SYNGENESIA. TRUSTRANEA. 177 



or entire margin, very obtuse, about 10. — A very distinet 

 genus, but evidently allied to Galanlia. f 



589. HELIANTHUS. L. (Sunflower.) 



Calix imbricated, subsquarrose, foliaceous. 

 Receptacle paleaceous, flat. Fappus paleaceous, 

 2-leaved, caducous. 



Herbaceous, rarely shrubby, often tall; leaves scabrous^ 

 opposite, alternate or rarely verticillate; flowers axillary 

 or terminal, sometimes very large, disk in some species 

 dark brown. — Tube of the discal florets distinct, very 

 short and narrow. 



Species. 1. H. tubceformis. Hab. On the banks of 

 the Missouri, particularly in the vicinity of the aboriginal 

 stations, being often cultivated by them for the seed whicki 

 is dried and ground into meal for food. Nearly allied to 

 H. aiinmis, 



2. atrorubens. Common throughout Upper Louisiana. 

 5. latifloriis. 4. pnbescens. 5. divaricatus. 6. fro7idosus, 

 7. traehelifoUut. 8. longifoUus, Ph. 



9. * paucijiorus. Leaves opposite, linear-lanceolate, acU' 

 minate, serrate, nearly smooth; stem naked, trichotomous, 

 few-flowered; calix closely imbricated; leaflets ovate* 

 Hab. In Lower Louisiana. — Leaves sometimes ternately 

 verticillate, very long, paler beneath and somewhat pu^ 



bescent; ray and disk nearly the same colour, 4 or 5. feet 

 high. 



f Upper leaves alternate. 



10. gig-anteits. /3. -* crinitus. Leaves approximate, and 

 long, linear-lanceolate, acum.inate, nearly entire, subses- 



f To the following very natural group of genera, Helenium^ 

 Leptopo<la, ^ctinella, Galardia, and Baiduina^ I would propose 

 the name of GalardijE; presenting the following general cha- 



racter 



Common calix many-leaved, foliaceous, subequal or imbri 

 cated. Radial florets semitrifid or 3-toothed, neutral or sty- 

 life rous. Discal florets viscidly glandular, 4 and 5-toothed, 

 tube minute. Receptacle hemispherical or globose, naked or 

 more rarely setose, punctate or very deeply favose. Seeds 

 obconic, mostly villous. Pappus paleaceous; leaflets 5 to 10, 

 naked or awned, united at the base. 



Herbaceous, (one species of Actinella shrubby); leaves 

 alternate, entire, rarely all radical; flowers terminal, pe- 

 dunculate. 



