84 KOSACE^E. (ROSE FAMILY.) 



smooth : receptacle short. Torr. & Gray, Fl. i. 437. From the Missouri River 

 to the Rocky Mountains. 



Var. millegrana, Watson. Leaves all ternate : stems erect or weak and 

 ascending: akenes often small and light-colored. Rev. Pot. 553. P. mille- 

 grana, Engelm. Eastern slope of the Sierras and eastward to New Mexico 

 and the Missouri. 



5. P. supina, L. Stems decumbent at base or erect : pubescence scanty, 

 villous, spreading: leajiets pinnate! if 5 to 11, obovate or oblong: ci/mes loose, 

 leafy : petals equalling the sepals : stamens 20 : akenes strongly gibbous by the 

 thickening of the very short pedicel. P. paradoxa, Nutt. From the Missouri 

 to New Mexico, and eastward to the Mississippi, Ohio, and the Great Lakes. 

 *+ + Herbaceous perennials, more or less white-tomentose : leaflets incisely-pinnati- 



Jid: bractlets and sepals nearly equal: stamens usually 25. 



6. P. Pennsylvanica, L. Silky-tomentose : leaflets 5 to 9, white- tomen- 

 tose beneath, short-pubescent and greener above, the segments linear, slightly or not 

 at all revolute: cyme fastigiate but rather open, the pedicels erect. From 

 Colorado and New Mexico northward, thence eastward to the New England 

 coast and Canada. 



Var. strigosa, Pursh. Smaller : leajiets mostly tomentose on both surfaces, 

 deeply pectinate-divided or pinnatifid, with revolute margins: cyme short and 

 close. From Colorado northward, and along the Missouri. 



Var. glabrata, Watson. Leaves subglabrous on both sides, the lobes of the 

 leaflets silky-tufted at the apex. Rev. Pot. 554. Mountains of Colorado, 

 Nevada, and northward into British America. 



* # Styles filiform, not glandular at base: inflorescence cymose. 



- Style terminal: carpels glabrous: disk not thickened: stamens 20: herbaceous 



perennials, with conspicuous flowers. 



w- Leaves pinnate (sometimes digitate in Nos. 7 and 11) : bractlets shorter than the 



sepals. 



7. P. Hippiana, Lehm. Densely white-tomentose and silky throughout, the 

 upper surface of the leaves a little darker: stems branching above into a diffuse 

 cyme : leaves occasionally digitate in reduced alpine specimens ; leaflets 5 to 

 11, diminishing uniformly down the petiole, incisely toothed at least towards the 

 apex: carpels 10 to 30. From New Mexico and Arizona to Nebraska and 

 the Saskatchewan. 



Var. pulcherrima, Watson. Leaflets 5 to 9, approximate, crowded, or 

 digitate, the upper surface green and pubescent or subglabrous. Rev. Pot. 555. 

 P. pulcherrima, Lehm. In the mountains from New Mexico to British 

 America. 



8. P. eflfusa, Dougl. Tomentose throughout with scattered villous hairs: 

 stems diffusely branched above: leaflets 5 to 11, interruptedly pinnate, the alternate 

 ones often smaller, coarsely incised-serrate or dentate : carpels 10. From Colo- 

 rado northward into British America. 



9. P. crinita, Gray. Appressed silky-villous, not at all tomentose: stems 

 decumbent: leaflets 9 to 15, mostly folded and f alcatel y recurved, coarsely ser- 

 rate, villous beneath, scarcely so or glabrous above : carpels 25 to 30. PI. 

 Fendl. 41. S. W. Colorado and New Mexico. 



