SUBSUBAREAS OF BRITISH INDIA. 143 
The Distribution of the Indian Cyperacex compared with 
that of the Cariciner. 
ScLErIA.— In this genus, of the 29 species in India, 11 occur 
in only one of the regions discussed under Carieinex, and. there- 
fore prove little. Two or three are rice-field weeds—hemispherie 
or cosmopolitan in area. But there are no less than 11 species of 
our Eastern Region which extend also to our Nilghiri-Ceylon 
Region ; several of these are South Malay, not extending north 
to Khasia, and therefore support the theory that the Nilghiri- 
Ceylon component of the Indian Flora was derived from the 
same source as the Eastern, but did not come to Ceylon from 
Khasia, vid Chota Nagpore. Specially to be noted in this argu- 
ment are Scleria zeylanica, which extends from Borneo to Pegu, 
but not farther north ; Sel. chinensis, Kunth, which is found in 
Ceylon, Singapore, Malaya; Sel. Nees, Kunth, found in Ceylon 
and Malaya. 
The Suborder Mapaniex, en masse, belong to the Eastern 
component of the Indian flora; they lie in the Malay Peninsula, 
one species, Hypolytrum latifolium, L. C. Rich., extending to 
Khasia and Sikkim, with an important parallel group in the 
Nilghiri-Ceylon Region. The closely-allied species occur either 
in the Malay Peninsula (a few in Pegu) or in Ceylon. The 
strongly-marked Lepironia occurs in Ceylon and in the extreme 
south of the Malay Peninsula (also in Mascarenia, Australia). 
Remrrea is confined to South India, but itis a sea-shore plant, 
and its distribution proves little beyond this. 
Gaunta is specially an Australian genus, two species of which 
extend to the South Malay Peninsula. 
CLADIUM is specially Australian, Cladium Maingayi and 
C. glomeratum reach the South Malay Peninsula. ©. undu- 
latum, Thwaites, is confined to Ceylon and Malaya. ©. riparium 
yar. crassa is only known from the sea-coast of Bengal and 
Ceylon; the abundant growth of this at 5000 feet elevation at 
Shillong may possibly yet be that of an introduced plant. 
Ryncuospora.—R. glauca, Vahl, and its var. Griffithii occur 
in our Eastern Region, also in Nilghiri-Ceylon. R. gracillima, 
C. B. Clarke, oceurs in our Eastern Region, also in the Nilghiri- 
Ceylon Region (also in the Nicobars). The remaining species 
occur either in our Eastern Region or in the Nilghiri-Ceylon 
Region. 
