422 PROCEEDINGS OF THE AMERICAN ACADEMY 



Keerlia Mexicana, Gray, n. sp. Hirsuta ; caulibus (pedalibus) 

 e radice perenni assurgeutibus subsimplicibus pedunculo monocephalo 

 elon^ato terminatis inferne foliis sat crebris linsfulatis membranaceis 

 obsitis : involucro Bellidiformi lato-campanulato e bracteis pluribus 

 lineari-lanceolatis acuminatis a^quilongis ; ligulis 20-30 linearibus 

 albis ; floribus disci totidem fertilibus ; receptaculo plaiiiusculo ; ache- 

 niis obovatis crassis epapposis (maturis fere lin. 2 longis), faciebus 

 unicostatis et subiiervatis. — Rio Blanco, on grassy hillsides ; July. 

 046.) This species is intermediate between Bellis and Keerlia, but 

 the shape and nervation of the achenes and the flat or barely convex 

 receptacle indicate the latter genus, although the involucre is that of 

 the former. 



Aster spinosus, Benth. Rio Blanco, in a deep barranca ; Octo- 

 ber. (650.) 



Erigeron exilis, Gray, n. sp. E. hyssopifoUi ut videtur consors, 

 E. tenello, DC, baud dissimilis, forte perennis, striguloso-puberulus ; 

 caulibus filiformibus rigidulis ultraspithamreis equaliter foliosis ; foliis 

 (majoribus pollicaribus) oblanceolato-linearibus integerrimis acutis basi 

 attenuatis subsessilibus : pedunculis solitariis filiformibus ; involucro 

 (lin. 2 longo) glabriusculo ; ligulis sat numerosis linearibus (lin. 2 

 longis) albis ; pappo simplici. — Rio Blanco, in shady ravines; June. 

 (63.) 



Erigeron delphinifolius, Willd. Rio Blanco, on grassy hill- 

 sides ; July. (166.) 



Erigeron scaposds, DC. Guadalajara, in rich grassy bottoms ; 

 July. (229.) 



Erigeron (L^ennecia) gnaphalioides, HBK. Nov. Gen.& Spec. 

 4. 88, t. 331. Rio Blanco, sides of ditches ; September. (561.) 



Baccharis pteronioides, DC. Prodr. 5. 410. (B. ramulosa, 

 Gray.) Rio Blanco ; June. (5, 6.) — Used as fuel in burning bricks 

 and pottery ; " Tepopote," as also the next. 



Baccharis iieterophylla, IIBK. Rio Blanco; June. (7,8.) 

 — Used like the last. 



Baccharis thesioides, HBK. Rio Blanco, on hillsides; Sep- 

 tember and October. (536, 744.) 



Baccharis mucronata, HBK. Rio Blanco, sides of ravines ; 

 October. (737.) — B. Seemanni is probably the same as B. squar- 

 rosa, HBK., which is an herbaceous species of the Ai-rhenachne sec- 

 tion, with very imbricated involucre. 



Gnaphalium leptophyllum, DC. Prodr. 5. 226. Rio Blanco, in 

 moist place.s ; July. (155.) 



