Planta Lindheimeriana. 233 



Texas, render it doubtful, however, whether this plant is spe- 

 cifically different. 



17-2. Geiseleria glandulosa, Klotzsch, in Erichs. Ar- 

 chiv. I. (1841) p. 254. Dry woods, Houston. May, June. 

 The calyx of the sterile flowers is 5-parted, and the stamens 

 9 or 10. 



173. Croton argyranthemum, Michx. Margin of woods, 

 Houston. April — June. The ovary is on an orbicular, not 

 5-glandular disk. 



174. Euphorbia bicolor (n. sp.) : annua ; caule erecto 

 foliis bracteisque undique villosis seu pilosis ; foliis subsessili- 

 bus oblongo-lanceolatis vel lineari-oblongis cuspidatis basi ob- 

 tusis ; bracteis lineari-ligulatis elongatis basi attenuatis margine 

 membranaceis decolorato-albidis ; glandulis involucri villosi 

 margine petaloideis suborbiculatis ; capsulis dense lanatis ; 

 seminibus sparsim rugulosis. ft concolor : marginibus deco- 

 loratis bractearum angustissimis aut subnullis ; foliis latioribus. 

 Prairies near Houston. June — September. Also Texas, 

 Drummond. Arkansas, Beyrich, &c. A handsome species, 

 resembling E. marginata, but distinguished by the narrower 

 hairy leaves, much narrower bracts, &c. 



175. Aphora mercurialina, Nutt. in Trans. Amer. 

 Phil. Soc. (N. Ser.) 5, p. 174. Serophyton pilosissimum, 

 Benih. Bot. Voy. Sulphur, p. 53. In denudated soil, dry 

 prairies, &c. Arkansas and Texas. May — July. Endlicher 

 having entirely overlooked this genus of NuttalPs, Mr. Bentham 

 has lately characterized it anew under the name of Serophyton. 

 To his excellent character we have only to add, that the 

 plants are sometimes dioecious, or subdioecious, as, indeed, is 

 mentioned by Nuttall in the case of the original species. 

 What Nuttall takes for sterile filaments in the fertile flowers, 

 Bentham describes as petals, and so NuttalPs name becomes 

 unmeaning, which, however, is no great objection. Mr. 

 Bentham's Californian species must, therefore, bear the name 

 of Aphora lanceolata. His remaining Texan species, the 

 Aphora Drummondii, was also collected by Lindheimer, but 



vol. v. 16 



