dimorphic and trimorphic, ii. [132], [140];
sterility of, from changed conditions, ii. [163]-[165];
from contabescence of anthers, ii. [165]-[166];
from monstrosities, ii. [166]-[167];
from doubling of the flowers, ii. [167]-[168];
from seedless fruit, ii. [168];
from excessive development of vegetative organs, ii. [168]-[171];
influence of selection on, ii. [199]-[201];
variation by selection, in useful parts of, ii. [217]-[219];
variability of, ii. [237];