176 PROCEEDINGS OP THE AMERICAN ACADEMY 



++ ++ Caulescentia, cliff u so-panic u lata. 



49. E. Wrightii, Torr. in DC. 1. c. E basi suffruticosa raraosum, 

 1 - 2-pedale ; ramis inferne foliosis ; foliis oblongo-ovatis vel sub- 

 lanceolatis basi angustatis utrinque vel subtus albo-lanatis (6-12 lin. 

 longis), minoribus ssepe in axillis fasciculatis ; panicula dicbotome 

 ramosa ; involuci-is parvi-bracteatis secus ramos rigidulos laxius spicatis 



5 - 6-dentatis (lin. 1 - 1 \ longis) ; perigonii (lin. 1-1^- longi) segmentis 

 lato-obovatis vel exterioribus suborbiculatis ; ovario superne praesertim 

 ad angulos birtello-scabro. E. Wrightii (Torr.), trachygonum (Torr.) 



6 helianthemifolium, Bentb. in DC. 1. c. — S. W. Texas to Arizona, 

 Nevada, and California, Wright, Parry, Thurber, Newberry, Palmer, 

 Torrey, Brewer, &c. But Scheer's plant from Chihuahua appears to 

 be E. potycladon, Benth. A polymorphous species. The E. trachy- 

 gonum has larger and more numerous flowers ; var. Jloccosum, Benth. 

 shorter involucres ; and a depauperate form from Nevada (Anderson, 

 Bloomer, Torrey, Brewer) very short leafy branches and more scape- 

 like peduncles. 



* Annua, vel in spec, prima forte perennantia. Flores parvi, albi 

 vel rosei, basi acuti vel acutiusculi. Bractere parvae, adpressae. 



-t- Involucra tubulosa, lin. 3^-2 longa, in depauperatis E. viminei 

 vix minora, adpressa. 



■►+ Pluriflora, canescenti - lanata, secus ramos plerumque subsim- 

 plices dissita. Perigonium glabrum (lin. 1 - 1 \ longum), segmentis 

 obovatis fere sequalibus. Plantse juniores omnino albo-lanataa, 

 tomento caulium, etc. demum floccoso rarius deciduo. 



50. E. elongatum, Benth. Bot. Sulph. & in DC. 1. c. Caulibus 

 ramisve virgatis e basi indurascente (vix perenni ?) sesqui-tripedalibus 

 nudis basim versus foliis oblongo-lanceolatis petiolatis parce nunc par- 

 cissime instructis ; involucris 3 - 3£ lin. longis sat multifloris secus 

 ramos simplices strictos spicatis remotis, ore repando-truncato ; brac- 

 teolis sursum parce villoso-barbatis ; perigonio albo vel subroseo ; 

 ovario glabro. — California, plains and hills, from Monterey to San 

 Diego, &c. Dr. Torrey, in Bot. Mex. Bound, and Ives Exped., 

 refers this to E. virgatum, to which indeed it is related, and the root 

 probably is not really perennial. Besides the greater size and stout- 

 ness, and the more numerous flowers in the involucre, the achenium is 

 more tapering, the embryo of twice the size, a line or more in length, 

 and the radicle springs from near the uppermost part of the oval- 

 orbicular cotyledons. 



