Bidens. SYNGENESIA AEQUALIS, All 
_ A native of Silhet. In the Botanic garden it is in flower 
and seed the whole year. The leaves arg used asa pot-herb 
by the natives of that district. 
BIDENS. Schreb. gen. N. 1267. 
Calyx imbricated, Corol with sometimes a ligulate floret 
or two in the circumference, Seed crowned with straight, 
hispid, barbed awns.« Receptacle chatty. 
1. B. trifida, Buch, 
Annual, erect, smooth, Leaves opposite, three-parted, gross- 
ly serrate, smooth. lowers solitary, peduncled ; the exte- 
rior calyx twice the length of the flowers, its leaflets wedge- 
shaped. Seeds flat, cuneate, smooth, two-horned, 
Found in Nepal by Dr. Buchanan, who sent the seeds to 
the Botanic garden, where the plants blossom during the dry 
season, but perish when the rains begin in June. 
Siem erect, round, smooth, jointed. Branches opposite, 
and like the stem, but much shorter, height of the whole 
plant in the Botanic garden about one foot. Leaves opposite, 
on concave, winged petioles, simple, and three-parted, gross- 
ly serrate, smooth, the simple leaves or segments of the divid- 
ed ones, nearly lanceolate, and obtuse. Flowers peduncled, 
solitary, terminal, erect. Calyx double, the exterior leaflets 
_ five, wedge-shaped, and nearly twice the length of the flower, 
the inner ones oblong, and rather shorter then the corollets. 
Seeds flat, wedge-shaped, smooth, without angles ; horns two, 
rarely three, backwardly hispid, diverging. 
_ Note, In Nepal Dr. Buchanan ar the leaves were often 
eet 
2. B. bipinnaia, Willd. iii, p. 1725. | 
Annual. Leaves bipinnate, gashed and dentate-serrate. 
Flowers terminal, Calyx of from seven to nine simple, cla- 
vate, ciliate leaflets, from two to four neuter ligulate florets 
Zz2 
