ME. C. B. CLABKE ON INDIAN SPECIES OF CYPEBUS. 3l 



stout, with quadrangular excavations (altogether of Juncellus), 

 without the vestige of a wing. In G. dives (fig. 13) the rhachilla 

 is narrow, with very narrow, almost soluble, yellow wings, as in 

 G. exaltatus (and its varieties). 



In G. alopecuroides the packing of the flat-backed glumes is 

 very similar to that in G. Monti : in G. dives the boat-shaped 

 glumes are as in C. exaltatus, differing somewhat in colour. I 

 esteem G. alopecuroides, Rottb., as very distinct from 0. dives. 



C. alopecuroides, Boeck., is mainly founded on C. amoenus, 

 Koenig et Roxb. MS. Roxburgh subsequently assumed this to be 

 G. alopecuroides, Rottb., despite the difference in style and nuts ; 

 he therefore dropped the name G. amcenus altogether, and pub- 

 lished it as C. alopecuroides, Rottb. This is really very near C. 

 exaltatus, Retz. ; the true G. alopecuroides, Rottb., Roxburgh 

 never saw. 



Parag. 4. On C. inundatus and C. procerus. 



The most critical of all species is G. inundatus, Roxb., a species 

 with bifid style, which so closely resembles G. procerus, Rottb. 

 (with trifid style), that the two have been mixed together by 

 Wallich, nor are they easily separable except by the style and 

 nut, the bifid style having a nut compressed contrary to the rha- 

 chilla, the trifid style having a distinctly trigonous nut : these 

 two kinds of nut do not occur on one plant. I for some time 

 considered that this was an exceptional Gyperus, in which the style 

 was 2-fid or 3-fid in the same species ; but I am satisfied, from 

 the full series of specimens in the Calcutta Herbarium, that they 

 are two well distinct species. 



I observed first that the compressed nut of G. inundatus is very 

 much wider than the trigonous nut of G. procerus, and has a very 

 different base. In the species of Gyperus, however, with an 

 unequally trigonous nut there is no tendency in the nut to get 

 wider as it gets less trigonous. Moreover the base of the nut 

 of G. inundatus has a different shape and structure from the nut 

 of G. procerus. Secondly, the rhachilla in G. inundatus is thick, 

 with quadrate excavations and central striae exactly as in G. 

 Monti ; and the nut is so like that of G. Monti, that the species 

 are not easily separated but by the inflorescence. In G. procerus 

 the rhachilla is much slenderer, with oblong excavations, nar- 

 rowly distinctly hyaline-winged. The glumes of C. inundatus 

 are very dull-coloured, flat on the back, strongly striated, the 



