Synopsis of Indian Composite. 303 



39. Siegesbeckia, (Lin. D. C. 5-495). Capitula hetero- 

 gamous, flowers of the ray 1 -series ligulate or deformed; of 

 the disk tubular 3-5-toothed : achaenia obovate oblong, some- 

 what 4-sided, curved within, epappose. Herbaceous dicho- 

 tomous plants, upper parts viscid : involucrum 2-series ; 

 five exterior ones linear spathulate spreading; interior ones 

 involving the achaenia of the ray, viscidly pilose on the back ; 

 receptacle flat : paleae embracing the achaenia : flowers yellow : 



Tribe IV. Senecionide^e. 



Sub-tribe. Melampodine^e. Flowers unisexual, no herma- 

 phrodites ; male and female in different plants (dioicous) 

 or in different capitula of the same plant (heterocephalous), 

 or in the same capitulum (monoicous) : anthers ecaudate ; 

 receptacle usually paleaceous : pappus never setose, 



40. Xanthium, (Tourn. D. C. 5-522). Capitula monoi- 

 cous, male, involucrum subglobose many flowered, scales free 

 1 -series; receptacle cylindrical paleaceous: corolla clavate 

 5-lobed; filaments scarcely adnate to the corolla, anthers 

 free: female, 2-flowers enclosed within a 2-beaked prickly 

 involucrum ; corolla filiform ; stigmas 2-diverging ; achaenia 

 one in each cell of the afterwards indurated involucrum. Her- 

 baceous plants with variously divided leaves : capitula irregu- 

 larly glomerate, spicate, males above, females below. [D. C. 

 well remarks of this " a very abnormal genus among Com- 

 positae, referred by Ventenat to Urticeae, and by Reichenbach 

 to Cucurbitaceae." But for the venation of the corolla of 

 the male flowers I would coincide with the former. The 

 female has no corolla except the beaks, through an aperture 

 of which the stigmas pass.] 



41. Moonia, (Arnott. D. C. 7, p. 288). Capitula monoi- 

 cous ; flowers of the ray 1-series female ligulate 3-cleft; of 



2 R 



