1913] SHERFF—BIDENS 491 
aut subacuminata, serrata (aut summum jugum trifoliatum lobis 
serratis), pubescentia, petiolo adjecto 1.5-2.5cm. longa. Petioli 
6-8 mm. longi, ciliati, pilosiusculi. Capitula terminalia, longe 
pedunculata, 3 cm. lata. Involucrum basi hispidulum, squamis 
duplici serie dispositis; exterioribus linearibus, glabris; interioribus 
longioribus, lanceolatis, margine diaphanis. Ligulae flavidae (in 
specim. exsicc.), striatae, 1.2 cm. longae. Achaenia matura 
absentia. Ovaria biaristata, aristis retrorsum hamosis. 
Heyde and Lux 6163, Guatemala, 1894 (type in Herb. Univ. Chicago); 
eidem 6162, Fraijanes, Depart. Amatitlan, Guatemala, alt. 900 m., September 
1893. 
Bidens ramosissima, sp. nov.—Herba annua, pallida, ramosis- 
sima, 3-5 dm. alta; ramis tenuibus, oppositis, sulcatis, subglabris 
aut hispidis; ramulis monocephalicis. Folia petiolo adjecto 
8-15 mm. longa, tri-(aut pinnati-)partita; foliolis integris aut 
trilobatis, 1-7 mm. longis, acutis, base angustis aut cuneatis; peti- 
olis 2-4 mm. longis, ciliatis et nonnullis hispidis. Capitula termi- 
nalia, subcorymbosa, longe et tenuiter pedunculata, ligulata, 1-2 
cm. lata. Involucrum basi hispidum, demum reflexum, squamis 
duplici serie dispositis; exterioribus linearibus, ciliatis, apice plus 
minusve dilatatis, mucronatis, 3mm. longis; interioribus sub- 
glabris, lanceolatis, margine diaphanis, 4~5 mm. longis. Ligulae 
albae aut apice subviolaceae, obovatae, striatae, truncato apice 
3-5 dentato dentibus obtusissimis, 6-8 mm. longae. Paleae 
lineares, 4mm. longae. Achaenia linearia, sulcata, biaristata, 
margine et lineis mediis scabrido-hispida, 8-10 mm. longa; aristis 
retrorsum hamosis. 
W. E. Safford 1391, near Guadalajara, Jalisco, Mexico, February 23, 
1907 (type in U.S. Nat. Herb.). 
A species suggestive of B. Deamii, but differing in the finally reflexed 
involucres and the more slender, highly subdivided branches. It is one of the 
several species of Bidens that approach too closely, in color of rays or beaked 
achenes, the genus Cosmos. However, distinctly rostrate achenes are absent 
in the type, and the involucre, furthermore, is that of a true Bidens. On label 
said to have the common name “accitillo.” 
Bidens mexicana, sp. nov.—Herba caule scandente, —? 
tereti, striato, glabro. Folia opposita, petiolata, pinnati-(aut 
bipinnati-)divisa; foliolis aut laciniis submembranacels, serratis, 
