PENTANDRIA. DIGYNIA. 171 



point, and emarglnate behind; saccviliim empty; tube 

 i-evei-sed, (compared with Asciepias, Sec ) appearini^ Ukc a 

 slender ])entag-onal column, supporting the external parts 

 of fructification, its summit 5-toothed. Antheridium very- 

 short, wings cnistaceous; cusps of the lobes inflected. 

 Polliiiia even, 5 pair; lobes nearly sessile, short, compress- 

 ed, and clavate. 

 Hab. From Carolina to Florida, in dry and sandy soil. 



246. AMSONIA. Walter, 



Calix 5-parted. ra?-o:/a funnel form, orifjcc 

 closed. FGlilcles 2, ^lect Seed terete, naked, 

 and obliquely truncated. (^Stigma annulate.) 



Leaves alternate; fiowers in fustigate or corymbose pa- 

 nicles, mostly blue. 



Species. 1. A. IcJifolla. 2. aalicifolla. o. migustlfjUa. 

 A Noith American genus. 



2A7, GELSEMIUM. Jimie^i. (Carolina Jcssa- 

 mine.) 



Calix 5-Ieaved, very small. Corolla Ainnel- 

 form, border spreading, 5-Iobed, nearly equal. 

 Capsule compressed and flat, bipartile, biiocu- 

 lar. Seeds flat, attached to the margins of t!ie. 

 valves. 



A twining evergreen shrub, not lactescent, leaves oppo- 

 site; flov.'ers in small axillary and terminal fascicles, yel- 

 low; calix subtended by imbricated gemmaceous bractes- 



Species. 1. G. nitidum. Flowers fragrant. Anthers 

 oblong-sagittate; style short, bifid; stigmas linear-oblong, 

 bilobed, pubescent. /3. *inodoriim. Calix leaves obtuse; 

 fiowers inodorous. Neur Savannah in Georgia. 



A North American genus. 



C48. GENTIANA. Z. (Gentian.) 



Calix half 5-cleft, or half 5-parted. Corolla 

 tnbulous at the base, campanulate, border 4 or 

 5-cleft; divisions ciliate or entire, spreadijig, 

 erect or connivent, sometimes furnished with 

 intermediate plaits. Stamina 4 or 5, distinct or 

 connate. Capsule 2-valved, l-celledj receptacles 

 2, longitudinal. 



