+Flowers+ 149
Floral envelopes—Buttercup—Gamopetalous—Polypetalous—
Epipetalous—Apocarpous—Woodsorrel—Syncarpous pistil—Geranium-
coloured bracts—Composite flowers—Fading flowers—Flower
expansion—Flower dissection—Cruciferous plants—Papilionaceous
flowers—Honey glands—Entomophilous flowers—Catkins—Monœcious
and diœcious flowers—Arum—Protection from insects and moisture.