly so. — Borders of woods and low grounds: common. June -Aug. — 

 Heads of fruit larger than in the preceding, on stouter hirsute peduncles. 



* * Petals golden-yellow, conspicuous, broadly obovate, exceeding the calyx: stipules 

 larger and all deeply cut. 



3. G. macrophyllum, Willd. Bristly-hairy, stout (1° -3° high); root- 

 leaves lyrately and interruptedly pinnate, with the terminal leaflet very large and 

 round-heart-shaped ; lateral leaflets of the stem-leaves 2-4, minute, the terminal 

 roundish, 3-cleft, the lobes wedge-form and rounded; receptacle of the fruit nearly 

 naked. — Around the base of the White Mountains, New Hampshire, also North- 

 ern Michigan, Illinois, and northwestward. June. (Eu.) 



4. G. striatum, Ait. Somewhat hairy (3° -5° high); root-leaves inter- 

 ruptedly pinnate, the leaflets wedge-obovate ; leaflets of the stem-leaves 3-5, rhom- 

 bic-ovate or oblong, acute ; receptacle of fruit downy. — Moist meadows : common, 

 especially northward. July, Aug. (Eu.) 



§3. STYLIPUS, Raf. Styles smooth: head of fruit conspicuously stalked in the 

 calyx: bractlets of the calyx none: otherwise nearly as § 1. 



5. G. vdrnum, Torr. & Gr. Somewhat pubescent ; stems ascending, few- 

 leaved, slender ; root-leaves roundish-heart-shaped, 3 - 5-lobed, or some of them 

 pinnate, with the lobes cut ; petals yellow, about the length of the calyx ; recep- 

 tacle smooth. (Stylipus vernus, Raf.) — Thickets, Ohio to Illinois and Ken- 

 tucky. April - June. 



§ 3. CARYOPHYLLATA, Tourn. Style jointed and bent in the middle, the up- 

 per joint plumose: floivers large: calyx erect or spreading: petals erect. 



6. G. rivale, L. (Water, or Purple Atens.) Stems nearly simple, 

 several-flowered (2° high) ; root-leaves lyrate and interruptedly pinnate ; those 

 of the stem few, 3-foliolate or 3-lobed ; petals dilated-obovate, rctuse, contracted 

 into a claw, purplish-orange ; head of fruit stalked in the calyx. — Bogs and wet 

 meadows, New England to Penn., Wisconsin, and northward. May. — Blos- 

 soms nodding, but the feathery fruiting heads upright. Calyx brown-purple. 

 (Eu.) 



