362 



brous, bitter, not milky : leaves opposite, rarely alternate, sim- 

 ple, 3-5-ribbed, entire or S-lobed : petioles often confluent at 

 the base : flowers terminal, or axillary, regular or rarely ir- 

 regular. 



GENUS I. EXACUM. 



Teii-nsatlfla j^oiaosyiiia. Sex .- Syst s 



Deriv. From Ex, out of, and j4ffo, to drive ; it is said to pos- 

 sess the 25roperty of expelling poison. 



Gen. Chab. Calyx 4-5-parted, segments keeled or winged at 

 the back : corolla rotate, withering, tube afterwards globose, 

 limb 4-5-parted : stamens 4-5, inserted on the thi'oat of the 

 corolla, suberect : anthers dehiscing ai the apex by the poriform 

 opening of a cleft : ovary 2-ceUed with introflexed valves, ovules 

 attached to either side of the central suture : style distinct, decli- 

 nate, deciduous, stigma undivided, capitulate or lightly ti'ans- 

 versely fui-rowed . capsule 2-ceUed, 2-valved,. septicidal, placentae 

 central, sometimes separating, sometimes jointed into one, after- 

 wards free from the valves : seeds very minute, immersed in the 

 placenta. — Herbs usually annual, straight, quite glabrous : cymes 

 terminal. 



(1) E. TETRAGONUM. (Uoxh.) 



Ident. Roxb. flor. Ind. I. p. 398. — Dec. prod. IX. p. 44. 



■ Syn. E. Hamiltonii, Don. 



Engrav. Wall. Ic. III. t. 274. 



Spec. Char. Stem 4-cornered, somewhat simple: leaves stem- 

 clasping, ovate-oblong, acuminate, 5-neived, smooth at the mar- 

 gin : segments of the calyx ovate-acute : lobes of the corolla el- 

 liptic, twice as long as the tube : flowers large, blue with gold 

 cuioured anthers. ^ 



■ Eengal, flowering in the rainy season. , 



(2) E. TERES. (Wall.) 



Ident. Eoxb. flor. Ind. (Ed. Wall.) I. p. 414.— Dec. prod. IX. 

 p. 44. 



Spec. Char. Stem terete : leaves very short, stem-clasping, 

 attenuated at the base, linear-lanceolate, long-acuminated, 3-nerved : 

 segments ol' the 4-parted winged calyx ovate, acute : lobes of the 

 corolla obovate-elliptic, apiculate : flowers blue. 



Silhet, flowering in Ftbiuuiy and March, 



