ORDER 47. ROSACEJZ. 343 



to a foot or more in length. Fls. yellow, on long pedicels. Cal. scgm. lanceolate 

 or linear. Apr. Aug. 



8. PUMILA T. & G. Very small and delicate, flowering in Apr. and May, 



everywhere ; sts. a few inches long. (P. pumila Ph.) 



y SIMPLEX T. & G. Plant less hirsute -, st. simple, erect or ascending si base; 

 Ifts. oval-cuneiform. Flowering Jn. to Aug. in richer soils. Sts. 8 to 14' 

 high. Lfts. about 1' long, as wide. (P. simplex MX.) 



5 P. argentea L. St. ascending, lomentous, branched above ; Ifts. oblong-cunei- 

 form, with a few, large, incised teeth, smooth abov , silvery canescent beneath^ 

 sessile; Jis. in a cymous corymb ; petals longer than the obtusish sep. A pretty' 

 plant, on dry or rocky hills, Can. and N. States, remarkable for the silvery white- 

 ness of the lower surface of the Ivs. Sts. G to 10', long, at length with slender 

 branches. Lfts. 5 to 9'' by 1 to 2", with 2 or 3 slender, spreading teeth each 

 sido: upper ones linear, entire. Fls. small; cal. canoscant; petals yellow. Jn. 



Sept. 



6 P. recta Willd. Erect, simple, pubescent-; Ifls. 5 to 7, oblong or oblanccolate, 

 coarsely serrate, with largo, cleft stipu.cs-; fls. in ft terminal, expanding cymoj 

 petals obcordate, longer than the ovate, acute sep. Cultivated and sparingly 

 naturalized, N. Eng. to Ohio. St. 1 to 2fhigh. Fls. light yellow. 



7 P. fruticosa L. St. fruticous, very branching, hirsute, erect; Ifts. 5 to 7, lin- 

 ear-oblong, all sessile, margin entire and revolute ; petals large, much longer than 

 the calyx. A low, bushy shrub, N. States (Niagara Falls, Willoughby Lake, Vt. 

 etc.) and Brit. Am. Sts. 1 to 2f high, with a reddish bark. Petioles shorter than 

 the leaves. Leaf about 1' by 2'', acute, crowded, pubescent. Stip. nearly as 

 long as the petioles. Fls. 1' diam., yellow, in terminal clusters. Jn., Aug. (P. 

 floribunda, Ph.) 



8 P. anserina L. SILVER WEED. GOOSE GRASS. St. slender, creeping, pros- 

 trate, rooting; Ivs. interruptedly pinnate, //Vs. many pairs, oblong, deeply serrate, 

 canescent beneath ; ped. solitary, 1-flowered. very long. A fine species, on wet 

 shores and meadows, N. Eng. to Arc. Am. Sts. subterraneous, sending oct 

 reddish stolons 1 to 2f long. Petioles mostly radical, 6 to 10' long. Lfts. 1 to 

 H' by 3 to 6", sessile, with several minute pairs interposed. Ped. r.s long as tbo 

 Ivs. Fls. yellow, 1' diam. Jn. Sept. 



9 P. paradoxa Nutt. Decumbent at base, pubescent; Ivs. pinnate, Ifts. 7 to 0, 

 obovate-oblong, incised, the upper ones confluent; stip. ovate ; ped. solitary, ro- 

 curved in fruit; petals obovate, about equaling the s:-p. ; ach. 2-lobed, the lower 

 portion a thick, starchy sppend-jge. River banks, Ohio to Oreg., Isl. opposite St. 

 Louis. St. 8 to 12' long. Lfts. G' long, scarcelv larger than the entire stipules. 

 Jn., Jl. (P. supina MX.) 



10 P. Pennsylvanica L. Erect, canescently tomentous or soft-villous ; Ifts. 5 

 to 9, oblong, obtuse, pinnatifid or pectinate, upper ones crowded or confluent, 

 larger ; cyme fastigiate, at length expanding ; petals cmarginate, scarcely longer 

 than the acute sepals. X. Einr. (Pursh.); Can. X. Yv'. to Siberia. (P. pcctinato- 

 Fisch.) 



11 P. arguta Ph. Erect, grayish, pubescent and villous' radical Ivs. on lonj 

 petioles, 7 to 9-foliate, cauline few, 3 to 7-foliate, Ifts. broadly ovate, cut-serrate, 

 crowded ; fls. in dense terminal cymes. Along streams, cto., Can. and N. States, 

 W. to the Rocky Mts. St. 2 to 3f high, stout, terete, striate, and with nearly 

 the whole plant very hairy. Radical ivs. one foot or more long Ifts. 1 to 2' by 

 8 to 16'', sessile, odd one petiolulate. Fls. about 8" diam. ; j.er. roundish, yel- 

 lowish white, longer than the sepals; disk glandular, 5-lobcc! ; *inth. blackish, 

 with a white border. May, Jn. (P. confertiflora Hitchcock, l^oottia sylves- 

 tris Bw.) 



25. SIBBAL'DIA procumbens, L. " Mountains cf Can. ar.d Vt." 

 (Pursli) ; but not since found within our limits. 



26. SPIR>E X A, L. (Gr. er-e/pa, a cord or wreath ; the Hover* are 

 or may be used in garlands.) Calyx 5-cleft, persistent ; petals 5, round- 

 ish ; stamens 10 to 50, exsertcd ; carpels distinct, 3 to 12, follicdar, 



