1£8 SYNGENESIA. JEi^UAriS. 



row and entire. Leaflets of the calix indefinite, disposed 

 in an irregular double or triple series; seed cylindi'ic and 

 attenuated, marked with 10 longitudinal ridges; pappus 

 copious, sessile, pilose, white, only simple to the naked 

 eye, partly plumose, seen througl a lens. 



Species. 1. T. * ^Imicum. Smooth and glaucous; leaves 

 linear-ensiform, flat, entire and naked, shorter than the 1- 

 flowered scape; leaves of the calix imbricated, acuminate, 

 pubescent. Hab. On the grassy plains of Upper Louisia- 

 na, near Fort Mandan; rare. Flowering in July and Au- 

 gust. T.glaiicum. T. N. in Fras. Catal. 1813. Ph. 2. p. 

 5Q5, and 742. 



2. * marginatum. Scape 1-flowered, somewhat pubes- 

 cent; leaves linear-lanceolate, acuminate, margin subun. 

 date, floccosely pubescent; leaves of the calix imbrica- 

 ted, acuminate, smooth. T. ctispidatiim. Fh. 2. p. 742. 

 JIab. On the grr.ssy plains of Upper Louisiana; common. 

 Fl. in April and May. Allied to T. lanattim. of Palestine. 

 Flowers of both species yellow. 



A North American genus with the exception of T. lana- 

 turn. 



t f FxoscuLos^. (Florets all tubular; border 5- 

 cleft.) 



555. STOKESIA. IJHeritier, Sert. Angl. p. 28. 

 Calix foliaccous, subiml^ricate. Corolla ra- 

 diate, florets of the ray funuclforni and irregu- 

 lar. Receptacle naked. Pappus 4 setse. 



Herbaceous and caulescent; leaves lanceolate, pedun- 

 cles solitary, 1-flowered. 



Species. 1. S.cya7iea. Flowers blue. — The only spe- 

 cies of ihe genus, indigenous to South Carolina- 



536. ARCTIUM. L. Lappa. Jussicu. (Burdock.) 

 Calix .e:lol)ose: scales hooked inwards at the 

 V points. Receptacle paleaceous. Pappus setosely- 

 paleaceou.s. 



Leaves large and cordate, unarmed; flowers paniculate, 

 terminal. Receptacle setose; florets purple. 



Species. 1. a. Lappa. Naturdized around settlements 

 as m Europe; introduced. The calix remarkable for its 

 adherence to clothing and to the bides of domestic ani- 

 mals. 



