ee 
cimens of Acantholimon diapensioides, Hedysarum cephalotes 
and Eurotia ceratoides. The slope exposed to the south was 
almost bare; theré were only a few scattered specimens of 
Eurotia and Ephedra Fedtschenkoi, a very few of Trigonella, 
Stipa orientalis, and Serratula procumbens. Of these few species, 
Ephedra, Stipa, and Serratula were lacking on the slope ex- 
posed to the north. 
Only the lower part of the slope toward the south was 
more densely covered with species from the other side. In 
the bottom of the cleft the species from the slope exposed to 
the north were growing as well as Arenaria Meyeri, which 
was only found here. 
Another parallel cleft revealed similar conditions. The 
slope toward the north has a fine cespitose growth with yel- 
low and red flowers; here were quantities of Hedysarum ce- 
phalotes, Trigonella Emodi, Oryzopsis molinioides, Agropyrum 
longearistatum, Eurotia, Solenanthus stylosus, and further down 
Artemisia. The slope toward the south is rather bare, at the 
upper part we found only Eurotia and Ephedra, lower down, 
in addition to these two, Stipa orientalis, Artemisia sp., Astra- 
galus dolichopodus, and Nepeta daénensis. The bottom of the 
cleft was broad and flat in some places and has the same 
vegetation as on the plain above. 
The species included in these examples nearly all grow 
on the above-named plain, but they are distributed in an- 
other way, and in the clefts reveal their varying grades of 
hardiness to drought, Eurotia, Ephedra, and Stipa are the 
most hardy, Arenaria Meyeri the least. 
Eurotia and Stipa are the chief plants in what I propose 
calling the Eurotia-formation, which is widely found in 
Pamir on all mountain slopes with a southern exposure. 
Although all its species are to be found in the Trigonella- 
formation, yet the selection is so restricted and so charac- 
teristic that it seems to deserve consideration as a separate 
formation. This will be discussed further, later on. 
The most hardy species named occur again and again 
on the arid slopes exposed to the south or west. Often in 
such places Eurotia is the only plant-species found, and it 
has a scattered growth. Stipa is likewise common, Cicer 
