ROSACKiE. (rose FAMILY.) 153 



§4. SIEVf:RSrA, AYill.l. Sli/le not jointed, w/wlh/ prrsistrnt and sirnn/lif .- head 

 of fruit S'SsUf : floinrs Itiiyf : ctili/x erect or spreudini/. { Floiverinij stems simple, 

 and Iwarini; onli/ /tracts or small l(nves.) 



7. G. trifl6rum, Pursh. Low, softly-hairy; root-leaves interruptedly 

 pinnate; tlie leatk-ts very numerous and erowded, ol)lon;;-wedjje-('orm, deeply 

 eut-tootlicd ; liowers 3 or more on lon<ij peduncles; bractlcts linear, lo"f/er than tlte 

 purple cali/r, as lonrj as the oblong purplish erect petals: sfi/les v<ry lomj (2'), strongly 

 plumose in fruiL — Roeks, N. New Hampshire and N. New York to Wisconsin 

 and westward : rare. April -June. 



8. G. radi^tum, Michx. Hirsutely liairy or smoothisli ; root-leavrs roundcd- 

 kidney-siuiped, radiate-veined (2' -5' broad), doul)ly or irregularly cut-toothed and 

 obscurely 5- 7-lol)ed, also a set of minute leaflets down the long petiole ; stems 

 (8' -18' high) 1 - .5-flowered ; hrarllets minute; petals ije.llow, ronnd-obovate and 

 more or less obeordatc, exceeding the calyx (h' long), spreading ; styles naked 

 except the base. (High mountains of Carolina.) 



Var. P6ckii. Nearly glabrous, or the stalks and veins of the leaves sparsely 

 liirsutc. (G. Peckii, Pursh.) — 'Alpine tops of the White Mountains of New 

 Hampshire. July -Sept. 



9. WALDSTEINIA, Willd. (CoMviiorsi^ 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 

 biise 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 Framis ran Watdstein, a German botanist.) 



1. W. fragarioides, Tratt. (B.\rren STR.\.wnERKT.) 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. Siubaldia. 



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

 mens .'), inserted alternate with the petals into the margin of the woolly disk 

 which lines the base of the calyx. Achenia .'3 -10: styles lateral. — Low and 

 depre.ssed mountain perennials, — in fact only reduced Potentillas. (Dedicated 

 to Dr. Ruliert Sihhild, Prof, at Edinburgh at the close of the 17th century.) 



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

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

 and northward. (Ku.) 



11. POTENTtLLA, L. Cinqce-foil. Five-finger. 



Calyx flat, deeply .')-(l(fr, with as many bractlets at the sinuses, thus appear- 

 ing 10-clcft. Petals 5, usually roundish. Stamens many. Achenin many, 

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

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



