rosacea, (rose family.) 153 



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

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

 and bearing only bracts or small leaves. ) 



7. G. trifldrum, 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.) 



Yar. 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. (Comarofsis, 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. proeumbens, 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 lak 

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



