V. PLANTS WRIGHTIAN^. 121 



376. Florestina tripteris, DC, var. pappi paleis brevioribus obtusissimis vel re- 

 tusis basi callosa in nervum vix vel baud producta. — Prairies bej'ond the Pecos ; 

 Aug. " Flowers purple." — The pappus is composed of shorter and rounder scales 

 than in Berlandier's plant ; by no means " acute and with a thickish mid-nerve," as 

 described by De Candolle. In comparing it with Berlandier's plant, I find that, 

 while some flowers of the latter have oblong and acutish paleae, with a sti'ong mid- 

 nerve, others have them obovate and obtuse, with the nerve vanishing above the 

 middle ; and there is no difference in other respects. The pappus doubtless varies 

 as it does in Palafoxia Texana and P. callosa. 



377. Palafoxia (Florestinaria) callosa, Torr. 8c Gray, Fl. 2. 369. Florestina 

 callosa, DC. Cliffs of Turkey Creek, and on the Rio Grande, Texas. 



t P. callosa, var. pappo aut minimo aut plane nuUo. — Austin, Texas. — The 

 achenia ai*e pubescent in the plant with a very short pappus, as in the ordinary state 

 of the species. They are glabrous in a variety which is destitute of pappus, at 

 least in specimens raised in the Cambridge Botanic Garden. 



378. Hymenopappus flavescens. Gray, PL Fendl. p. 97. Valley of the Rio 

 Grande, fifty miles below El Paso; Sept. Also in the collection of 1851. — The 

 lobes of the leaves are finer than in Fendler's No. 464, but much as in his No. 463 ; 

 and even the rameal leaves are pinnately parted. 



•j- H. coRYMBosus, Nutt. ; Torr. ^ Gray, Fl. 2. p. 370 ; Gray, PI. Lindh. 2. i). 

 230. Austin, Texas. 



379. Bahia absinthifolia, Benth. PI. Hartiv. p. 18 ; var. dealbata : pappi paleis 

 pauUo brevioribus et latioribus ; foliis nunc integerrimis oblongis seu lanceolatis, 

 nunc trilobatis lobis integris, nunc praesertim superioribus tripartitis lobis lineari- 

 bus, terminali ssepe 2 - 3-lobato. — B. dealbata, Gray, PL FeiidL p. 99, adtwt. — 

 Calcareous hills of the San Felipe and the Pecos, and valley of the Rio Grande be- 

 low El Paso. — The plant varies greatly in its foliage, and, although more canescent 

 and with a rather shorter pappus, evidently passes into B. absinthifolia, Benth. It 

 is a true congener of B. ambrosioides. 



380. RiDDELLiA ARACHNOiDEA, Gray, PL FendL p. 94, adnot. Psilostrophe 

 gnaphalodes, DC. .' Prodr. 7. p. 261. Hills on the Rio Frio and Rio Grande, 

 Texas ; June, July. — De Candolle's genus Psilostrophe, placed among the " Com- 

 positse incertse sedis," is founded on an imperfect specimen of this plant, gathered 

 by Berlandier at San Luis Potosi. The name has priority over Nuttall's Rid- 

 dellia, and would in strictness supersede it, if, as I suppose, this plant is generically 

 inseparable from Riddellia tagetina, notwithstanding the difference in the pappus. 



381. Amblyolepis setigera, DC. Prodr. 5. p. 668. Prairies from Seguin to the 

 Rio Grande, Texas. (Muskit prairies, twelve miles southwest of New Braunfels, May, 

 Lindheimer, 1850.) — I first received this striking plant from Mr. AVright in the 



discoideis homogamis multi- (plus 20-) floris semipollicaribus subturbinatis ; involucri squamis vix biseria- 

 libus linearibus apice obtuso sphacelatis pubescenti-viscosis ; pappo (conformi ?) e paleis 10 sequilongis 

 oblongo-lanceolatis muticis corolla subdimidio brevioribus ; achenio fere glabro. — " Vera Cruz, Antigua, 

 June, 1838," Linden, in herb. Hook. " Vera Cruz, Mexico, on sand-hills near the sea, 1840," Galeotti, 

 no. 2627. — Root annual. Lower leaves two inches long, including the petiole. 



