Synopsis of Indian Composites. 305 



44. Guizotia, (Cass. D. C. 5-551). Capitula heteroga- 

 mous, ray ligulate female ; disk hermaphr. tubular 5-toothed, 

 base of the tube of the corolla furnished with a ring of thick 

 jointed hairs : achaenia smooth. Herbaceous: flowers large, 

 terminal, pedicelled : involucrum 2-series, foliaceous : recep- 

 tacle paleaceous : flowers yellow. [The only species G. oleifera 

 (Wight's Illust. tab. 132,) is much cultivated in Mysore as 

 an oil plant. It is a widely distributed plant. 



45. Bidens, (Lin. D. C. 5593), Capitula either homoga- 

 mous discoid, or radiate with the flowers of the ray ligulate 

 neuter : achaenia more or less obcompressed, surmounted by an 

 aculeate beak, ending in 2-5-rigid, retrorsely hispid, bristles. 

 Herbaceous annuals with opposite often divided leaves \ involu- 

 crum 2-series, scales of each either similar or dissimilar : 

 receptacle flat, paleaceous: flowers usually yellow in one, 

 purple. 



46. Spilanthes, (Jacq. D. C. 5-620). Capitula some- 

 times heterogamous, with the flowers of the ray ligulate 

 female, sometimes homogamous, all the flowers hermaphrodite 

 tubular 4-5-toothed : branches of the style of the hermaphro- 

 dite flowers truncated penicilate : achaenia of the disk com- 

 pressed, often ciliate on the edges. Herbaceous annuals : 

 leaves opposite : peduncles 1 -cephalous : capitula ovate or 

 conical : involucrum adpressed 2-series, shorter than the disk, 

 exterior ones foliaceous : flowers yellow. Plants usually 

 pungent sialagoges. 



47. Ximensia, (Cav. D. C. 527). Capitula many flowered 

 heterogmous, flowers of the ray female ligulate, 1 -series ; 

 of the disk hermaphrodite tubular 5-toothed : tube of the 

 corolla hispid : branches of the disk styles appendiculate at 

 the apex : achaenia compressed, winged, deeply emarginatc, 

 subpilose, biaristate 5 aristae cohering with the sides of the 



