of the Class Composita. 253 



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

 tulum differ in the disposition of their lacinia: ; 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, foliis lanceolatis acuminatis triplinerviis, floribus 

 solitariis. 

 Aster trinervis. Herb. R. et P. 

 In Guayaquil^ Peruvianorum. Tafalla. ^ . 



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

 speciosissimus. Rami 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- 

 tus4, supra denudata, laete viridia, et lucida, subtus lan& 

 implex^, copiosissim& nive&, demum fulvescenti, vestita, 

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

 supra canaliculati, 2 — 3 lineas longi, basi paulo dilatati. 

 Flores terminales, solitarii, sessiles, nutantes, purpurei ; 

 faiminei magnitudine et facie fere Cnici centauroides, dia- 

 metro 2-pollicares ; masculi triplo minores. Castera omnino 

 ut in charactere generico. 



2. D. ? ser- 



