170 PROCEEDINGS OF THE AMERICAN ACADEMY 



cumbentibus. Caules inferne saspius foliosi. Folia plerumque an- 

 gusta et alterna, etiam radicalia hand cordata, subtus vel utrinque 

 pi. m. albo-lanata. 



* Fruticuli, nunc caulibus abbreviatis parum suffruticosis. Peri- 

 gonia intus glabra, segmentis subsimilibus. Ovarium superne ad 

 angulos ssepe scabridum. 



•»- Rami lignosi erecti vel adsurgentes, foliosi, pedunculo cymifero 

 aut brevi aut longiusculo terminati. Flores albi vel rosei (raro in 

 eadem speciei lutei) ; perigonio basi post anthesin srepius eras- 

 siusculo, segmentis obovatis saltern interioribus emarginatis vel 

 retusis. 



37. E. eric^efolium, n. sp. Depressum, tortuoso-ramosissimum ; 

 foliis in ramulis creberrimis subulato-linearibus (lin. 2 longis) supra 

 glabris subtus albo-lanatis sed ob margines maxime revolutos quasi 

 teretibus subtus leviter canaliculars ; cyma in pedunculo vix ultra folia 

 suprema exserta parva ex involucris 3-7 confertis tomentulosis penta- 

 gons breviter 5-dentatis ; floribus albis sesquilineam longis. — Arizona, 

 near Fort Whipple, Drs. Coues and Palmer, Sept. 1865. The branches 

 or stems we possess are barely a span long, rigid, and wholly fruticu- 

 lose. Involucre a line and a half long. Segments of the perigonium 

 all nearly alike, dilated-obovate. 



38. E. corymbosum, Benth. in DC. Sesqui-bipedale, floccoso- 

 lanatum ; ramis validis alte foliosis ; foliis oblongis subundulatis (8-18 

 lin. longis) ; cyma late corymbosa floribunda ; floribus ut videtur albis 

 sesquilineam longis. — Utah and W.. New Mexico, Fremont, Beck- 

 with, Newberry (San Juan River, in Macomb's Expedition), Whipple. 

 The var. divaricatum, Torr. & Gray, Pacif. R. R. 2, p. 129, & 4, 

 p. 131, is not unlike Fremont's, but in better specimens, and much 

 whitened by the more persistent floccose wool. Cyme broader and 

 fuller than in the broadest-leaved forms of the next species, which 

 approach this ; but the flowers mostly twice as large, and the stem and 

 branches stouter. 



39. E. microthecum (or microtheca), Nutt. PI. Gamb. p. 162. 

 Humilius, vix ultrapedale, a basi ramosissimum, tomeuto floccoso nunc 

 tenuiore ; foliis angusto-oblongis linearibusque ; cyma aut confertiflora 

 aut effusa ; floribus albis nunc roseis raro luteis haud ultra lineam 

 longis. — Mountains or high plains, Nebraska to New Mexico, the 

 interior of Northern California, and Oregon. This includes a variety 



