82 PROCEEDINGS OF THE AMERICAN ACADEMY 



margine lajvibus ; capitulis ramulos nudos terminantibus ; ligulis albis 

 majusculis ; coroUis disci forte albidis. 



Greenella Arizonica. Near Tucson, S. Arizona, Rev. Edward 

 Lee Greene (an enterprising botanist and most acute observer, to 

 whom the genus is dedicated, and who discovered the plant in the 

 year 1877) ; also J. G. Lemmon, who collected it in a more advanced 

 state in the spring of 1880. If the ray-flowers of this plant were 

 yellow instead of white, it would be referred to the genus Xantho- 

 cephalum, and the habit is nearly that of X. linear if oliuvi and X. seri- 

 cocarpum. But it shows no trace of the glutinosity or balsamic 

 exudation which so largely prevails in the homochromous Asteroidece. 

 And Xanthocephalum has not the peculiar, large and long, much 

 exserted style-ajipendages which are characteristic of the present plant. 



CH^TOPAPPA, DC. — Chcetopappa et Bistasis, DC. ; Benth. & 

 Hook. Gen. ii. 268. The species are 



C. ASTEROiDES, DC. — Arkansas and Missouri to the borders of 

 Mexico. 



Var. iMBERBis. Aristis pappi plane nullis ; paleis latioribus quan- 

 doque coroniformi-concretis. — E. Texas, C. Wright. 



C. Parrti. Major, rigidior, hispidula, nunc glabrata ; involucro 

 turbinato ; ligulis 6-7 ; appendicibus styli fl. disci brevibus obtusissimis ; 

 acheniis glaberrimis, fertilibus fusiformibus subcompressis 4-nervatis ; 

 pappi fl. radii paleis firmioribus cuneiformi-quadratis apice truncato 

 laciniato-fimbriatis, aristis aut nullis aut 1-3 tenellis ; acheniis disci 

 plerisque inanis baud aristatis. Distasis modesta, Gray in Bot. Mex. 

 Bound. 78. — Mt. Carmel on the Rio Grande, Parry. 



C. MODESTA. Involucro late campanulato, bracteis pluribus obtusi 

 oribus ; ligulis 9-20 ; fl. disci 40-60 plerisque fertilibus ; appendicibus 

 styli angustioribus acutiusculis ; acheniis magis compressis ; pappi 

 paleis 5 oblongis eroso-truncatis aristis sat validis alternantibus. 

 Distasis modesta, DC. Prodr. v. 279. — Texas and adjacent Mexico. 



An anomalous Asteroideous Composita was collected on the adobe 

 plains of S. W. Colorado by Mr. Brandegee, of which additional speci- 

 mens are desired. It has the general aspect of some of the pauci- 

 radiate Erigerons, such as Erigeron Bigelovii ; and the characters 

 are of that genus, except that the simple pappus consists of irregular 

 ttwn-bearing palea;. 



TOWNSENDIA, Hook. Ever since the discovery of a consider- 

 able number of species, this very characteristic genus of the Rocky 



