erg, 
loma, Chartoloma and Octoceras; the Papilionaceae include 
Ammodendron, Halimodendron, Ammothamnus, Eremosparton, 
Alhagi and Astragalus. As representatives of other families 
we may mention: Heliotropium, Echinospermum, Calligonum 
(17 species) various Umbelliferae (Dorema, Ferula etc.), and 
Compositae (Artemisia, Echinops, Cousinia, Microlonchus, Scor- 
zonera, Streptorhamphus, etc.). The Salsolaceae are represented 
by much the same species as in the salt-deserts, but they are 
more luxuriantly developed; noteworthy are Alexandra Leh- 
manni, Caroxylon (Salsola) hispidulum, C. subaphyllum, Eurotia 
Eversmanniana. Smaller families are also represented by a 
number of species: Zygophyllaceae, Rutaceae, Tamaricaceae, 
Gnetaceae (Ephedra), and of Monocotytedons the following may 
be named: Biarum, Tulipa, Merendera, Gagea, Heleocharis. 
4) The area of the Serafshan River. 
Lying as this does in the mountainous regions along 
the upper courses of the river, it is outside of our area and 
need not be considered. 
Following on the introductory description just summarised, 
Borszczow then deals with the families of plants with respect 
to the distribution of genera and species. This analysis oc- 
_cupies the greater part of his work and leads him to the 
following general conclusions: 
“1. The majority of the commoner plants of Central 
Russia with a distribution west of the Caspian Sea extending 
to Trans-Caucasia, have as their southern limit of distri- 
bution east of the Caspian Sea in Aralo-Caspia, the parallel 
of 517/2° N. lat. 
2. When these forms occur farther east in Siberia, the 
boundary limiting their area of uninterrupted distribution 
lies outside of Aralo-Caspia and always north of 51!/2° 
N. lat. 
3. Most of the typical steppe-plants met with in 
southern Russia and distributed towards the west from the 
Caspian to the foot of the Caucasus, attain their southern 
limit in Aralo-Caspia at the parallel of 49° N. lat., and 
their eastern boundary at the meridian of the Mugodshar 
