H^ botanical gazette. [June, 



the main, and little variation from his descriptions has been 

 made, except in greater fullness and when new material has 

 brought to light additional characters since the publication 

 five years ago. So far as I am aware, no attempt has been 

 made to illustrate the achenia of Coreopsis, and this paper is 

 presented with the hope that it v\ ill aid botanists in determin- 

 ing the species of this genus, as we all know that a good 

 drawing is scarcely less helpful than the specimen itself. 



I have not gone into the troublesome question of nomen- 

 clature, although several changes have been suggested. The 

 achenia vary so much sometimes in the same species, or even 

 in the same head, that a single drawing is not sufficient for 

 proper illustration : for example, figures 3 and 4 are from the 

 same head. Other species are quite constant and can be 

 recognized at a glance. 



I have consulted the following herbaria in the preparation 

 of this paper, and am indebted to those having them in 

 charge for kindly putting them at my disposal : Private col- 



Wm. M 



National 



N 



John M 



help in other ways. 



§ 1. Achenia not vi 

 papillose-roughened. 



at the Department of Agriculture, in 

 Vasey, who has also been a source of 



or slightly papillose-roughened. 



smooth 



C.nudata Nutt. Achenia oblong, i-U lines long, smooth ; 

 the dissected wings but half as broad as body ; awns mosth 

 prominent. (Fig. 1.) 



Dr. Gray, in Synopt. Fl., describes the awns as "two 

 short subulate awns," and Torrey & Grav speak of " awns 

 scarcely exceeding the wing of the achenium," while the 

 recent collections of Chapman and Curtiss, from Apalachi- 

 cola, Fla. (the original station), have awns prominent and 

 exceeding the wing, often appearing more striking than 

 shown in fig. 1. This species seems more closelv related to 

 the two following than to C. rosea, which it resembles onh 

 in the color of the rays and disk flowers. Thus arranged, 

 we have a group of 3 species differing from every other Cor- 

 eopsis in their peculiarly dissected wings. The drawing is 

 from Curtiss 1484, collected near Jacksonville, Fla. 



