440 ROSACEA. POTENTILLA. 



* * * Perennial : leaves pulmately 3-1-foliolate, 



t Flowering stems erect or ascending, not sarnientose. 



_/=> 12. P. gracilis (Doucl.) : stem erert, tall, villous-piibescent ; leaves 

 ' palmately 5-7-foliolate, the radical ones on long petioles; the cauline 1-2, 

 often subsessile; leaflets oblanceolate, deejily pinnatifid-serrate with trian^ju- 

 lar-lanceolate spreading teeth, canescently tomentose beneath ; stipules 

 large, ovate-lanceolate, acuminate, entire ; cyme fastigiate, loose, the 

 primary branches elongated ; petals obcoi'date, much longer than the ovate- 

 lanceolate very acute or acumiuate segments of the calyx ; bracteolar 

 segments linear, shorter. — Hook..' hot. mag. I. 2984, S^' JL Bar.- Am. 1. 

 p. 192. 



/?. flahelliformis (Nutt. ! mss.) : leaves 5-9-foliolate ; leaflets much 

 crowded, deeply pinnatifid ; the lobes linear-lanceolate. — P. flabellifonnis, 

 Lehm. ! stirj). 2nig. 2. ^^. 12, 4* in Hook. I. c. t. 66, c^ suppl. Pot. p. 

 13, i.Q. 



Oregon! common. /?. Plains of the Saskatchawan, ii?"c7?rt)'c?.so?? .' Drum- 

 mond ! Plains of the Oregon (with a.), NtitfnU ! — The inflorescence of P. 

 flahelliformis is at length expanded, and the primary branches elongated, as 

 in P. gracilis. The difference between the extreme forms of the two is 

 striking, but numerous intermediate states were found by Mr. Nuttall. The 

 stem is tall and slender, about 2 feet high, and mostly unbranched, except 

 at the summit. 



13. P. fastigiata (Nutt. ! mss.) : " canescently silky-tomento?e ; stem 

 erect, leafy ; leaves palmately 5-7-foliolate ; leaflets cuneate-oblong, in- 

 cisely or pinnatifid-serrate ; stipules mostly entire : flowers crowded, fasti- 

 giate ; segments of the calyx lanceolate, the outer ones much smaller ; 

 petals obovate, a little longer than the calyx ; achenia smooth. 



/?. " larger, more densely clothed with soft silky hairs. 

 " Plains of the Rocky Mountains. — Plant 7-8 inches high. Flowers 

 much smaller than in P. rigida." Nuttall. 



14. P. rigida (Nutt.) : hirsute with short appressed hairs, and minutely 

 glandular, not canescent ; stem erect, stout, leafy ; leaves palmately 5-7- 

 foliolate ; leaflets cuneiform-oblong ; deeply pinnatifid-toothed ; the teeth 

 lanceolate-linear, approximate ; stipules short, mostly entire ; flowers 

 rather crowded ; petals broadly obcordate, much longer than the ovate- 

 lanceolate calyx-segments ; achenia smooth, slightly margined. — Nutt. ! in 

 jour. acad. Philad. 7. p. 20. P. recta ? Nutt. gen. 1. j}- 310. P. chrj's- 



antha, Lehm. in Hook. I. c. 1 



On the Missouri, from Fort Mandan to the Rocky Mountains, Nuttall ! 

 {Drummond /) — Resembles P. recta, but apparently distinct from that 

 variable species. Dr. Short has sent us specimens of P. recta, which occurs 

 ' as a weed in his garden, but we do not learn that it is anywhere naturalized 

 in the United States. We find the achenia perfecth- smooth in all our 

 European specimens of that species, except when fully mature. 



15. P. Salishurgensis (Hjenke) : caudex prostrate, somewhat rooting ; 

 stems decumbent at the base, pubescent ; radical leaves palmately 5-folio- 

 late ; leaflets obovate, glabrous, the margin and veins beneath pubescent 

 with spreading hairs, incisely serrate towards the apex with about 3 spread- 

 ing teeth on each side of the same length with the tenninal one ; stipules all 

 ovate [petals obcordate, safl"ron-color, twice the length of the calyx] ; 

 achenia obsoletely rugose. Koch. — Hanke, in Jacq. coll. 2. p. 68, "4* '^• 

 rar. 3. t. 490 ; Koch. syn. p. 216. P. maculata, Pourret ; E. Meyer, pi. 



