484 KOSACEAB (_KOSB FAMILY^ 



§ 3. Styles filiform., lateral; peduncles axillary, solitary, 1-flowered ; achenes 

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



17. P. Anserina L. (Silver Weed.) Spreading by slender many-jointed 

 runners, white-tomentose and silky-villous ; leaves all radical, pinnate ; leaflets 

 7-21, with smaller ones interposed, oblong, siiarply serrate, silky-toraentose at 

 least beneath ; bractlets and stipules often incisely cleft ; peduncles elongated. 

 {Argentina Rydb.) — 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 Wormsk., at least as to forms in our range, appears to be a dwarf 

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

 state in rich meadows. 



Var. cdncolor Ser. Leaflets silky-canescent above as well as beneatb. — 

 Common in the Rooky Mts., and in less pronounced form from n. N. Y. to n. Me. 

 and e. Que. 



i^ 18. P. pQmila Poir. Stems very slender, soon prostrate and repent, appressed- 

 villous, ^owenng' /rom the node above the first well-developed internode; leaves 

 3-foliolate but apparently 5-foliolate by the parting of the lateral leaflets ; leaflets 

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

 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. caeoliniXna Poir. 



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

 often rooting at the tip ; stem spreading-hirsute, flowering from the node above 

 the second well-developed internode , 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 soU, 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 oppressed or sub- 

 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, 

 prostrate and usually repent; leaves much as in P. pumila; the leaflets green 

 on both faces, sparingly strigose-pubescent or glabrate, cuneate-oblanceolate, 

 crenate-dentate nearly or quite to the base ; stipules usually small and incon- 

 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 N. J. and O. June. (Adv. from Eu.) 



21. P. PROCUMBENS Slbth. Similar, strigose-pubescent ; Zea/ets 3 (rarely 5) , 

 cuneate-obovate, coarsely incised chiefly above the middle ; stipules conspicuous ; 

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

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



16. FILIPfiNDULA [Tourn.] Hill. 



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

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

 6-15, free, 2-ovuled, mostly 1-seeded, indehiscent, compressed, sometimes 

 twisted. — Perennial herbs, with pinnate leaves and panicled cymose flowers. 

 Stipules kidney-shaped. (Name from filum, a thread, and pendulus, hanging, 

 in allusion, it is said, to the roots.) 



1. F. libra (HiU) Robinson. (Qdebn of the Prairie.) Glabrous, 6-25 

 dm. high ; leaves interruptedly pipnate, green and scarcely paler beneath ; 

 terminal leaflet large, 7-9-parted, the lobes lance-oblong, incised and toothed ; 

 lateral leaflets also cut ; petals deep peach-blossoni-color. (Spiraea lobata 

 Gronov ; TJlmaria rubra Hill.) — Meadows and prairies, Pa. to Mich., la., Ky., 

 and Ga. also locally established northeastw. June, July. 



