4S 4 KOSACEAE (ROSE FAMILY) 



3. Styles filiform, lateral; peduncles axillary, solitary, \-fowered; achenes 

 glabrous; receptacle very villous ; herbaceous perennials, with yellow petals. 



17. P. Anserina L. (SILVER WEED.) Spread/in/ by xlcmJcr many-jointed 

 runners, white-tonic ntose and silky-mllous ; leaves all radical, pinnate ; leaflets 

 7-21, with smaller ones interposed, oblong, sharply serrate, silky-tornentose at 

 least beneath ; bractlets and stipules oi'ten incisely cleft ; peduncles elongated. 

 {Argentina Uydb.) Brackish marshes, river-banks, etc., Arctic Am., s. to. 

 N. J., Great L. region, la., N. Dak., N. Mex., and Cal. June-Aug. (Eurasia.) 

 P. Egedii Worrnsk., at least as to forms in our range, appears to be a dwarf 

 state common on exposed rocks. Var. grandis T. & G., is merely a luxuriant 

 state in rich meadows. 



Var. c6ncolor Ser. Leaflets silky-canescent above as well as beneath. 

 Common in the Rocky Mts., and in less pronounced form from n. X. V. to n. Me. 

 and e. Que. 



^lS. P. ptimila Poir. Stems very slender, soon prostrate and repent, appressed- 

 , vittous, flowering from the node above the first well-developed internode ; leaves 

 v '" 3-foliolate but apparently b-foliolate by the parting of the lateral leaflets ; leaflets 

 cuneate-obovate, incisely dentate, obscurely appressed-villous above, silky- 

 canescent beneath. Dry soil, common, coast of Me. to Md. Apr.-early June. 

 A loosely spreading-villous doubtfully distinct plant from Mo. and southeastw. 

 may well be P. CAROLINIANA Poir. 



19. P. canadSnsis L. Snberect (2-7 dm. high) or procumbent, at length 

 often rooting at the tip ; stem fipreading-Mrsute, flowering from the node ab<,re 

 the second well-developed intcniotle ; leaves divided as in the preceding ; leaflets 

 commonly more oblong, serrate rather than dentate, obscurely villous or entirely 

 glabrate above, canescent-silky to green and merely appressed-villous on the 

 veins beneath. Dry sandy soil, s. Me. to Vt., along the Great Lakes to Minn., 

 Kan., and south w. May-July. 



Var. simplex (Michx.) T. & G. Stem covered with shorter ^/i/'/v.wJ n,- snf>- 

 appressed hairs or glabrate; leaflets (apt to be oblanceolate) rather shortly 

 appressed-villous on the veins beneath. (P. simplex Michx.)-*- Chiefly in dry 

 sandy soil, very common ; N. S., southw. and westw. 



20. P. REPTANS L. Stems almost filiform, sparingly pubescent or glabrate, 

 /irotftrate and usually refwut ; leaves much as in P. piimila ; the h-nflftn nivm 

 on both faces, si)ariugly striiiose-pubescent or glabrate, Cuneate-oblanceotate, 

 ere H ute-dentate nearly or quite to the Imsf ; .s7//^/r.s- usually small and un-on- 

 spicuous ; bractlets ovate-lanceolate, about equaling the calyx-lobes; petals 

 broadly obcordate, half longer than the calyx-lobes. ~ Grass-land and waste 

 places, local, Mass, to X. .J. and (). June. (Adv. from Ku.) 



21. P. PROctf MBKNS Sibth. Similar, strigose-pubescent ; h v/tfr/N ."> (rarely 5), 

 riiiieate-obovate, coarsely incix><i <///>//// above the middle ; xti/iHtc* <-</./>ininitx ; 

 bractlets linear-lanceolate. (P. nemoralis Nestler.) Grassy and waste places, 

 Cape Breton I., N. S. (Nat. from Eu.) 



16. FILIPENDULA [Touru.] Hill. 



Flowers perfect or polygamous. Calyx (4-)6-parted. Petals (4-)5, short - 

 clawed. Stamens 20 or more, almost hypogynons, the disk obscure. Carpels 

 o-l."), free. 2-ovuled, mostly 1-seeded, indehiscent, compressed, sometimes 

 twisted. Perennial herbs, with pinnate leaves and panicle. 1 cymose flowers. 

 Stipules kidney-shaped, <. Name 1'i-om fil inn. a tin-cad, and /'ii(hif n*, hanging, 

 in allusion, it is said, to tip- r^ 



1. F. rubra (Hill) Kobinson. (Qi I:I;N OF THE I'KMKII.. Glabrous, 0-25 

 dm. hiuli ; fciin-s ii.terru])tedly pinnate, ///v/-// and .SV///-/T/// jxihr l,c)n<tt)t 

 terminal l.-atl.-t largCj 7- ( .-partt : d, tlie lobes' lance-oblong, incised and toothed ; 

 lateral IcallHs also cut,; petals ilt-ep peach blossom-color. (Sjiiraf-d !<>li<it<t 

 (Jronov. ; riuKiri'i rnhra Hill i Meadows and prairies, I'a. to Mich.. la., Ky.. 

 and Ga. ; also locally established noriheastw. June, July. 



