■VI. PLANTS ■\trightianj:. 99 



G. LUTEO-ALBUM, Linn. Sandy bars of the Nueces, Texas ; also on the Pecos, 

 and the Rio Grande, near El Paso. (1281.) 



G. Sprengelii, Hook. Sf Am. ; Gray, PL Wright p. 124. Hills, near Cooke's 

 Spring, between the Rio Grande and the Mimbres ; Nov. (1282.) — Also (a large 

 form) on hills around the copper muies (1283), and in valleys of Sonora (1284). 



G. MicRocEPHALUM, Nutt. ; Gray, PI. Wright, i^. 124. Mountains near the cop- 

 per mines : a single specimen only gathered. 



G. LEUCOCEPHALUM (sp. nov.) : caulibus e basi herbacea plurimis erectis simplici- 

 bus cano-lanatis ; foliis anguste linearibus acutissimis basi brevitcr decurrentibus 

 supra viridibus pube brevissima subglandulosa scabridis subtus cano-lanatis ; capi- 

 tulis in corymbum densum polycephalum congestis ; involucri campanulati squamis 

 (basi angustata tomentosa exclusa) ovatis oblongisve obtusis glabris candidis. — 

 G. polycephalum, Grai/, PL Wright, p. 124. «o. 893, non Michx. — Bed of moun- 

 tain torrents near Santa Cruz, Sonora; Sept. (1285.) — Stems one or two feet 

 high, leafy to the top, puberulent-glandular under the coat of wool, termijiated by a 

 dense compound corymb. Leaves 2 or 3 inches long, only a line and a half wide, 

 about the same breadth at the manifestly decurrent base. Heads more than 50- 

 flowered, the hermaphrodite flowers few in the centre. Involucre 3 lines in length 

 and breadth ; the scales bright white, all (except perhaps the outermost) obtuse. — 

 This is manifestly different from G. polycephalum, to which I wrongly referred the 

 specimens gathered in 1849. It is more closely related to G. leptophyllum, which 

 has straw-colored or fuscous and lanceolate scales of the involucre. 



Cacalia decomposita (sp. nov.) : glabrata; caule longe subaphyllo apice corym- 

 bose polycephalo ; foliis 3 - 4-pinnatisectis, segmentis linearibus ; petiole basi vagi- 

 nante ; involucro 5 - 6-phyllo 5 - 6-floro basi vix bracteolato ; pappo corollam sub- 

 sequante. — Mountains, east of Santa Cruz, Sonora; Sept. (1286.) — Stem 3 feet 

 high, terete, floccose-woolly at the base and at the base of the petioles, otherwise 

 nearly glabrous, bearing one or two very large leaves (6-12 inches long and little 

 less broad) at the base, naked above, or with one or two small but similarly dis- 

 sected leaves, those which subtend the branches of the compound corymb reduced 

 to bracts. Segments of the leaves 6 to 18 lines long, a line to a line and a half 

 wide, entire, or with one or two lobes ; the rhachis not toothed. Pedicels pubes- 

 cent. Heads half an inch long ; the involucre about half that length. Achenia 

 thick. Corolla apparently flesh-color. 



Senecio lobatus, Pers. ; Torr. <§' Gray, Fl. 2. p. 437. Banks of the Rio Grande, 

 near El Paso ; and banks of the Rio Santa Maria, Chihuahua ; April, May. (1413.) 



S. Tampicanus, DC. Prodr. Q. p. 427; Gray, PL Wright, p. 125. Hills on the 

 Limpio ; June. (1287.) 



S. riLiFOLius, Nutt. yS. Fremonti, Torr. Sf Gray, FL 2. p. 444. Stony prairies of 

 the Leona and Nueces, Texas ; May. (1288.) 



S. LONGiLOBUs, BentL, var. floccoso-lanatus, mox glabrescens. — Valley of the Rio 

 Grande, near El Paso ; April. (1414.) — Between No. 399 and No. 400. 



S. FASTiGiATUs, Niitt. ; Torr. 8f Gray, L c. Ravines between the copper mines 

 and the Mimbres, New Mexico; Oct. (1289.) — A low form, exactly agreeing 



