Flora of the Malayan Peninsula. 45 



retrorsely barbellate arms.— Distkib. About 120 species, chiefly 

 American. 



BiDENS PiLOSA, Linn. Sp. PL 832. An erect, very variable, glabrous 

 pubescent or pilose herb, 6 to 24 in. high ; stems when dry 4-angled. 

 Leaves 3-fid to 3-partite, or 2-3-pinnatifid, their segments broadly or 

 narrowly ovate to lanceolate, serrate. Heads -3 to -4 in. across, on long 

 stout petioles of varying length, terminal or axillary. Bay-floioers 

 when present white or yellow, often absent. Invohocral bracts shorter 

 than the flowers, broadly oblong, with scarious margins. Cypsela& 

 black, compressed, long, narrow, slender, ribbed; pappus of 3 or 4 

 bristles shorter than the cypselas, pale brown. 



Var. 1 pilosa proper, Hook. fil. Fl. Br. Ind. III. 309 ; leaves 3-fid 

 or 3-sect, their segments broadly or narrowly ovate or lanceolate,, 

 serrate. B. pilosa, Linn. ; DC. Prod. V. 597 ; Clarke Comp. Ind. 140 ; 

 Prain Bengal Plants, 616. B. leucantha, Willd. B. cliinensis, Willd.;. 

 Wall. Cat. 3189 {in part). B. tripartita and B. bipinnata, Wall. Cat, 

 3187 {in part). 



Vab. 2 bipinnata, Hook. fil. I.e. 309 ; leaves bipinnately compound, 

 their segments ovate lanceolate or linear, entire lobed or toothed.. 

 B. bipinnata, Linn. ; Eoxb. Fl. Ind. III. 411. B. cliinensis, Wall. Cat. 

 3189 {in part). B. Wallichii, DC. Prod. V. 598. 



Var. 3 decoynposita. Hook. fil. I.e. 310; leaves decompoundly 

 pinnatifid, segments linear, slender. B. decomposita, Wall, in DC. 

 Prod. V. 602, Cat. 3188; Clarke Comp. Ind. 141 excl. var. fl. 



In all the provinces : in waste ground near cultivation, but not. 

 common. — Distrib. In all warm countries. 



20. Tridax, Linn. 



A perennial herb. Leaves opposite, pinnatisect, with few narrow- 

 segments. Heads solitary on very long peduncles, heterogamous,. 

 rayed. Bay-florets ? , fertile, ligulate or bilabiate, the outer lip large 

 3-fid, the inner small and 2-fid or none. Disk-florets ^ , fertile, tubular, 

 the limb elongate and 5-fid. Livolucral bracts in few series, the outer- 

 short broad herbaceous; receptacle flat or convex; its scales mem- 

 branous. Anthers with short acute auricles at their bases. Style-arms 

 of the ^ flowers hairy above, their apices subulate. Cypselas oblong 

 or depressed-globose, silky; pappus of unequal aristate feathery bristles.- 

 — Distrib. 7 species, tropical American, 1 being an introduced weed- 

 in the tropics of Asia. 



Tridax procumbens, Linn. Sp. PI. 900. Procumbent, hirsute, with 

 slightly branched stems as thick as a crow-quill. Leaves membranous, 

 few, ovate-lanceolate, deeply and irregularly serrate, "5 to 2 in. long.. 



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