"Aristida speciformis" Ell. Bot. S.Car. 1, p. 141; Trin & Rupr. Stip. p. 106. Head of Rio San Pedro, Texas, Nov. 1850, Bigelow. "Aristida purpurea," Nutt. Trans. Amer. Phil. Soc. 5, p. 145; Trin & Rupr. Stip. p. 107. A great number of specimens of, what seem to us, forms of one very variable species, occur in the different collections and none of them are of the typical form of Nuttall, of whose original stove we have specimen. Notwithstanding the diversity in size, the branching of the panicle & length of the arms in the sprenes of the varieties mentioned below there seem no good characters to warrant their separation into species and with the very abundant material before us we feel warranted in reducing many nominal species to varieties of one - which seems to vary largely under the influences of B. Berlandieri "Rudi's contracta", fere lesilitus; glumis trispine dentati" Trin & Rupr. l.c. Texas & New Mexico. River Leone Oct 23d/1850, & Presidio del Norte (a scalyrous form) July 1852, Bigelow; No. 2005 Wright (S'743 col of 1849) There agree with No. 1777 Berlandier, cited by Trin & Rupr l.c. Annulus 457, 949, 2379 & 2551 of Berlandiers are the same as is No. 136 of Lundheimes collection of 1856.