84 ROSACEiE. (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: leaflets pinnately 5 ?oll,obovate or oblong: cymes 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- 



fid : 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, Puish. Smaller : leaflets 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. 

 ++ Leaves pinnate (sometimes digitate in Xos. 7 and 11) : bractlets shorter than the 



sepals. 



7. P. Hippiana, Lehm. Densely ivhite-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. effusa, Dougl. Tomentose throughout ivith 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. crillita, Gray. Appressed silky-vilious, not at all tomentose: stems 

 decumbent: leaflets 9 to 15, mostly folded and falcately recurved, coarsely ser- 

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

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



