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O ww e RED 
BOTANY. 91 
bus et radicalibus interdum 5-sectis vel biternatisectis ; capitulis radiatis ; acheniis fusiformibus 
(extimis tantum tuberculato-rugosis) pappo bicorni brevissimo erecto nunc fere obsoleto coronatis, 
Cosmidium simplicifolium, Gray, Pl. Fendl. p. 86. Gravelly hills, near Sacati ; Bigelow. San 
Pedro River, Sonora; Schott. This has been confused both with T. graciles and T. filifolium, 
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 proposed to retain, 
Совмов BIPINNATUS, Var. PARVIFLORUS, Gray, Pl. Wright. 2, p. 90. From the Cobre, New 
Mexico, to Santa Cruz, Sonora; Bigelow, Wright, Thurber. 
BIDENS BIPINNATA, L. Chihuahua and Sonora; Thurber. Mountains near San Esteban, 
Bigelow. Cobre creek, Wright. The awns are only two, but in all other respects the same as 
B. bipinnata. Wright’s No. 345 has the achenia mostly two-awned. 
BIDENS BIGELOVII (sp. nov.): 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 superan- 
tibus sepiusve nullis; acheniis heteromorphis, exterioribus brevibus lineari-cuneatis truncatis 
papilloso-hispidulis scaberrimis, pappo nunc breviter 2—3-aristatis nunc brevissime bicorni vel 
obsoleto, ceteris angustissime linearibus Jeevibus (semipollicaribus) breviter 2-(raoro 3)-aristatis. 
Banks of the Rio Limpia ; Bigelow. Cibolo valley, Texas, Parry, etc. Mountain arroyo, Rock 
creek and Puerto de Paysanos ; Bigelow, (var. with the awns mostly 3 and longer.) In foliage 
and aspect this plant is somewhat intermediate between B. bipinnata and D. tenuisecta ; in 
fructification it is much more like B. heterosperma, PI. 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, D. 
tenuisecta in Pl. Wright. 1, p. 109. 
BIDENS HETEROSPERMA, Gray, Pl. Wright. 2, p: 90. New Mexico; known val from plants 
raised from seeds gathered by Wright. 
BIDENS FGNICULIFOLIA, DC., var. Gray, Pl. Wright. l. c. Northern Sonora; Wright, 
Thurber. 
BIDENS HETEROPHYLLA, Ort.2; Gray, Pl. Wright. l. c. Between the San Pedro and баша 
Cruz, Sonora; Wright. 
BIDENS CHRYSANTHEMOIDES, Micha. Ojo Caliente, Chihuahua; Thurber. San Felipe; Schott, 
Bigelow. B. helianthoides, H. B. K., is probably the same species. 
HETEROSPERMUM TAGETINUM, Gray, Pl. Fendl. Ё Pl. Wright. l. с. Mountains of the Lim- 
pia and Cobre, New Mexico, Wright, Bigelow. Too near H. pinnatum. 
€—À ÀÓ 
= 
GUARDIOLA PLATYPHYLLA, Gray, Pl. Wright. 2, p. 91. Sonora, between Babocomori and — 
Santa Cruz; Thurber, Wright. Sierra de Pajarito ; Schott. 
 LEPTOSYNE Dovarasit, DC. Prodr. 5, р. 531; Torr. & Gray, Fi. 2, p. 355. Moist and 
