6 NATIVE LEGUMES IN NEBRASKA AND KANSAS. 
The corresponding data for 1908 are as follows: 
333 Psoralea, found on 9 out of the 14 plats. 
185 Amorpha, found on 8 out of the 14 plats. 
340 Kuhnistera, found on 8 out of the 14 plats. 
12 Astragalus, found on 4 out of the 14 plats. 
77 Vicia, found on 3 out of the 14 plats. 
57 Lotus, found on 4 out of the 14 plats. 
3 Aragallus, found on 1 out of the 14 plats. 
1 Baptisia, found on | out of the 14 plats. 
4 Lespedeza, found on 1 out of the 14 plats. 
The variation in the relative numbers of representatives of different 
genera found in the two seasons is due largely to the fact that the ma- 
jority of counts made in 1908 were on the rolling lands of southeastern 
Nebraska and in 1909 on the level prairies of the south-central part 
of the State. On the hills, Kuhnistera is much more abundant than 
on the level land and Psoralea is represented mostly by Psoralea 
floribunda, which is a very large plant, and hence the individuals are 
not very numerous when compared with the smaller, more gregarious 
P. argophylla, which is almost the sole representative of the genus 
on the more lével prairies of south-central Nebraska. This plant 
often forms dense patches (not, however, excluding the grasses), 
which cover a very large proportion of the prairie, giving the whole 
a silvery cast. 
Combining the figures for the two years we have the following 
totals: 
3,308 Psoralea, found on 29 out of the 36 plats. 
704 Amorpha, found on 22 out of the 36 plats. 
521 Kuhnistera, found on 17 out of the 36 plats. 
151 Astragalus, found on 17 out of the 36 plats. 
637 Vicia, found on 9 out of the 36 plats. 
123 Lotus, found on 7 out of the 36 plats. 
21 Aragallus, found on 4 out of the 36 plats. 
6 Baptisia, found on 4 out of the 36 plats. 
78 Lespedeza, found on 4 out of the 36 plats. 
10 Morognia, found on | out of the 36 plats. 
2 Meibomia, found on 2 out of the 36 plats. 
RELATIVE IMPORTANCE OF THE DIFFERENT GENERA. 
The number of plants of the first four genera, at least, and the 
number of plats on which they were found probably give a fair idea 
of the relative importance of the representatives of these genera as 
nitrogen gatherers, especially when considered in connection with the 
sizes of the plants. It is certain that they are not all equally efficient 
in this work, but on this point no information is available. The 
large numbers of Psoraleas and their wide and comparatively uniform 
distribution, as shown by these figures, make them stand out strik- 
ingly as the most important of the group. The other genera are 
much less important than the first four. 
(Cir. 70] 
