Lipotriche.] COMPOSIT ( Harv.) 133 
XLII. BIDENS, L. 
Heads many-fl., either homogamous and discoid, or more frequently 
radiate, the ray-ft. ligulate, neuter, the disc-l. perfect, 5-toothed. Inv. 
scales in a double row, similar or dissimilar. Recept. flattish, bearing 
pales. Style branches tipped with a short cone. Achenes more or less 
compressed, aculeate, tapering into a beak, tipped with 2-5 rigid, re- 
trorsely hispid, scabrous bristles. DC. Prodr. 5, p. 594. 
A large and widely-dispersed genus, most numerous in America. Stems herba- 
ceous, square or round, mostly with opposite branches. Leaves opposite, either un- 
divided, cut or pinnate-partite ; lobes cut or serrate. Flowers mostly yellow, rarely 
with white rays.—Name, bidens, 2-toothed, in allusion to the bristles of the pappus. 
1. B. pilosa (Linn. Sp. 1166); stem erect, 4-angled, striate, glabrous 
or pilose; leaves pinnati-partite, the uppermost trifid or tripartite, their 
lobes ovate, acute or acuminate, sharply serrate, glabrous or pubescent, 
equal at base or the lateral oblique ; heads subcorymbose, long-pedun- 
cled, either discoid or with white rays ; achenes linear-angular, glabrous 
or pubescent, with 2-4 bristles, unequal. DC. 1. c. p. 597. 
Var. 8, leucantha; heads radiate, the ray white, B. leucantha, Willd. DC. l. c. 
598. B. Wallichii, DC. B. Sundaica, Bl. DC. Ul. c. 
Has. Eastern Districts and Port Natal: also in waste ground. (Herb, D.,Sd., Hk.) 
A common tropical and sub-tropical weed. Pubescence variable. 
XLII. LIPOTRICHE, R. Br. 
Heads many-fl., radiate; ray-fl. in « row, female, broadly ligulate, 3- 
toothed, externally pubescent; disc-/l. hermaphrodite, tubular, 5-toothed. 
Inv, 2-3-seriate, loosely imbricate; the scales lanceolate, leafy. Recept. 
convex, covered with flattish, acuminate leafy pales. Style branches of 
the disc-fl. tipped with a hispid cone. <Anthers nigrescent. Achenes tur- 
binate-prismatic, 3—4-angled, those of the disc subcompressed. Pappus 
of 8-10, short, rigid, unequal, deciduous, rough bristles. DC. Prodr. 5, 
Pp. 544. Also Psathurocheta, DC. 1. c. p. 609. 
A coarse-growing, scabrous herb, with the aspect of Wedelia. Leaves opposite, 
long-petioled, the lower 3-lobed, the upper hastate-1 late, 3-nerved, serrate. 
Pedunce. long, 1-headed, solitary or subcorymbose. FI. bright yellow. Name from 
Aeurw, to cast away, and Opit, a bristle ; because the pappus is deciduous. 
1. L. Brownii (DC. 1. c. 544); Sch. B.in Walp. Rep. 6, p. 157. Psa- 
thurocheta Drege, DC. l.c.609. Trigonotheca Natalensis, Sch, B. MSS. 
Zey. 1 1042. 
Has. On the Congo, Chr. Smith; Natal, Drege! Krauss, 31; Gerr. § WK. 298. 
Crocodyle R., Burke/ Kreili’s Country, H. Bowker ! 385. (Herb. D., Hk., Sd.) 
Stem 2-3 feet high, 4-angled, appressedly strigose. Leaves on long petioles, the 
lower 5-6 inches long, 3 inches wide at base, 3-lobed, the terminal lobe very long, 
trowel-shaped, the lateral short, all sharply serrate ; upper leaves simple, all very 
scabrous. Pedune. 4-6 inches long. Ray-fl. rich, crocus-yellow. 
XLIV. SPILANTHES, Jacq. 
Heads many-fl., either heterogamous, with ray-fl. female, ligulate, 
often short, ina single row; or homogamous, all the fl. perfect and 
tubular, 4-5-toothed. Jnv. scales in 2 rows, appressed, shorter than 
