OF ARTS AND SCIENCES: JANUARY 26, 1870. 189 



Nuttall, Geyer. An inch to a span high. Perigonium in fruit barely 

 a line long. 



* * Rumiciflora: involucra plus minus pedunculata, multiflora, 

 profunde 5 - 8-fida, lobis linearibus foliaceis. Perigonii peta- 

 loidei segmentis disparibus, exterioribus basi cordatis. Folia 

 inferiora lata. 



79. E. Abertianum, Torr. in Emory, Reconn. ; Benth. in DC. 

 1. c. Yillosum seu laxe molliterque pubescens, paniculato-ramosum ; 

 ramis fere ad apicem saspius foliatis erectis; foliis inferioribus ovatis 

 vel subcordatis longius petiolatis ssepius undulatis, ramealibus lanceo- 

 latis linearibusve subsessilibus ; pedunculis alaribus inferioribus ple- 

 rumque gracilibus, superioribus involucro sequilongis vel brevioribus ; 

 perigonii glabri rosei segmentis exterioribus orbiculatis sinu profundo 

 clauso cordatis quam interiora lineari-oblonga subpandurata apice 

 retusa multo latioribus. — W. Texas (Wright) to Chihuahua, Arizona, 

 &c. : apparently common. A span to a foot high, very variable in 

 size, foliage, &c. The enlarged exterior segments of the perigonium 

 become nearly two lines long, the lobes at the deeply cordate base cov- 

 ering the small and narrow tube of the perigonium. 



* * * Spergulina: involucra effuso-paniculata in pedicellis lasvibus 

 capillaribus, parva, pauciflora, 5 - 8-fida. Perigonia petaloidea, 

 segmentis haud cordatis. Caules gracillimi, internodiis elongatis : 

 folia caulina angusto-linearia, marginibus nunc revolutis. 



80. E. pharnaceoides, Torr. in Sitgreaves Rep. p. 167, t. 11, & 

 in DC. 1. c. Pubescens ; foliis subtus cano-tomentosis supra glabres- 

 centibus ; involucris 5 - 8-fidis 8-12-floris; bracteolis filiformibus 

 villosis ; perigonio glabro albo vel roseo, segmentis exterioribus latis- 

 sime ovatis concavis, fructiferis basi bigibbosis quam interiora oblongo- 

 linearia retusa brevioribus ; antheris nigricantibus. — New Mexico and 

 Arizona, Wright, Bigelow, Sitgreaves, Thurber, Coues and Palmer. 

 Commonly about a foot high ; with leaves about an inch long and a 

 line or less in width. Pedicels one or two inches, and involucre one 

 or two lines long. Perigonium when accrescent a little over a line 

 in length. 



81. E. spergulinum, Gray in Proceed. Amer. Acad. 7, p. 389. 

 Tenuius ; foliis cum basi caulis parce hirsutis glandulosisque utrin- 

 que viridibus ; panicula magis eflfusa, pedicellis tenuissimis ; involu- 



