A CENSUS OF THE INDIAN POLYGONUMS. 
437 
It will be noticed that the endemic area is almost entirely restricted 
to the Himalayan range, four species going beyond it eastwards and three 
westwards. 
The following tables give .detailed lists of the Polygonums found in 
each sub^sub-area. By species distributed' to other sub-sub-areas *' is- 
meant species which are endemic to India as a whole, though not to 
the particular sub-sub-area in which they occur. By species with 
an extra Indian distribution ” is meant non-endemic Indian' species which 
are found in the sub-sub-area considered. 
I.— North-West Frontier. 
Section III. — Avicularia. 
Species endemic to the suB-sub-area i 'Polygonnmhidi.tisidXum Aitck. & Hemsley. 
Species distributed to other sub-sub- 
areas 
Section X.—^Aeondgonm- 
(71) Polygonum rumicifoHurti 
Section III. — Avicularia. 
(6) Polygonum cognatum Meisn. 
(7) Polygonum paronychioides C. A. Mey. 
(8) Polygonum salicornioides Jaub. & Spach. 
(9) Polygonum aviculare Linn. 
(10) Polygonum Bellardi All. 
(ix) Polygonum setosum Jauh. & Spach. 
(12) Polygonum tubulosum Boiss. 
(13) Polygonum polycnemoides Jaub. & Spach, 
(14) Polygonum afghanicum Meisn. 
(16) Polygonum plebejum Br. 
Species with an extra- Indian distri- 
bution 
Section VI. — Bistorfa, 
(26) Polygonum amplexicaule Don. 
23 / Section Vll.—Persicaria: 
(30) Polygonum glabrum 
(32) Polygonum lanigerum R. Br. 
(33) Polygonum lapathifolium Linn. 
(34) Polygonum Persicaria Linn. 
(39) Polygonum barbatum Linn. 
(40) Polygonum serrulatum Lagasc, 
(43) Polygonum Hydropiper Linn. 
(44) Polygonum flaccidum Meisn. 
Section Vlll.—Cephalophilon. 
(47) Polygonum glaciale Hook, f, 
(48) Polygonum alatum Ham. 
Section XI, — Tiniaria, 
(77) Polygonum Convolvulus Linn. 
(78) Polygonum dumetorum Linn. 
Total of North-West Frontier species : 25, or 31*6 per cent. 
