128 PLANTS -WRIGHTIAN^. T. 



chartaceo-membranaceous ; the cauline, three to five inches long, and two or more 

 in breadth, reticulated ; the lowest, rather obovate and with a narrowed base ; the 

 principal cauline, either truncate, or usually auriculate, or sagittate-cordate at the 

 closely sessile base ; those of the flowering branches smaller and not auriculate. 

 Heads numerous, in an ample compound corymb, on short pedicels ; the peduncles 

 and pedicels glandular-puberulent, subtended by small subulate bracts, five or 

 six lines long, 8-11- (usually 10-) flowered. Involucre small, not longer than the 

 mature achenia, of 12 to 15 scales; the exterior ones oblong-ovate, the innermost 

 oblong-linear, greenish, not scarious. Corolla pale purple. Achenia 5-ribbed, 

 linear-fusiform, attenuate at the summit and terminated by a somewhat enlarged 

 disk, as in the whole genus. Pappus of rather copious soft and white capillary 

 bristles, which are similar and nearly equal, scabrous, not at all thickened at the 

 apex. — This species is well distinguished by its membranaceous leaves and small 

 heads. 



412. P, Wrightii, var. subpuberula ; foliis rigidiusculis minute glanduloso-sca- 

 brellis. — Hills between the Pecos and the Limpia ; Aug. — " Corolla light purple." 

 This is plainly only a variety of the last, from a dry and exposed locality. It is 

 more allied to Perezia (Acourtia, DC.) microcephala than to any other species; 

 but that species has the scales of the involucre slender and attenuate-acuminate, as 

 in P. hebeclada. 



413. Trixis angustifolia, DC. Prodr. 7. p. 69. Hills near the Limpia; Aug. 

 Dr. Gregg has it from near San Luis Potosi, where it was originally collected by 

 Berlandier. — I should refer this to T. corymbosa, Don, except that the leaves are 

 not petioled. — Berlandier found T. frutescens in Southern Texas, as well as in 

 Mexico. 



414. Leria nutans, DC. Prodr. 7. p. 42; Gray, PI. Lindh. 2. p. 232. Hills 

 near Austin, Texas, and on the San Pedro Piver. Also on the Pio Grande, 

 Texas. 



415. Stephanomeria minor, Nutt. ; Torr. Sp Gray, Fl. 2. p. 472. Valley of the 

 Pecos and of the Limpia ; Aug. — This is the genus Jamesia, Nees in Neu- Wied, 

 Peise (not of Torr. 8f Gray) ; his Jamesia pauciflora being Stephanomeria runci- 

 nata, Nutt. 



foliis radicalibus runcinato-pinnatifidis glabratis ; involucre 12-floro 3 - 4-seriaH, squamis lineari-oblongis, 

 exterioribus gradatim brevioribus ovalibus ; pappo tenui. — Guatemala, S/tinraer (herb. Hook.). Scape 

 about a foot high. Heads five or six lines in length, on subulate-bracteate peduncles. Pappus fuscous, 

 uniserial, rather fine and soft. 



P. (DuMEKiLiA, Less.) HcjMBOLBTii, the Proustia Mexhana, Don, fide Less., I have not seen. Notv^ith- 

 standing its five-flowered heads it would appear to be, as Lessing suggests, a congener of Acourtia for- 

 mosa, Don. The only five-flowered species I have seen is 



P. (Dumekilia) reticulata, the Proustia reticulata, Lag., Don in Trans. Linn. Sac. ; DC. ! Prodr. 7. 

 p. 27. Mexico, Mendez (in herb. DC). Oaxaca, Galeotti, No. 2097. — The leaves are all narrowed at 

 the base, not at all clasping ; the branchlets are puberulent ; the inflorescence is thyrsoid ; the flowers 

 are " light yellow"; the scales of the involucre all oblong and very obtuse. The bristles of the copious 

 pappus are somewhat thickened at the apex. The heads are sometimes only four-flowered, sometimes 

 six-flowered ! 



