COMPOSITA. 901 
141. BIDENS. 
Bidens, Linn. Gen. Plant. n. 932; Benth. et Hook. Gen. Plant. ii. p. 387. 
A large genus of herbaceous plants, represented in nearly all hot and temperate 
regions. Nearly 100 species have been described ; but Bentham and Hooker (loc. cit.) 
estimate that they should be reduced to fewer than fifty. 
_ 1. Bidens alausensis, H. B. K. Nov. Gen. et Sp. iv. p. 235; DC. Prodr. v. p. 602. 
Sour Mexico, Cerro Colorado (Schiede).—Ecuanor. , 
2. Bidens angustissima, H. B. K. Nov. Gen. et Sp. iv. p. 233; DC. Prodr. v. 
p. 601. 
- Nort Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 486) ; 
SoutH Mexico, near Santa Rosa de la Sierra, 7800 feet (Humboldt & Bonpland). Hb. 
Kew. 
3. Bidens anthriscoides, DC. Prodr. v. p. 600. 
Sout Mexico, Cordillera of Guichilaca (Berlandier, 1010, 1052). 
4, Bidens bipinnata, Linn. Sp. Pl. p. 1166; DC. Prodr. v. p. 603. 
Connecticut and Iztiinois southward.—Norra Mexico, Chihuahua and Sonora 
-(Thurber) ; Sourn Mxxico, Guadalupe (Bourgeau, 813),—to Cum and Monts Vipz0, 
and in the West Inprzs; also a common weed in some parts of the Old World, though 
perhaps introduced from America. Hb. Kew. 
5. Bidens brachycarpa, DC. Prodr. v. p. 600. 
- SourH Mxexico, Tampico (Berlandier, 5, 113). 
6. Bidens canescens, Bertol. Fl. Guat. p. 31. 
GuatemaLa, Volcan de Agua (Velasquez). 
7. Bidens caucalidea, DC. Prodr. v. p. 604. 
Norta’ Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 484) ; 
South Mexico, Guanajuato (Hartweg), Toluca (Berlandier, 1138), without locality 
(Graham, Seemann). Hb. Kew. 
8. Bidens chrysanthemoides, Michx. Fl. Bor.-Am. ii. p. 136; Torr. & Gr. Fl. 
N. Am. il. p. 352. 
Common from Canapa throughout the Unrrep Srarss east of the Rocky Mountains, 
and in Arizona-and CaLirornta.—Norta Mexico, Ojo Caliente, Chihuahua (Thurber). 
Hb. Kew. 
9. Bidens costaricensis, Benth. in Vidensk. Meddel. 1852, p. 94. 
Costa Rica, Agucate, San José &c. (Ersted). Hb. Kew. 
10. Bidens daucifolia, DC. Prodr. v. p. 601. 
Souta Mexico, valley of Toluca (Berlandier). . 
BIOL. CENT.-AMER., Bot. Vol. IL., Octoder 1881. 2d 
