HelknUlius. syngenesia frustranea. 443 



Stem erect, round, hispid, branchy; the whole plant two 

 or three feet high. Branches below opposite, above often 

 alternate, or two-forked. Leaves short-petioled, opposite or 

 alternate with the branches, in young- luxuriant plants cor- 

 date, in others oblong, or broad-lanceolate, pointed, three- 

 nerved, serrate, scabrous and downy ; size very various. Pe- 

 duncles solitary, leaf-opposed or in the divisions of the 

 branches, round, scabrous, one-flowered. Flowers small, 

 white. Calyx cominou, simple, five-leaved. Hermaphrodite 

 florets from ten to fifteen in the disk ; and five female ones 

 in the ray. Seeds of the ray three-horned, and three-sided ; 

 those of the disk compressed and two-horned. Chaff oi the 

 receptacle linear; apex from three to four-toothed. 



This has a faint, pleasant, aromatic smell. 



6. V. Boswellia. Willd. iii. 2225. 



Annual, cespitose. Leaves alternate, and divided into nu- 

 merous capillary segments. 



A native of Coromandel, where it appears on low sandy 

 moist ground during the dry season. 



Willdenow considers Zinnia hidens (Retz. Obs. vi. 28.)to 

 be this plant. It is very different, and according to my idea, 

 a very perfect Zinnia, w ith a herbaceous, rigidly erect stem, 

 and pinnatifid leaves ; whereas this lies flat on the ground, 

 and leaves bi- and tripinnate. 



SYNGENESIA FRUSTRANEA. 



HELIANTHUS. Schreh. gen. N. 1322. 

 Calyx imbricate, somewhat squarrose. Pappus two-leav- 

 ed. Receptacle chaffy, flat. 



H. annuus. Willd. iii. 2237. 



All the leaves cordate, three-nerved. Peduncles thicken- 

 ing. Flowers drooping. 



3D2 



