492 BOTANICAL GAZETTE [DECEMBER 
glabris aut subciliatis; lateralibus petiolulatis aut subsessilibus, 
lanceolatis aut ovato-lanceolatis, attenuatis, 2-6 cm. longis; 
terminale plus minusve petiolulato, lanceolato-attenuato, apice an- 
guste acuminato, basi subcuneato, 4-6 cm. longa. Petioli 1. 5-4 
cm. longi, glabri, angusti, basi dilatati et connati. Capitula 
plurima, corymbosa aut paniculato-corymbosa, pedicellata, 6-7 
mm. alta, 5-7 mm. lata. Involucrum squamis duplici serie disposi- 
tis; exterioribus linearibus, glabris, squarrosis aut reflexis, 3 mm. 
longis; interioribus lanceolatis, striatis, margine diaphanis, glabris 
aut apice minute pubescentibus, 4-5 mm. Ligulae flavae, striatae, 
8-10 mm. longae. Paleae lineare-lanceolatae, striatae, glabrae aut 
apice subglabrae, 5 mm. longae. Achaenia nigra, biaristata, 
margine tuberculato-hispida, 7-9 mm. longa, aristis squarrosis aut 
recurvis. 
Dr. Edward Palmer 95, in or near Acapulco, Mexico, October 1894 to 
March 1895 (type, with the flowering and the fruiting specimen on two separate 
sheets, in Herb. Univ. Chicago). ey 
An interesting species, allied to B. reptans (L.) G. Don and B. tereticaulis 
DC., but apparently related even more closely to B. Urbanii Greenman. 
Various specimens of this number elsewhere in the United States show a con- 
siderable range of variation in leaf texture and outline; but the flowering /ype 
specimen exhibits leaves strikingly close to those of B. Urbanii Greenman (see 
B. dissecta, below), of which this species may be the Mexican representative. 
Bidens Brittonii, sp. nov.—Herba caule scandente, striato, 
ramis oppositis, 2-4 m. alto. Folia petiolo adjecto 3-9 cm. longa, 
pinnata; foliolis dentatis incisis aut pinnatisectis, supra pubes- 
centibus, subtus tomentosis, o.8-2 cm. longis; petiolis et mediis 
nervis ciliatis. Capitula corymbosa, breviter pedunculata, ligulata. 
Involucrum 4-6 mm. altum, 5-6 mm. latum, squamis inter se sub- 
aequalibus, duplici serie dispositis; exterioribus lineari-spatulatis, 
ciliatis, nonnullis pubescentibus; interioribus linearibus, apice 
pubescentibus et angustioribus, margine diaphanis. Ligulae flavae, 
anguste obovatae, non apice dentatae, 1.5 cm. longae. Paleae 
lineares, apice pubescentes, 6-8 mm. longae. Achaenia linearia, 
striata, biaristata, margine tuberculato-hispida. 
C. Wright 314 pro parte, eastern Cuba, 1856-1857 (type in Gray Herb.). 
The achene characters are drawn from a fruiting specimen (also collected 
by Wricurt, 314) in the Columbia College Herbarium. This specimen, as also 
