88 Dr. Arnott on some new or rare Indian Plants. 



and by the one-celled or at most imperfectly two-celled cap- 

 sule. The Asiatic genus, of which I am about to define se- 

 veral species, may be thus shortly distinguished from the 

 other genera of the Gentianece. 



ExACUMj L. 



Sepale dorso carinato alata. Corolla rotata absque corona, circa 

 capsulam marcescena : sestivatio dextrorsum contorta. Glandula? 

 epipetalae vel hypogynae nullae. Stamina 4 — 5: antherse immutata? 

 porro dehisccntes. Ovarium complete biloculare. Stylus filiformis 

 plus minusve adscendens. Stigma indivismn. Capsula valvulis in- 

 troflexis complete bilocularis, placentis demum utrinque liberis. 



The following is a Clavis Analytica of all the species I have 

 seen : 



Caules subsimplices, corymbi nudiusculi. 



Stamina 4 E. tetragonum, R. 



Stamina 5. 



Folia ovalia acuta vix acuminata, co- "] r j7 , 



ii i ' • r ii L. r «• macranthum. Arn. 



rollae lacunae ovali-oblongye acuta?... J ' 



E. ceylanicum, L. 



Folia lanceolata utrinque attenuata 

 subundulata. corollas laciniae obovales 

 obtusiusculse 



Caules valde ramosi. 



Stamina 5 : inflorescentia foliosa. 



Caules ramique late 4-alati : capsula fflo- 1 7 , 1ir . 7j . . 



i ii- j a ■ r E. Wiqhtianum, Arn. 



boso-etlipsoidea : tlores magni J J * 



Caules ramique 4-goni vix alati : flores parvuli. 



Folia oblongo-lanceolata acuminata : 

 cor. laciniae obovatse ; capsula ovata 



oblonga 



>• E. eourtallense, Arn. 



Folia ovata acuta : cor. laciniae ob- 

 longo-lanceolatae : capsula oblongo- 

 ellipsoidea 



E. Walkeri, Arn. 



Stamina 4: inflorescentia nudiuscula : cap- "1 ^ , , , r 

 , ! , n r >■ E. peaunculatum, L. 

 sula globosa : iiores parvi J l 



These may be more perfectly defined as follows : 



1. E. tetragonum (Roxb.) caulibus subsimplicibus basi 4-alatis 

 sursum 4-angulatis, foliis ovalibus vel oblongo-lanceolatis sessi- 

 libus, corymbo nudiusculo, corollse laciniis 4 oblongis acutis, pe- 

 dunculis fructiferis rectiusculis. 



Hab. ad oras Malabaricas. 

 Flores mediocres. 



2. E. macranthum (Arn.) caulibus subsimplicibus teretiusculis, fo- 

 liis subpetiolatis ovalibus acutis vix acuminatis, corymbo nudi- 



