186 PROCEEDINGS OF THE AMERICAN ACADEMY 



a foot high, with sparse involucres. Fresh specimens of this little- 

 known species are most desirable. The root plainly is not peren- 

 nial. 



+. +_ +_ Minus ramosa nunc oligocephala, pcdicellis elongatis erec- 

 tis. Involucra H-21 lin. longa, pluri-multiflora. Perigonium 

 glabrum, basi brevi turbinata. Bracteae minima?. Bracteola? in 

 involucro villosre. Perennia seu biennia, foliis baud cordatis, 



73. E. tenellum, Torr. in Ann. Lye. N. Y. 2, p. 241. Caudice 

 suffruticoso multicipiti csespitosum ; foliis confertissimis ovatis nunc 

 rotundis longius petiolatis utrinque albo-tomentosis ; scapo seu pedun- 

 culo ramis panicuke 2 - 3-dichotoma3 sparsis pedicellisque elongatis 

 gracillimis lasvibus ; involucro turbinato-campanulato (1^-2 lin. longo) 

 vix plurifloro ; perigonio petaloideo albo 6-partito, segmentis disparibus 

 retusis vel emarginatis, exterioribus late obovatis seu orbiculatis quam 

 interiora lineari-oblonga paullo breviora post anthesin conniventia 

 multo majoribus. — Colorado, at the base of the Pocky Mountains to 

 N. New Mexico and W. Texas. The original E. tenellum, which de- 

 serves the name, is the smallest and most slender, wholly acaulescent 

 form, coll. in Colorado and New Mexico by James, Emory, Fendler, 

 Bigelow, and Parry ; the scape with the rather simple panicle hardly 

 a foot high, the blade of the leaves less than half an inch long, the 

 flower a line or in fruit a line and a half in length. Var. leptocladon, 

 Benth. (W. Texas, Wright), is simply larger and more robust, the 

 ampler and more compound panicle attaining a foot and a half or two 

 feet in height. 



Var. caulescens (var. y. ramosissimum & E. phztyphyUum (Torr.), 

 Benth. in DC.) : ramis e caudice lignescente adsurgentibus (4 - 10 

 poll, longis) foliosis; foliis srepe majoribus lamina nunc ultra semipol- 

 licari ; panicula ampliore floribunda ; involucro et perigoniis fructiferis 

 lin. l£-2 longis. — W. Texas, Riddell, Wright, Lindheimer, and 

 Parry; specimens collected by the latter passing into the ordinary 

 E. tenellum by the scapelike peduncle and small panicle. 



74. E. ciliatum, Torr. in DC. 1. c. Radice bienni seu annua ; 

 foliis radicalibus rosulatis obovato-spathulatis in petiolum marginatum 

 attenuatis prater margines costamque barbato-ciliatos glabris ; scapo 

 pedunculisque paucis elongatis ; involucro late campanulato multifloro 

 (lin. 2 longo) ; perigonio atro-rubente crassiusculo 6-fido basi turbinato, 

 segmentis ovatis acutis, interioribus post anthesin paullo angustioribus 



