V. 



PLANT^ WRIGHTIAN^. 



91 



267. E. DiVERGENs, Torv. ^ Gmy, Fl. 2. p. 175; Hook. in Loml Jour. Bof. 6. 

 p. 242. E. flagellare, Grai/, Pl. Fendl. p. 68. Vallcy of the Llmpia; Aug. Al- 

 so in the coll. of 1851. — Fendlers and Wrighfs specimen, I find, accord Avith 

 NuttalFs, and especially with Geyer's, which has flagelliform branchcs. The root 

 sometimes appears as if perennial. 



268. E. DivERGENS, var. cinereum. E. cinereum, Gray, Pl. Fendl. p. 68. New r 

 Mexico ; the locality not recorded 



269. DiPLOPAPPUs ERicoiDES, /3. hirt^lla, Grai/, Pl. Fendl. p. 69. Valley of 

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



270. PsiLACTis ASTEROiDES, Graij, Pl. Fendl. p. 72. Along the Pecos, Limpia, 

 and Rio Grande, New Mexico ; Aug. — Tlie lower cauline leaves, in spccimcns 

 froni the coU. of 1851, are spatulate and toothed. — This genus should prol^ably 



■ 



be reduced to a section of Machseranthera (Dieteria, Nutt)^ which shows a tendcn- 

 cy to a reduction of the pappus in the ray. 



27h Vide p. 90. 



272. DisTASis MODESTA, JDC / Prodr. 5. p. 279. Diplostelma bellioides, Gray^ 

 PL FendL p. 72. — Hills on the Eio 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 which my Diplostelma was established, much like 

 some of the specimens in Wrighfs 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. 



2T3. Keerlia bellidifolta, Grai/ ^ Engelm. in Proceed. Amer. Acad. 1. p. 47, 

 §• Pl. Lindk. 2. p. 220. Hills of the Rio Frio, Texas ; June ; a very slender form. 



De Candolle characterized his genus Keerlia by its Jiat receptacle and subterete 

 acJienia (in these respects distinguished from the Australian genus Brachycome}, its 

 pluriserial involucre of lanceolate acuminate scales with submembranaccous 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 coroUas 

 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 xanthocomoides, 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 



Nutt. Of the latter, Burke col- 



lected inthe 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 Imear scales of 



the involucre only biserial. /. • i v i * \ 



t GuTiERREZiA (Hemiachyris ; pappo brevissimo pl. m. coroniformi, radii conformi vel obsoeto) 



Alamani: caule spithamjEO e basi suffruticuloso repente parce ramoso, ramis monoccphahs ; fo lus ine- 



aribus vel lanceolatis ; ligulis 12 - 15 involucro late campanulato duplo longionbus ; achenns glabellis ; 



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