278 Journal of the Asiatic Society of Bengal. (N.S., XV, 
decayed. Only a few living shoots of Potamogeton perfolia- 
tus and still fewer recognizable fragments of Naias major were 
found. 
It is interesting to compare the condition of the sub- 
In the Quetta and Pishin districts, at altitudes between 5,000 
and 6,000 feet (i.e. more than 3,000 feet higher than the Hamun), 
various species of Potamogeton and Naias, including forms 
apparently identical with those observed in Seistan, were found 
both in November and in January in a flourishing vegetative 
condition. The temperature of the air in these districts is 
So lower than that of Seistan, but that of the water, 
ich is derived from underground channels, appears 
to ‘be daciiediy warmer. The matter, on which no precise 
data are available, is mentioned here as one worthy of further 
investigation. 
1e most peculiar feature of the Hamun precniee is the 
great extent of the reed-beds that surround it. The slight 
salinity of the water, which is salter in some conditions ! than in 
others, probably encourages the growth of Potamogeton pectina- 
tus by inhibiting that of other species, for this plant is ene 
the most adaptable of all the submerged plants of India 
the neighbouring countries. It flourishes in the Chilka ieee 
on the east coast of India in water much salter than that of the 
Hamun in the neighbourhood of Lab-i-Baring, to the exclusion 
of all other freshwater species, while in ordinary Indian fresh- 
water lakes it is merely a comparatively unimportant member 
of the vegetation. 
VI.—SyYstTemaTIc pay OF PLANTS erp IN SEISTAN 
y Dr. N. ANNANDAL 
EMBRYOPHYTA ASIPHONOGAMA. 
I. CHARACEAE. 
1. Chara, Vaill. 
1. Chara, sp 
Loc.—Nasratabad ( Nasirabad), Seistan, No. 16; alt. 1,650’. 
In water-channel in garden with Potamogeton. 
1 Annandale, Rec. Ind. Mus. VIE, I. PP. 2 and | 
2 creas pres and Kemp, Vo foe pe Ie 
Pong - As. Soe. Benak Vel xv No. 6, i clxix 2 Boal 
(1918). 
