V. PLANTS WRIGHTIAN^. 91 



267. E. DiVERGENS, Torv. Sf Gray, Fl. 2. p. 175 ; Hook, in Lond. Jour. Bot. 6. 

 p. 242. E. flagellare, Gray, PL Fendl. p. 68. Valley of the Limpia ; Aug. Al- 

 so in the coll. of 1851. — Fendler's and Wright's specimen, I find, accord with 

 Nuttall's, and especially with Geyer's, which has flagelliform branches. The root 

 sometimes appears as if perennial. 



268. E. DIVERGENS, var. cinereum. E. cinereum, Gray, PI. Fendl. p. 68. New 

 Mexico ; the locality not recorded. 



269. DiPLOPAPPUs ERicoiDES, /8. hirtella. Gray, PI. Fendl. p. 69. Valley of 

 the Pecos and of the Limpia; Aug. -Oct.* 



270. PsiLACTis ASTEROiDES, Gray, PI. Fendl. p. 72. Along the Pecos, Limpia, 

 and Kio Grande, New Mexico ; Aug. — The lower cauline leaves, in specimens 

 from the coll. of 1851, are spatulate and toothed. — This genus should probably 

 be reduced to a section of Machaeranthera (Dieteria, Nutt), which shows a tenden- 

 cy to a reduction of the pappus in the ray. 



271. Vide p. 90. 



272. DisTAsis. MODESTA, DC. Prodr. 5. p. 279. Diplostelma bellioides, Gray, 

 PL Fendl. p. 72. — Hills on the Rio Frio and Turkey Creek, Western Texas; June. 



— Berlandier's plant, on which Distasis was founded, proves on inspection to be a 

 slender state of the plant on Avhich my Diplostelma was established, much like 

 some of the specimens in Wright's collection. The outer, paleaceous pappus is 

 larger, however, in all my specimens. The heads vary considerably in size and in 

 the number of the flowers. The anthers are not caudate. In some dried specimens 

 the rays are violet-purple. 



273. Keerlia bellidifolia, Gray 8f Engelm. in Proceed. Amer. Acad. 1. p>' 47, 

 8p PL Lindh. 2. p. 220. Hills of the Rio Frio, Texas ; June ; a very slender form. 



— Pe Candolle characterized his genus Keerlia by its flat receptacle and subterete 

 achenia (in these respects distinguished from the Australian genus Brachycome), its 

 pluriserial involucre of lanceolate acuminate scales with submembranaceous mar- 

 gins, and its pappus of very short paleae more or less united in a minute crown. The 

 first of the three species differs from the others, as well as from the subtribe the ge- 

 nus is placed in, by its yellow rays : the achenia likewise are not striate, the corollas 

 have a slender tube, and the scales of the involucre are coriaceous. The plant, 

 moreover, has so entirely the aspect and the involucre of Xanthocoma, that De Can- 

 dolle was probably thence led to adduce the Brachycome xanthocoraoides, Less., as 

 a synonym. In fact, the K. linearifolia would be a true Xanthocoma, were it not for 

 a minute paleaceo-coroniform pappus and the lanceolate-linear appendages to the 

 style, which refer it rather to Gutierrezia § Hemiachyris.-f It is not the same as 



* Arctbgeron, DC. is congeneric with this and Diplopappus alpinus, Nutt. Of the latter, Burke col- 

 lected in the Rocky Mountains a taller and more developed, probably less alpine state, if not a new spe- 

 cies ; with stems six inches high, and linear leaves six to ten lines long, and the narrowly linear scales of 

 the involucre only biserial. 



t Gutierrezia (Hemiachyris ; pappo brevissimo pi. m. coroniformi, radii conformi vel obsoleto) 

 Alamani : caule spithamseo e basi suifruticuloso repente parce ramoso, ramis monocephaiis ; foliis line- 

 aribus vel lanceolatis ; ligulis 12 - 15 involucre late campanulato duplo longioribus ; acheniis glabellis ; 



