200 PROCEEDINGS OF THE AMERICAN ACADEMY 



Hymenothrix Gray, PL Fencll. p. 102, & PI. Wright, 2, p. 97. By 

 the admission of the above-mentioned perennial species into Schkuhria, 

 the difference between that genus and the present is lessened ; but still 

 this should hold, H. Wrlghtii being especially peculiar, and the original 

 H. Wislizeni nearer to it than to any thing else. It should be noted 

 that the flowers of H. Wrightii are not yellow, as in the other, but 

 pale purple or flesh-color. 



Blexnosperjia Less. This genus seems to have no very evident 

 relationship to those with which it is associated in the Genera Plau- 

 tarum. In the character no mention is made of three peculiarities : 

 1. the completely sessile ligule; 2. the inner row of pistillate apetalous 

 flowers, which appear to be constant in the Californian sjiecies ; and 

 3. the jDOwdery papilla of the achenium and their development of 

 delicate threads when wetted, forming a gelatinous mass, as in Croci- 

 dium and other Seuecioneous Compositse, and which indicate an affinity 

 in that quarter. 



Chjenactis DC. well includes Acarphcea Gray. Few if any of the 

 species have perennial roots. G. carphoclinia Gray _ is an anomaly 

 in the tribe on account of the palece of the receptacle. 



NicOLLETiA Gray. This (not Nicolettia) is the proper orthography 

 of the name of this genus, which was dedicated to the memory of T. N. 

 KicoUet, under whom Fremont performed his first service in survey and 

 exjjloration. 



Dysodia Cav. Although the pappus generally consists of only 10 



apice cor3^mboso-l-5-cephalis ; foliis alternis crassiusculis coriaceis ovalibus nunc 

 oblongis leviter trinerviis integerrimis in petiolum gracile subito angiistatis ; 

 invohicri liemisphaerici squamis 10-14 oblongo-lanceolatis aciitis disco breviori- 

 bus ; ligulis 6-9 exsertis oblongis sajpe 3-clentatis ; acheniis lineari-cuneatis 

 4-gonis ; pappi paleis lineari-lanceolatis hyalinis costa valida excurrente vel 

 procurrente subaristatis, vel mucronatis vel fl. exterioruni oblongis omninc 

 muticis. — Denudated high plains and valleys in tlie Rocky Mountains of 

 Wyoming, Valley of Wind River, &c. ; Dr. Tarry, coll. 1873, no. 150. 



Var. oiiLOXGiFOLiA, minor ; caule sat folioso ; foliis lanceolato-oblongis ; floribus 

 in capitulo angustiori minus numerosis. — Hillsides in the valley of San Juan 

 (Utah or New Mexico), Newberry in McComb's expedition. Head in specimen 

 of this form (which has been for several years in the herbarium) barely 5 lines 

 high and rather narrow ; but in Dr. Parry's plant half an inch high and much 

 broader. In the latter the flowering stems are usually scapiform, with some small 

 bracts in place of leaves ; the blade of the tufted radical leaves an inch to an 

 inch and a half long, and about half as wide. Flowers yellow : disk-corolla with 

 broadly funnel-form 5-lobed limb from a narrow tube. Style-branches capitate- 

 truncate, with a short conical apiculation. 



