[Vor. 11 
432 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
The frequency distribution of number of seeds per locule in the 
4 series is shown in table хі, while the distribution of number of 
seeds per capsule, comprising 3 locules, appears in table хп. 
The distributions of seeds per locule, reduced to percentage 
frequencies, are represented graphically in fig. 6. These dis- 
tributions require consideration from 2 sides: first, that of the 
differences between the series collected in different years in the 
same habitat, or in different habitats in the same year; second, 
that of their general nature as considered in comparison with 
biologieal frequency distribution in general. While neither of 
these questions can be fully considered independently of the 
other, the discussion of the difference in the material associated 
with year or habitat can be made in a preliminary way in simpler 
terms, and hence will be first taken up. 
These 4 series have in common a wide range of variation in 
seed number, giving broad, relatively flat-topped distributions. 
In all series the diaiibition 4 is bimodal. There is а conspicuous 
primary or secondary mode on 0 seeds per locule and another in 
the general region of 8 to 14 seeds per locule. 
The agreement between the series from the habitats is in general 
very good in 1907, but in 1906 the 2 series differ conspicuously. 
That taken at Jefferson Barracks has a conspicuous mode on no 
TABLE XIII 
STATISTICAL CONSTANTS FOR NUMBER OF SEEDS PER LOCULE 
Series N Mean Standard Coefficient of 
deviation variation 
Meramec Highlands 
(D. 2... 6051| 13.7708+.0588| 6.7898--.0416|  49.30582-.3684 
Meramec Highlands 
А n 5201| 12.79632-.0623| 6.6698--.0440|  52.12292-.4280 
Jefferson Barracks 
BED. 22 3360| 10.3009--.0842| 7.9394--.0595|  70.27932-.8154 
Jefferson Barracks 
er tv. 4162] 10.9077--.0670|  6.40862-.0473| 58.7530--.5645 
py 906 —1907 5647 
Meramec Highlands, — | 4-0.9745-.0857 | --0.12002-.0607 | — 2.8171+- 
+ 
Jefferson Barracks | — | —0.6068 3.1076 | --0.8308.3-.0760 | +11.5263+.9917 
Differences between two 
habitats (M. H.—J.B.) 0726 | —20.9735+.8948 
CB A — | 4-3.4699--.1097 | —0.4496 +. - 
mE os — | +1.8886+.0915 | +0.2612+.0646 | — 6.6301 +.7084 
