1 80 Gentianacecs. \Exacum. 



I. BXACUM, Z. 



Erect annual herbs, stem more or less quadrangular, 1. opp., 

 entire, glabrous, 3- or 5-nerved, fl. in large leafy terminal 

 dichotomous cymes; cal. generally papery, veined, enlarged 

 and persistent with fruit, segm. 4 or 5, usually winged on 

 back; cor. rotate, usually persistent with fruit, lobes 4 or 5, 

 contorted; stam. 4 or 5, inserted in throat of cor., anth. large 

 opening by terminal pores; ov. 2-celled, with numerous ovules 

 in each cell, style long, curved, stigma capitate; capsule septi- 

 cidally 2-valved; seeds minute, numerous, angular. — Sp. 20; 

 16 in Fl. B. Ind. 



Ca!.-segm. with a prominent wing on back. 

 Cor.-lobes 4. 



Cor. I in. diam r. E. axillare. 



Cor. f in. diam 5. E. pedunculatum. 



Cor.- lobes 5. 

 Fl. white, cor.-lobes acute . . . 2. E. Walkeri. 

 Fl. blue. 



Cor.-lobes obtuse or subacute . . 3. E. zevlanicum. 

 Cor.-lobes acuminate, acute . . 4. E. macranthum. 

 Cal.-segm. not winged ; cor.-lobes 4 . . 6. E. sessile. 



1. E. axillare, Thw. Emun. 203 (1861). 

 C. P. 2998. 



Fl. B. Ind. iv. 96. 



Stem i-i^ ft., quadrangular, narrowly winged at angles, 

 glabrous; 1. i|-2| in., oval, much tapering to base and apex, 

 acute, glabrous, 3-nerved, very thin when dried, petiole obscure; 

 fl. numerous, solitary in 1,-axils or from the forks of the 

 branches, on short curved nodding quadrangular ped., cal.- 

 segm. 4, very acute, wings semi-cordate at base, oblique, 

 veined ; cor. about i in. diam., lobes 4, lanceolate, very acute, 

 anth. barely \ in., straight, suddenly narrowed into short blunt 

 beak; capsule \ in., oblong, tipped by long persistent style. 



Moist region below 1000 ft., rare. About Hewesse, Pasdun Korale 

 abundant ; Udugama. Fl. Dec-March ; bright clear violet-blue with a 

 yellow eye. 



Endemic. 



The flowers are occasionally found 5- or even 6-fid (van pentatnera, 

 Clarke). 



2. E. Walkeri, Am. in Nat. Hist. iii. 89 (1839). 

 Thw. Enum. 203. C. P. 1878. 



Fl. B. Ind. iv. 96 (in part). 



Stem l-ii ft., quadrangular, glabrous, slightly branched; 

 1. 1-2 in., ovate or ovate-oval, rounded or subacute at base, 



