178 PROCEEDINGS OF THE AMERICAN ACADEMY 



floris brevissirae 5-dentatis cum ramis tenuissimis panicula; effuso- 

 decompositre glabris ; perigonio glaberrimo, segmentis exterioribus late 

 obovatis, interioribus angustioribus. — Washington Territory to Cali- 

 fornia and Nevada ; apparently very common. Involucre slender, 

 about a line and a half or sometimes two lines long. 



++ ++ ++ Involucra pauci- vel subpluriflora, oblongo-campanulata, 

 subturbinata, 5-dentata, circa lineam longa, secus ramulos tenues 

 panicuke plerumque ramosissimze dissita vel sparsa. Perigonium 

 glabrum, post anthesin involucro brevius, segmentis interioribus 

 angustioribus. Folia subtus albo- supra srepiusque cum ramis et 

 involucris floccoso-lanata, nunc omnia radicalia, nunc plus minus 

 caulina. 



54. E. gracile, Benth. Bot. Sulph. & in DC. 1. c. Ssepius 

 ramosissimum, panicuke ramis patentibus ; foliis ovatis, oblongisve ; 

 bracteolis in involucro brevibus tenuiter subglanduloso-barbellatis ; 

 perigonii (albi vel rosei) segmentis exterioribus obovatis, interiori- 

 busve oblongis. — California and Nevada, apparently common and 

 widely variable ; some of the glabrate forms approaching E. vimineum, 

 which has similar only minutely barbellate bractlets at the base of the 

 pedicels. Bentham's original plant has leaves on the lower nodes. 



Var. /3. effusum : humile ; panicula decomposita patentissima 

 involucrisque sa3pius glabratis ; foliis omnibus radicalibus. — Chiefly 

 southward, and in Nevada ; the involucres and flowers sometimes 

 rather large for the species, sometimes very small. 



Var. y. leucocladon (E. leucocladon, Benth. PI. Hartw. p. 333, 

 & in DC. 1. c.) : albo-lanatum ; caule nudo subsimplici ; ramis pani- 

 cula? paucioribus strictiusculis ; floribus albis. 



Var, 8. acetoselloides {E. acetoselloides, Tovw in DC. 1. c.) : albo- 

 lanatum ; caule longe usque ad paniculam subsimplicem foliato ; floribus 

 rubentibus. — California, Fitch, Shelton, only in herb. Torr. ; and Remy 

 collected a form connecting with the preceding. 



55. E. polycladon, Benth. in DC. Lana persistente dealbatum ; 

 caule 2 - 3-pedali usque ad paniculam amplam strictiusculam foliato ; 

 foliis oblongis obovatisque ; bracteolis in involucro pilis tenuissimis 

 longissimis parciusculis villosis ; perigonii albi segmentis exterioribus 

 flabellato-cuneatis, interioribus obovato-spathulatis, utrisque basi at- 

 tenuates. — S. W. Texas, Wright, to Chihuahua, Potts (E. helian- 

 themifolium, Benth. in DC. Prodr., quoad pi. " herb. Scheer,") and Ari- 



