OF ARTS AND SCIENCES. 95 



E. Bellidiastrujm, Nutt. Trans, Am. Soc. 1. c. — Low plains of 

 Nebraska to New Mexico. 



«: * Achenia compressa generis : pappus duplex, exterior brevissimus, 

 setulis squamellisve numerosis nunc in coronulam pi. m. concretis. — 

 § Phalacroloma, Torr. & Gray, Fl. 



•*- Pappus conformis : folia pleraque integerrima : plantas humiles. 



-H- LiguljB 30-40, albfe. 

 E, MODESTus, Gray, PI. Fendl. 68, excl. syn., & PI. Lindh. ii. 220. 

 — Sterile plains, W. Texas. 



++ ++ Ligulfe circiter 100, angustse. 



E. DiVERGENS, Torr. & Gray, Fl. ii. 175, et var. cinereus. 

 E. cinereus, Gray, PI. Fendl. E. nudijlorus, Buckley in Proc. Acad. 

 Philad. — Nebraska to California and Mexico. 



E. tenuis, Torr. & Gray, 1. c. — Arkansas, Louisiana, and Texas, 

 in low grounds. 



•I— -I— Pappus interior setosus in radio nullus, vel parcissimus caducus : 

 ligulse 50-80, albae, nunc purpurascentes (lin. 3 longge) : caules 

 erecti, 1-4-pedales, folia plurima indivisa et capitula parvula sat 

 numerosa gerentes. — Phalacroloma, Cass. 



E. ANNUus, Pers. ; Torr. & Gray, 1. c. ubi synon. — Canada to Vir- 

 ginia and west to Oregon. 



E. STRIGOSUS, Muhl. ; Torr, & Gray, 1. c. — Canada and Saskatche- 

 wan to Texas and California. 



Var. Beyrichii, Torr. & Gray. — Arkansas and Texas. 

 -^ -1— -I— Pappus radii ut disci perfectus, interior caducus, exterior e 

 squamellis insigniter concretis : folia caulina pinnatipartita : ligulse 

 numerosissimae angustae. — Stenactis, Cass. Polyactis, Less. Poly- 

 actidium, DC. 



E. delphinifolius, Willd. New Mexico, Arizona, Mexico. 



§ 2, Trtmorph^a. Flores freminei sjepissime biformes, exteriores 

 angustissime et breviter aut brevissime ligulati, interiores corolla fili- 

 forrai tubulcsa stylo multo breviore : folia subintegerrima. — Trimor- 

 phcea, Cass. 



* Caules humiles ssepius monocephali e rhizomate perenni : ligulae 

 exsertse, tubo pilis parcis elongatis pluriseptatis instructo. 



E. alpixus, L. — Alpine region of the northern Rocky Mountains, 

 Drummond. 



