1919.] Notes on the Vegetation of Seistan. 297 
DESCRIPTION OF PLATES. 
Photographs of herbarium specimens of two grasses from 
Seistan, illustrating the direct effect of abnormal environment 
on the plant. All the figures are on the same scale, viz., one 
half natural size. 
Puate V. 
Normal specimen of Phragmites ? communis (intermediate 
~ between P. communis and P. Karka) from the edge of the 
Hamun-i-Helmand at Lab-i-Baring. Note the large size of the 
inflorescence, the comparatively lax, broad leaves and the 
thickness of the stem. This plant was between 12 and 15 feet 
high and grew at the edge of nearly fresh water. 
Puate VI. 
cimens of the same reed from the edge of a stream of 
Note the dwarfing of the whole plant, and especially of the 
inflorescence, and the stiff, upright, sharply pointed leaves. 
PLATE VIL. 
Dwarfed specimens of Aeluropus villosus from the stony 
desert at Lab-i-Baring, in which they form low, dense clumps, 
often with fairly long radiating sessile shoots. The leaves are 
small and soft. 
PratE VIII. 
Larger specimens of the same grass from the edge of a 
stream of saline water in the same vicinity. Note, again, the 
stiff, upright, sharply-pointed leaves, but also the enlarged 
