414 W^iEGAXD : Some Species of Bidens 



obtuse (7-8 mm. long): ray flowers rarely present, ligulc golden- 

 yellow, oblong, one half longer than the disk, ovary short and 

 broad, awnlcss, hairy : corolla of the disk flowers of medium size 

 (2.5-3.5 mm.), equaling the awns, upf^r portion oblong, 5- 

 toothed, abruptly contracted into a lower portion which is as long- 

 as the upper: stamens exserted : mature achenes (4-6 mm. long)^ 

 cuncate, very slightly contracted at the top, outer 3-angled and 

 often 3-awned, nmer 4-angled and 4-awned, dark-green or black, 

 covered with brcwn or yellow warts, slightly hairy, barbs on the 

 margins either erect or rctrorse even upon the same achene, sum- 

 mit sliglitly convex; awns %-% the length of the achene, down- 

 wardly (rarely upwardly) barbed. 



Massachusetts and New Hampshire to Virginia and westward to 

 Missouri and Minnesota. 



Specimens examined from : — Massachusetts : Rich, Collins^ 

 Boott, WiHiaiiis, ct aL New Hampshire : Dcane. Rhode Island : 

 Providence, Thurbcr. Connecticut : Eaton (with rays). New 

 York : Tou^uscmf, Vail^ et aL (many from Ithaca). Ontario : Lake 



E 



Erie, Macoun ; St. Catharines, McCalla, New Jersey : Torrcy ; 

 Nasli. Virginia : Curtiss. Ohio : Sclby, no. 6 (up-barbed). Illi- 

 nois : \VolJ\ no. 155; Hall, Missouri: Bush^ wo. '}^6. Minne- 



sota : Taylor, 



BiDENS coNNATA piNNATA Watsou, A. Gray, Man. Bot. 2S4. 1890 



[ed. 6]. 



Stem rather stout (40-70 cm.), much branched from near the 

 base : leaves pinnatcly divided into from 4 to 6 pairs of narrowly 

 hncar (10-20 mm. long), acute, entire or incised distant divisions : 

 heads numerous, similar to the type ; chaff reddish tipped : 

 achenes small, blackish, nearly smooth ; awns slender, downwardly 

 barbed as are also the margins of the achenes. 



Vicinity of St. Paul, ]\Iinncsota. 



Specimen examined : Richfield, Minn., Couillard, (type). 

 (Also Ramsey Co., Sandbcrg, Minn. Bot Stud., p. 572.) ^ 



Bidens connata is apparently confined entirely to the Northern 

 States and is not found in the South as has heretofore been sup- 

 posed. The southern plant seems in all case to be B, coniosa in- 

 stead. B, connata is very common throughout New England, the 

 IMiddle States and the Mississippi valley, growing preferably in very 

 wet soil, and is characteristic of ditches and wet swamps. 



