' ROSACES. (ROSE FAMILY.) 153 



4. SIEVERSIA, Willd. Style not jointed, wkdly persistent and straight : head 

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

 and bearing only bracts or small leaves.) 



7. G. triflbrum, 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, N. New Hampshire and N. New York to Wisconsin 

 and westward : rare. April -June. 



8. G. radiatum, 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. P6ckii. 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. 



9. WALDSTEINIA, 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. fragarioides, Tratt. (BARREN STRAWBERRY.) Low; leaflets 

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

 the calyx. (Dalibarda fragarioides, Michx.) Wooded hillsides, common north- 

 ward, and southward along the Alleghanies. June. 



10. SIBBALDIA, L. SIBBALDIA. 



Calyx flattish, 5-cleft, with 5 bractlets. Petals 5, linear-oblong, minute. Sta- 

 mens 5, inserted alternate with the petals into the margin of the woolly disk 

 which lines the base of the calyx. Achenia 5-10: styles lateral. Low and 

 depressed mountain perennials, in fact only reduced Potentillas. (Dedicated 

 to Dr. Robert Sibbald, Prof, at Edinburgh at the close of the 17th century.) 



1. S. prociimbens, L. Leaflets 3, wedge-shaped, 3-toothed at the apex; 

 petals yellow. Alpine summits of the White Mountains of New Hampshire, 

 and northward. (Eu.) 



11. POTENTILLA, L. CINQUE-FOIL. FIVE-FINGER. 



Calyx flat, deeply 5-cleft, with as many bractlets at the sinuses, thus appear- 

 ing 10-cleft. Petals 5, usually roundish. Stamens many. Achenia many, 

 collected in a head on the dry mostly pubescent or hairy receptacle : styles lat- 

 eral or terminal, deciduous. Radicle superior. Herbs, or rarely shrubs, with 



