170 FLOBA OF PHILADELPHIA. 



9. AKGENTTNA Lam. 

 1. Argentina Ansbrina (L.) Bydb. Silver-weed. M. p. 502. Ballast. 

 Summer. 

 Philadelphia— Greenwich Point (Te.). 

 Camden— Kaighn's Point. 



10. POTENTILLA L. CiNQUEPOiL. 



Flowers cymose ; erect or ascending herbs. 



Leaflets 5-7. 1. P. argentea. 



Leaflets 3. 2. P. Monspeliensis. 



Flowers solitary, axillary; creeping or ascending plants. 



Stem, long-assurgent .; first, flower from.tjhe axil of the .second stem-leaf 



or some subsequent "leaf. 3. P. Canadensis. 



Plant low, less than 1 dm. high; first flower from the axil of the first 

 stem-leaf. 4. P. pumila. 



1. Potentilla argentea L. M. p. 503. Dry, 1 barren fields: Summer. 



Sucks— Sellersville (Fr.). Delaware— Swarthmore (Pu.) (Pr.). North- 

 ampton— (P.). 



Camden — Ballast (C). Gloucest er — Mullica Hill (C). Ocean — 

 Forked Kiver (Mac.).' Monmouth — Nortti' side of Deal Lake, Belmar 

 ■ ! (Wn.), Phalanx (C). ' Mercer— TrentOiT (C). Hunterdon— Lambert- 

 ville (C). •>•••' 



2. Potentilla Monspeliensis L. M.. p, 504. Dry soil. Summer. 



3. Potentilla Canadensis L. Wild Strawberry < M. p. 506. Dry soil. 



Summer.' ■• .. \ ■■','..■ ■< <: .■;. ' ■ 



4. Potentilla pumila Poir. M. p. 506. Poor soil. Summer. 



11. WALDSTEINIA 'Willd. "■'■■ " : "! 



1. Waldsteinia pragarioides (.Miehx.) Tratt. Barren .Strwipigrry. M. p'. 

 506. Wobded hillsides. Early summer. 

 Bucks— Sellersville (Fr.). Montgomery— Green Lane' ("VP.). Berks— 

 Hamburg (Cr.). Northampton — Easton (Ca.). 



,.- •". i 'i'i,i . .... ,- ; 



,' 3,2. GETJM.L. Avens. , 



Calyx-lobes .strongly, renexed ; style not plumose, spmetimes, hispid at base. 

 Flowers yellow, 4 mm. broad; head of fruit stalked, calyx bractless. 



1. G. vernurri. 

 Flowers 6-20 mm. broad; head of fruit sessile, calyx bracteolate. 



Petals white, or very nearly so, obovate. 



Plant softly-pubescent or iglabrate;. receptacle bristly. 



2. G. Canadense. 

 Plant rough-pubescent ; receptacle glabrous or downy. ' 



3. G., Virginianum. 

 Petals cream r yellow, narrowly oblong, scarcely exceeding, the sepals. 



... 4. jG. flavum. 



Petals yellow, broadly obovate or orbicular. 



' '■• Segments or lobes of upper stem-leaves broadly rhombic ovate; 

 . petals 4-6uim. long. 5. G. macrophylltm. 



i Segments, or lobes, of upper stem -leaves oblanceolate ; petals 

 6-8 mm. long. 6.. G. strictum. 



Calyx-lobes erect or spreading; style plumose below; flowers ' purple, nod- 

 ding. ' "'•' 7'. G. rwalie.'' 



