1915] SHERFF—BIDENS 315 
My inability to find MicHavux’s specimen of his Coreopsis tricho- 
sperma in the Michaux collection at Paris (in Herb. Mus. Nat. 
Fic. 3.—Type of Bidens coronata (L.) Britton in Herb. Linn. 
Hist. Paris) makes it impossible to state definitely whether Mr- 
CHAUX’s specimen was Bidens aurea (Ait.), as here introduced, or 
