Cytisus laburnum, i. 387, 389, 390, 396.
Cytisus purpureo-elongatus, ovules and pollen of, i. 389;
production of, i. 390.
Cytisus purpureus, i. 387, 388, 389, 390, 396.
Dahlbom, effects of food on hymenoptera, ii. [281].
Dahlia, i. 369-370, ii. [147];
bud-variation by tubers in the, i. 385;
improvement of, by selection, ii. [216];
steps in cultivation of, ii. [261];
effect of conditions of life on, ii. [273];