76 



PLAXT^ WRIGHTIAN^. 



VI. 



\ 



and fascicled or cro^vded leaves, and small heads; exactly A. liebecladus, DC. 



(1396.) 



A. MULTiFLORUS, Ait^ j. coMMUTATUS, Tovr. Sf Gvai/, l c. Rocky mountain- 



sidcs, at tlic copper mincs, New Mexico; Oct. (1156.) Also, a large form, with 



more paniculate hcads, of unusual size, passing to A. falcatus.* 



A. puNicEUS, Xmw., 7. viMiNEUS, Torr. 8f Grai/, Fl. 2. p. 141. Margin of springs, 

 valley of the Sierra de los Animos, New Mexico; Oct. (1157.) 



A. LONGiFOLius, Lam. ; Torr. ^ Grai/, Fl. 2, p. 139. Low bottom of the Mim- 



brcs, New Mexico ; Nov. 



A. NoYi Belgi, Linn. \ var. foliis mcmbranaceis. — In thickets, on the Mimbres ; 

 Oct. (1758.) — A. Novi Belgi and A. longifolius will absorb scveral nominal 



species. 



A. simplex, Willd. ; Torr. 8f Gray, Fl. 2. p. 131. Banks of the Barbocomori, 

 Sonora; Sept. (1159.) — There is more than one prior name for this species. 



A. spiNOSus, JBentlL PL Ilartw.p. 20. Low grounds, on the Eio Grande, near 

 SanElizario; June. (1397.) 



A. DivARicATus, Nutt. ; Torr. 8^ Gray^ l. c. Banks of the Rio Grande, and of 

 the San Pedro, Sonora. (1160.) 



A. AXGUSTUs, Torr. 8f Grai/, l. c. Tripolium angustum, Lindl. Crinitaria hu- 

 milis, ITook. Fl. Bor.-Am. Aster (Tripolium) frondosus, NMtt. Conyza Altaica, 

 DC. Sand-bars of the Rio Grande, below Dona Ana, NewMexico ; July. . (1161.) 

 The older stems are not strict, but diffusely sprcading, the lateral ones procum- 

 bent. The root is annual or biennial. ^ /^, 



A. PAUCiFLORus, Nutt. Gcn. 2. p. 154: ; Torr. Sf Gray, l. c. A. caricifolius, 



H. B. K. ! Nov. Gen. 4' Sj^ec. 4. p. 92. t. 333. Tripolium caricifolium, Schauer in 

 Llnmea, 19. p. 721. Valley west of the Chiricahui Mountains, in damp, subsaline 

 soil, and near Santa Cruz, Sonora; Sept. (1162.) — Well distinguished by its 

 rigid foliage, and the viscid pubescence or glandulosity of the flowering branchlets, 

 bracts, and pauciserial involucre. The rays when fresh are blue or purple. It is 

 the same as the Mcxican plant of Humboldt and Bonpland above cited, 



A. PAUCiFLORUs, var. caule tenero, foliis angustissime linearibus. — Las Playas 

 Springs, New Mexico, in subsaline soil ; Oct. 



A. (Oxytripolium) Sonor.f: (sp. nov.) : glaberrimus ; radice annua vel bienni ; 

 caule 6 basi ramoso ; ramis patentibus rigidis foliosis ; foliis infimis oblanceolatis 

 inciso-dentatis basi attenuatis, superioribus linearibus rariter spinuloso-denticulatis 

 mucronatis; capitulis solitariis majusculis; involucii hemisphrerici squamis pluri- 

 serialibus gradatim imbricatis lineari-Ianceolatis acutissime acuminatis appressis 

 glabris ; ligulis exsertis ; acheniis sericeo-pubescentibus. — Low valley, in subsaline 

 soil, west of the Chiricahui Mountains, and at San Bernardino, Sonora; Sept. 

 (1163.) — " Stems 10 to 18 inches high, branched from the base ; the branclies 

 rigid. Leavcs about an inch long, thicldsh, veinlcss ; those of the flowering 

 branchlets small and subulate. Iloads about half an inch in diameter, hemisphcri- 

 cal. Scales of the involucre all short, the greenish tlps subulate-pointed. Eays 



A. Fendleri, Gray, Pl, Fcndl p. 66, appcars to be only a 



4 



