of the Class Composita. 253 



and having imperfect stamina. The florets of the female capi- 

 tulum differ in the disposition of their laciniae ; for in the central 

 ones the limb is regularly five-cleft, whereas in those of the cir- 

 cumference it is somewhat bilabiate, the inner segment being 

 more deeply separated than the rest. The two sexes of this 

 plant might be readily mistaken for two distinct genera. The 

 Atractylis mexicana of Linnaeus I have ascertained to be the 

 male sex of a third species of this genus. Of this interesting 

 plant, for which I propose the name of Diazeuxis Mutisiana, I 

 have had an opportunity of examining the original sample in 

 the Linnsean herbarium. 



1. D. trinervis, folils lanceolatis acuminatis triplinerviis, floribus 

 solitariis. 

 Aster trinervis. Herb. R. et P. 

 In Guayaquil^ Peruvianorum. Tafalla. Tj . 



Frutex erectus, ramosus, niveo-lanatus, sempervirens, omnium 

 speciosissimus. Kami teretes, striati, lanugine alb^ fugaci 

 vestiti. Folia alterna, breviter petiolata, lanceolata, acu- 

 minata, margine denticulis plurimis acutis ornata, nunc 

 rard integerrima, 5-nervia, nervis lateralibus extimis fere 

 obsoletis, hinc quasi triplinervia, membranacea, basi ob- 

 tusd, supra denudata, laetfe viridia, et lucida, subtiis land 

 implexd copiosissimd nived, demiim fiilvescenti, vestita, 

 3 — 5-pollicaria, pollicem v. sesquipoUicem lata. Petioli 

 supr^ canaliculati, 2 — 3 lineas longi, basi paulo dilatati. 

 Flores terminates, solitarii, sessiles, nutantes, purpurei; 

 fceminei magnitudine et facie ferh Cnici centauroides, dia- 

 metro 2-pollicares ; masculi tripl6 minores. Caetera omnin6 

 ut in charactere generico. 



2. D. ? ser- 



