438 
A CENSUS OF THE INDIAN POLYGONUMS. 
This sub-sub-area, so far as the genus Polygonum is concerned, is 
an extra-Indian extension of Boissier’s oriental province. All except 
four of the species belong to either Persicaria or Avicularia, The 
species of the former section have a wide Indian and extra-Indian 
distribution both eastwards and westwards. The Avicularia section, 
however, is especially characteristic of this sub-sub-area, in which and 
in the. drier districts of the North-West Himalaya the Indian contin- 
gent of Boissier^s oriental Polygonums reach their eastermost limit, 
with the exception of the polymorphous Polygonum plebejuMt and 
Polygonum aviculare ; the former is found all over India, China and 
Australia, the latter reaches China. 
II.— Central Provinces. 
Species endemic to the sub-sub-area No species. 
Species distributed to other sub-sub- 
areas No spee’es. 
Section III, — Avicularia. 
' (i6) Polygonum plebejum R. Br. 
Section IV. — Amhlygonon, 
Species with an extra-Indian distri- (i8) Polygonum tomentosum 
bution • . • . • 5"^ (19) Polygonum limbatum Meisn, 
Section VII. — Persicaria.' 
(30) Polygonum glabrum Willd. 
.. (39) Polygonum barbatum Linn. ^ 
Total of Central Provinces species : 5, or 6’33 per cent. 
The true percentage is probably considerably higher than 6*33, 
but the Central Provinces are very poorly represented, so far as the 
genus under consideration is concerned, in the Calcutta Herbarium. 
HI.- 
Species endemic to the sub-sub-area 
Species distributed too ther sub-sub- 
areas 
Species with an extra-Indian distri- 
bution 
Peninsular India. 
No species. 
No species. 
Section III. — Avicularia. ^ 
(i5) Polygonum plebejum R, Br. 
Section IV. — Amhlygonon. 
(18) Polygonum tomentosum Willd. 
(19) Polygonum limbatum Meisn. 
