86 PROCEEDINGS OP THE AMERICAN ACADEMY 



T. iNCANA, Nutt. Depresso-caulescens vel subcaulescens e radice 

 forte monocarpico ; caulibus demum l|-4-pollicaribus ramosis ; foliis 

 striguloso-cinereis vel canescentibus angusto-spatbulatis linearibusque, 

 summis capitulum sessile (semipollicare) fulcrantibus vix superantibus ; 

 involucri bracteis sericeis parum obtusis ; pappo radii eo disci subdi- 

 midio breviore. Trans. Am. Phil. Soc. 1. c. T. Fremontii, Torr. &, 

 Gray in Jour. Bost. Soc. Nat. Hist. v. 108. — Rocky Mountains of 

 Wyoming to Utah and Nevada. 

 -M- ++ ++ Capitula minora (J-poUicaria) inter folia rosulata sessilia : 



herba depresso-multiceps e radice perenni gracili, villoso-lanata : folia 



spathulata, conferta : pappus radii et disci conformis e setis gracilibus 



conjunctim deciduis. 



T. SPATHULATA, Nutt, 1. c. — Rocky Mountains in Wyoming, Nut- 

 tall, Parry. 

 ++ H-+ -H- ++ Capitula parvula (^-pollicaria), hemisphaerica, sa^pius 



brevi-pedunculata : involucrum e bracteis pauciseriatis lato-lanceo- 



latis parum acutis : herbce caulescentes demum ramosae, sestivales. 



= Glabratae, virides, perennes. 



T. GLABELLA. Subsimijlex, pollicaris vel bipollicaris e rhizomate 

 gracili ; foliis crassiusculis spathulatis petioli gracili, summis pedunculo 

 paullo brevioribus ; involucro glabro ; pappo plurisetoso conformi sed 

 radii dimidio breviore, vel diverse in radio brevi-squamellato. — La 

 Pagosa, S.W. Colorado, Newberry, 

 = = Pube tenui strigulosa cinerese : herbte primum exiles simplices, 



demum laxe ramossB 4-10-pollicares : pappus radii semper brevis, 



coroniformi-squamellatus, setis 1-2 brevibus raro additis. — § Nano 



dia, Nutt, 1. c. (Species nimis affines.) 



T. Fendleri, Gray, PI. Fendl. 70. Radice gracili ut videtui 

 perenni ; foliis linearibus ; involucri bracteis inaequalibus triserialibus 

 acutis. — Gravelly hills of New Mexico and S. Colorado. 



T. STRiGOSA, Nutt. 1. c. Radice monocarpico gracili ; foliis prima- 

 riis spathulatis, sequentibus linearibus ; capitulis parum minoribus , 

 involucri bracteis latioribus acutiusculis tantum biserialibus, exteriori- 

 bus brevioribus. — Gravelly hills and plains, Wyoming to New Mexico 

 and Ai'izona. 



T. Mexicana, Gray, PL Fendl. 70, parum differt involucri brao 

 teis JBquilongis obtusissimis. — Saltillo, &c., Mexico, Gregg, Parry. 



ERIGERON. This genus shades off into Aster in more than one 

 direction ; and its subgenus Coenotus fairly runs into Coyiyza. It can 



