ROSACE.S:. (ROSE FAMILY.) 117 



$ 2. STYLIPUS, Raf. Styles smooth : head of fruit conspicuously sialked in the 

 calyx : bracllets of the calyx none : otherwise as 1 . 



5. O. vernuill, 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 ; 

 receptacle smooth. Thickets, Ohio to Illinois and Kentucky. April -June. 



3. CARYOPHYLLATA, Toura. Style jointed and bent in the middle, the 

 upper joint plumose : flowers large. : calyx erect or spreading : petals erect. 



6. O. rivale, L. (WATER or PURPLE AVENS.) 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 retuse, contracted 

 into a claw, purplish-orange ; head of fruit stalked. Bogs and wet meadows, 

 N. England to Wisconsin and northward. May. Blossoms nodding, but the 

 feathery fruiting heads upright. Calyx brown-purple. (Eu.) 



$4- SIEVERSIA, Willd. Style not jointed, wholly persistent and straight: head 

 of fruit sessile : Jlowers large : calyx erect or spreading. (Flowering stems simple, 

 and bearing only bracts or small leaves.) 



7. O. trifloruin, Pursh. Low, softly hairy; root-leaves interruptedly 

 pinnate ; the leaflets very numerous and crowded, oblong-wedge-form, deeply 

 cut-toothed ; flowers 3 or more on long peduncles ; bractlets linear, longer than the 

 purple calyx, as long as the oblong purplish erect petals; styles very long (2'), strongly 

 plumose in fruit. Rocks, New Hampshire and N. New York northward to 

 Wisconsin ; rare. April - June. 



8. O. rsuliiif inn, Michx. Hirsutely hairy or smoothish ; root-leaves 

 rounded-kidney-shaped, radiate-veined (2' -5' broad), doubly or irregularly cut- 

 toothed and obscurely 5 - 7-lobed, also a set of minute leaflets down the long 

 petiole ; stems (8' - 18' high) 1 - 5-flowered ; bractlets minute ; petals yellow, round- 

 obovate and more or less obcordate, exceeding the calyx (' long), spreading ; 

 styles naked except the base. (High mountains of Carolina.) 



Var. Pecliii. Nearly glabrous, or the stalks and veins of the leaves 

 sparsely hirsute. (G. Peckii, Pursh.) Alpine tops of the White Mountains of 

 New Hampshire. July - Sept. 



1O. WAIrfDSTEINIA, Willd. (COMAROPSIS, DC.) 



Calyx-tube inversely conical ; the limb 5-cleft, with 5 often minute and decid- 

 uous bractlets. Petals 5. Stamens many, inserted into the throat of the calyx. 

 Achenia 2-6, minutely hairy ; the terminal slender styles deciduous from the 

 base by a joint. Seed erect. Low perennial herbs, with chiefly radical 3-5- 

 lobed or divided leaves, and small yellow flowers on bracted scapes. (Named 

 in honor of Francis von Waldstein, a German botanist.) 



1. W. fragarioidcs, Tratt. (BARREN STRAWBERRY.) Low; leaf- 

 lets 3, broadly wedge-form, cut-toothed ; scapes several-flowered ; petals longer 

 than the calyx. (Dalibarda fragarioides, HfirJtr.) Wooded hill-sides, common 

 northward, and southward along the Alleghanics. 



