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BOI^ANY. 



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bus et radicalibus intcrdum 5-sectis vel Liternatisectis ; capitulis radiatis ; acheniis fiisiformibus 

 (extirais tantiim tuberculato-rugosis) pappo bicorni brevissimo erccto nunc fere obsolete coronatis. 

 Cosmidium simpllcifolium, Gray^ PL FendL p. 8G. Gravelly hills, near Sacati ; Bigclow. San 

 Pedro River^ Sonora ; ScJiotL This has been confused both with T. graciles and T. filifoHum^ 

 and specimens in Wright's collection have perhaps been distributed as a form of the latter. Its 

 rigid stems and foliage accord with the former^ though the leaves are commonly less divided ; 

 but the rays distinguish it from that species, while the pappus (reduced to two exceedingly 

 short or obsolete teeth, which are strictly erect, and slightly hairy, but not barbed) distinguishes 

 it from both species. A nearly or quite simple leaved state of this species is my Cosmidium 

 simplicifolium, which name, a little altered to bring it nearer the fact, it is 2}roposed to retain. 



Cosmos BiriNNATus^ var. parviflorus, Grai/j PL Wright. 2, p. 90. From the Cobre, New 

 Mexico, to Santa Cruz, Sonora ; BigeloWy Wright^ Thurher, 



BiDENs "DiriNNATA, L. Chihuahua and Sonora; Thurher. Mountains near San Esteban, 

 Bigelow. Cobre creek, Wright. Tlie awns are only two, but in all other respects the same as 

 B. bipinnata. Wright's No. ?A5 has the achenia mostly two-awned, 



BiDENs BiGELovii (sp. uov.) : annua, fere glabra; caule ramoso gracile suberecto ; foliis 

 trisectis, segmentis 3-5-partitis, lobis oblongis cuneatisve paucius pinnatifido-incisis ; capitulis 

 subsolitariis longe pedunculatis ; involucro glabriusculo ; ligulis albidis ? discum baud siiperan- 

 tibus stepiusve nullis ; acheniis heteromorphis, exterioribus brevibus lineari-cuneatis truncatis 

 papilloso-hispidulis scaberrimis, pappo nunc breviter 2-3-aristati8 nunc brevissime bicorni vel 

 obsoletOj ceteris angustissime linearibus la^vibus (seraipoUicaribus) breviter 2-(raoro 3)-aristatis. 

 Banks of the Rio Limpia ; Bigelow. Cibolo valley^ Texas, Parry ^ etc. Mountain arroyo, Rock 

 creek and Puerto de Paysanos ; Bigeloiv^ (var. with the awns mostly 3 and longer.) In foliage 

 and aspect this plant is somewhat intermediate between B. bipinnata and B. tenuisecta ; in 

 fructification it is much more like B. heterosperma, PL Wright ^ but the heads are twice or thrice 

 the size. The outer achenia are truncate and rough in all the specimens. Awns of the disk- 

 achenia 1 to 1^ line long. To this belongs No. 346 of Wright's first collection referred to, B. 

 tenuisecta in PL Wright. 1, j). 109. 



BiDENS HETEROSPERMA, Gray^ PL Wright. 2j p. 90. New Mexico; known only from plants 

 raised from seeds gathered by Wright. 



BiDENS rcENicuLiFOLiA, DC.^ var. Gray^ PL Wright. L c. Northern Sonora; Wright y 



Thurher. 



BiDENS BETEROPHYLLA, Ort.f ; Gray ^ PL Wright. L c. Between the San Pedro and Santa 

 Cruz, Sonora; Wright. 



BiDENS CHRYSANTHEMOiDES, Miclix. Ojo Calicute, Chihuahua; Thurher. San Felipe; Scliott^ 

 Bigelow. B. helianthoides, H. B. K.y is probably the same species. 



Heterospermum tagetinum, Gray, PL FendL dt PL Wright. L c. Mountains of the Lim- 

 pia and Cobre, New Mexico, Wright, Bigelow. Too near H. pinnatum. 



GuARDioLA PLATYPHYLLA, Gray, PL Wright. 2, p. 91. Sonora, between Babocomori and 

 Santa Cruz ; Thurher, Wright. Sierra de Pajarito ; Schott. 



YNE DouGLAsrr, BG 



d Grav. FL 2, p. 355. Moist 



