106 PLANTtE wrightian^. y, 



than in Gregg's former specimens, on which the species was founded. Eay-achenia 

 with two very small teeth, or sometimes none. 



324. Z. (DiPLOTHRix) ACERosA. Diplothrix acerosa, DC. ! Prodr. 5. p. 611. 

 Hills beyond the Pecos ; Aug. — Stems woody, fastigiately much branched and 

 tufted, a span high, the branches crowded with the setaceous leaves, which are 

 mostly six or eight lines long (in Berlandier's as well as in Wright's specimens). 

 Heads much as in Z. grandiflora, but smaller, and only half, or less than half, 

 their size. Involucre three lines long, narrow, on a peduncle of about the same 

 length ; the scales ciliate. Rays four or five, at first apparently light yellow, be- 

 coming papery and ochroleucous or sulphur-color, as in the two foregoing species. 

 E,ay-achenia often biaristulate ; and sometimes the inner angle is likewise produced 

 into a tooth or short awn. Pappus in the disk-flowers of one, two, or rarely three 

 slender awns, more or less unequal, or in some of the exterior achenia reduced to 

 squamellate teeth. 



325. Z. (Heterogyne) anomala (sp. nov.) : hispidulo-scabra ; caulibus e basi 

 frutescente pluribus adscendentibus spithamseis foliosis apice monocephalis ; foliis 

 anguste linearibus acutis rigidulis trinerviis hispidulo-ciliatis, summis pedunculo lon- 

 gioribus ; floribus foemineis 5 - 6 in ambitu corolla omnino destitutis, sen 1-3 ligula 

 brevissima ovata persistente instructis; acheniis radii et disci ssepissime biaristella- 

 tis. (Tab. X.) — Prairies beyond the Pecos ; Aug. (Also gathered by Berlandier, 

 January, 1828, in Northern Mexico.) — Plant with nearly the foliage and mode 

 of growth of Zinnia grandiflora, Nutt., but with larger heads and inconspicuous li- 

 gules, Avhen these are present at all. Involucre nearly half an inch long, cylindra- 

 ceous-oblong, many-flowered ; the scales rather thin, marked with a greenish line 

 below the sphacelate-scarious margin. The yellow ligules, when present, one or two 

 lines long, usually shorter than the achenium and the style. Eeceptacle, disk- 

 flowers (orange-colored), &c., as in Zinnia; the chaff entire, obtuse. Achenia of 

 the ray triangular-obcompressed, with the margins produced into two paleaceous 

 teeth or subulate short awns ; of the disk compressed, commonly two-awned ; but 

 in some flowers the awns are nearly obsolete ; in others there are three or four 

 (when the achenium is quadrangular-compressed), one from each angle, or rarely 

 five or six. 



J Z. ANOMALA, var. magis hirtella ; floribus radii omnibus ligulatis ; ligulis aut 

 brevissimis ovatis aut anguste oblongis disco tequilongis. — Between Texas and El 

 Paso; coll. of 1851. 



326. Lepachys columnaris, & var, pulcherrima, Torr. 8f Gray, Fl. 2. p. 315. 

 Prairies, Western Texas ; May. 



327. L. COLUMNARIS, var. Tagetes. Rudbeckia Tagetes, James in Long, Exped. 2. 

 p. 68. Obeliscaria Tagetes, DC. Valley of the Rio Grande below El Paso ; Sept. 

 Also in the coll. of 1851. — This is the same as Fendler's No. 424 ; and it was also 

 gathered by Wislizenus between Santa Fe and El Paso. It holds its characters 

 very well, and has not yet occurred with large rays, nor with an elongated disk ; 

 so that it is perhaps a distinct species. 



t L. (Lophocii.ena) peduncularis, Ton: 8f Gray, Fl. 2. p. 315. Near Austin, 

 Texas. 



