184 PROCEEDINGS OF THE AMERICAN ACADEMY 



S. Arizona, near Camp Grant, Palmer. — The minute pubescence at 

 the base of the perigonium, and the tuft of most delicate cobwebby hairs 

 on the centre of the disk of the exterior segments, have been over- 

 looked. Pedicels and involucre often obscurely viscid-glandular ; the 

 latter a line long. 



67. E. Thomasii, Torr. in Pacif. R. R. 4, p. 364. Foliis rotun- 

 datis ovatisque ; bracteis ad nodos paniculas effusas minimis ; involucro 

 paucifloro ; bracteolis paleaceis margine parce longe villosis ; perigonio 

 albo vel flavido (vix semilineam longo) basi tenuiter hispidulo, seg- 

 mentis disparibus subpanduratis sequilongis apice parum dilatatis 

 obtusissimis, exterioribus basi latiore demum subcordatis, interioribus 

 dimidio angustioribus sublineari-oblongis. — Fort Yuma, S. E. Cali- 

 fornia, Gen. Thomas ; very slender specimens, not a span high, with 

 almost capillary scape and panicle, also larger but less developed 

 specimens: Fort Mohave (Fremont, locality not given), Cooper; larger 

 specimens : Camp Grant, Arizona, Palmer ; very slender form. Invo- 

 lucre little over half a line in length. 



68. E. pusillum, n. sp. Foliis rotundis obovatisque in petiolum 

 sa^pius angustatis ; bracteis parvulis quaternis ad nodos basique 

 panicuke subsimplici ; involucro fere hemisphasrico 10 - 15-floro minu- 

 tim glanduloso ; bracteolis obovatis spathulatisque inferne laxe ara- 

 neoso-lanatis ; perigonio aureo (nunc purpureo tincto lineam longo 

 (extus tenuiter glanduloso-puberulo profunde 5-partito, segmentis fere 

 conformibus, exterioribus ovali-obovatis quam interiores oblonga paullo 

 majoribus. — Foot-hills of Trinity Mountains, borders of the Truckee 

 Desert, Nevada, S. Watson in C. King's Expedition. From two inches 

 to a span high ; the involucre barely a line long. To this probably 

 belongs a specimen from " Bearside Mountain " in the same region, 

 coll. Newberry ; but the involucres are smaller and few-flowered ; the 

 flowers, however, "yellow." 



69. E. reniforme, Torr. in DC. 1. c. Foliis reniformi- vel cor- 

 dato-orbiculatis dense mollissime albo-lanatis ; bracteis parvulis lanatis ; 

 involucris late campanulatis haud glandulosis 8-12-floris; bracteolis 

 prrecedentis ; perigonio ut videtur albo vel subroseo (semilineam 

 longo) glabro, segmentis ovatis, interioribus paullo minoribus. — S. E. 

 California, probably on the Mohave, Fremont. Fort Mohave, Cooper. 

 Arizona, Palmer. All scanty and incomplete specimens. Involucre 

 about a line long, sometimes seemingly much smaller and fewer- 

 flowered. 



