3 i6 BOTANICAL GAZETTE [april 



B. coronata (L.) Britton. Fortunately, lack of priority in either 

 case precludes the use of Michaux's name trichosperma, and we 

 thus are able to use names — B. aurea (Ait.) and B. coronata (L.) 

 Britton — that are supported with authentic type or cotype speci- 

 mens still extant and in a good state of preservation. 



The plant with leaves divided into linear segments (Diodonta 

 leptophylla Nutt., Trans. Amer. Phil. Soc. II. 7:360. 1841; Bidens 

 coronata var. leptophylla Mohr, Contrib. U.S. Nat. Herb. 6:808. 

 1901) must properly be designated Bidens aurea (Ait.), var. lepto- 

 phylla (Nutt.), comb. nov. Nuttall's original specimen is still 

 preserved in excellent condition (in Herb. Brit. Mus.). 



University of Chicago 



