ROSACEA. 63 



-2. P. palustiis, Scop. Fl. Cam. ed. 2. i. 359 (1772j : Linn. Sp. PI. i. 

 502 (1753), under Comarum ; Crantz, Stirp. Austr. 73 (1769), under 

 Fragaria. A stout, subaquatic perennial, "witli creeping stems and large 

 leaves pinnately 5 — 7-foliolate : leaflets obovate-oblong, 2 in. long or 

 more, coarsely and .sharply serrate : fl. 1 in, broad, the inside of the 

 calyx dark purple like the petals ; these miich shorter than the calyx- 

 lobes : the juicy strawberry-like receptacle oval, ^2 ™- thick. — A common 

 plant of northern and subarctic swamps, both in Europe and America. 

 Sierra Co., Lemmon, and Butte, Mrs. Biduell. 



-)—-)—-)— Shrubby ; petals broad, rounded, yellow ; acheves villous, — Genus 

 Dasiphoka, Eaf. ; Pickopogon, Bunge. 



3. P. frnticosa, Linn. Sp. PI. i. 495 (1753). Dasiplwra Jlonbunda, 

 Eaf. Aut. Bot. 167 (1838). Much branched, 1~A ft. high, more or less 

 villous : stipules scarious ; leaflets 5— 7, oblong-lanceolate, entire, approxi- 

 mate, y — 1 in. long : fl. solitary or cymose : petals exceeding the calyx, 

 M — % ill- long : stamens 30 : achenes 20, verj' villous. — Higher Sierra, 

 and far northward around the northern hemisphere. 



-)— -1— -t- -)— Herbs of various habit ; petals rounded ; receptacle small, dry. — 



PoTENTiLiiA proper. 



++ Perennial ; Jiowers ajillary, solitary. 



4. P. Anseriiia, Linn. 1. c. Leaves odd-pinnate, often 1 ft. long ; 

 leaflets 7 — 21, with smaller ones interposed, oblong, sharply serrate, 

 white-tomentose beneath, silky or glabrate above : stems prostrate, with 

 long internodes, rooting at each joint and producing at each a tuft of 

 leaves and one or more long peduncled large yellow flowers : petals 

 34^ — ig in. long, exceeding the calyx : stamens 20 — 25: achenes 20 — 40 : 

 receptacle villous. — Along stream-banks, margins of ponds, or in springy 

 places both along the seaboard and in the mountains. 



-M- -M- Peiennials ; Jiovers terminal, cymose. 

 = Leaves ternate. 



5. P. gelida, C. A. Meyer, Ind. PL Cauc. 167 (1831). Leaves mostly 

 radical ; leaflets broadly cuneiform, i<i — ^^ in. long, rounded at apex and 

 coarsely toothed, the terminal one short petiolulate, the lateral sessile : 

 fl. few : bractlets and calyx-lobes nearly equal : petals 2 — 3 lines broad, 

 exceeding the calyx : achenes oo . — High Sierra, from the Donner Lake 

 district, Bulander, Sonne, northward. July, Aug. 



6. P. Grayi, Wats. Proc. Am. Acad. viii. 560 (1873) : P. Clarkeana, 

 Kell. Proc. Calif. Acad. vii. 94 (1877). Small and slender, deep green, 

 scantily pubescent ; leaflets obovate, % i^- long, toothed at the rounded 

 or truncate apex, the terminal one long-petiolulate : bractlets half as 

 long as the calyx-lobes : petals exceeding the calyx : achenes 15 — 20. — 

 Yosemite and southward, in the higher mountains. June, July. 



= = Leaves palmate or pinnate ; leaflets 5 or more. 



