'L 



VI. 



r 

 P 



^ 



PLANT-E WRIGHTIAN^. 



99 



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

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



G. Sprengelii, HooTi. ^ Arn. ; Grai/, Pl Wright p. 124. Hills, near Cookc's 

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

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



G. MiCRocEPHALUM, Nutt. ; Gvay, Tl. Wrightp. 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 breviter decurrentibus 

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

 tulis in corymbum densum polycephalum congestis ; involucri campanulati squamis 



angustata tomentosa exclusa) ovatis obloWisve obtusis glabris candidis. 

 G. polycephalum, Gray, Pl Wright p. 124. n0^9S, non 3Iichj?. — Bed of moun 



tain torrents near Santa Cruz, Sonora; Sept. (1285.) — Stems 

 high, leafy to the top, puberulent-glandularytmder the coat of wool 



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

 about the sarae 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. 

 Tliis is manifestly diiFerent from G. polycephalum, to which I wrongly referrcd the 

 specimcns gathered in 1849. It is more closely related to G, leptopliyllum, \yhich 

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



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

 boso polycephalo ; foliis 3 - 4-pinnatisectis, segmentis linearibus ; petiolo basi vagi- 

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

 eequante. — 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 



iy glabrous, bearing one or two very large leaves (6-12 



S 



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

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

 to bracts. Segments of the leaYCS 6 to 18 lincs long, a line to a line and a half 

 wido, entirc, or with one or two lobes; the rhachis not toothcd. Pedicels pubes- 

 cent. Ileads half an inch long ; the involucre about half that length. Achcnia 

 thick. Corolla apparently iiesh 



Senecio lobatus, Pers. ; Torr. 8r Gray, Fl. 2. p. 437. Banks of the Eio 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. HiUs on the 

 Limpio ; June. (1287.) 



S. riLiFOLius, Niitt /9. Fremonti, Torr. §• Gray, Fl 2. p. 444. Stony prairics of 



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



S. LONGiLOBUS, Beuth., var. floccoso-Ianatus, mox glabresceus. — Yalley of the Kio 

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



S. FASTiGiATUS, Nutt ,' Torr. 8r Grai/, l c. Eavines bctween the copper mines 

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



