HOSACE^. (rose familt.) 153 



§4. SIEVERSIA, Willd. Slt/h not jointed, wholly persistent and straight! head 

 offrmt sessile : flowers large : ealyx erect or spreading. (Flowering stems simple, 

 and bearing only bracts or small leaoes,) 



7. G. t!rifl.6rum, 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 infruiL — Kocks, N, New Hampshire and N. New York to Wisconsin 

 and westward : rare. April - June. 



8. G. radi^tum, 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. P6okii. Nearly glabrous, or the stalks and veins of the leaves sparsely 

 hirsute. (G. Peckii, Pura^.) -^Alpine tops of the White Mountains of New 

 Hampshire. July - Sept. 



9. WALDSTEINIA, Willd. (Comak6psis, CC.) 



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. fragarioldes, Tratt. (Barren Stkawberey. ) Low; leaflets 

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

 the ealyx. (Dalibarda fragarioldes, Michx. ) — Wooded hiDsides, common north- 

 ward, and southward along the Alleghauies. June. 



10. SIBBAIiDIA, L. Sibbaldia. 



Calyx flattish, 5-eleft, 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 perenpials, — in fact only reduced Potentillas. (Dedicated 

 to Dr. Robert SibbcUd, 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-poil. Eive-fingek. 



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

 ing 10-oleft. 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 



