484 ROSACEAE (ROSE FAMILY) 



6 3 Styles filiform, lateral; peduncles axillary, solitary, l-flowered; achenes 

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



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

 runners, white-tome ntose and silky-viUous ; leaves all radical, pinnate ; leaflets 

 7-21 with smaller ones interposed, oblong, sharply serrate, silky-tomentose 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 Eqedii Wormsk., 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. „ , u 



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

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

 and e. Que. , , 



18. P. pumila Poir Stems very slender, soon prostrate and repent, appressed- 

 villoiis, homering from the node above the first well-developed internode ; leaves 

 3-foliolate but apparently 6-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. canadensis L. Suberect (2-7 dm. high) or procumbent, at length 

 often rootin^ 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 

 frlabrate above, canescent-silky to green and merely appressed-viUous on the 

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

 Kan., andsouthw. ^May-July. 



Var. simplex (Michx.) T. «& G. Stem covered with shorter appressed 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; stijmles 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; leaflets S (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. FILIPENDULA [Tourn.] HiU. 



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

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

 5-15, free, 2-ovuled, mostly 1-seeded, indehiscent, compressed, sometunes 

 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. rubra (Hifl) Robinson. (Queen of the Prairie.) Glabrous, 6-25 

 dm. high ; leaves interruptedly pinnate, 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-blossoin-color. (Spiraea lobata 

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

 gjid Ga. ; also locally established northeastw. June, July- 



)iikK. 



