that of the perfect flowers.--Oxalis acetosella.--O. sensitiva, three forms of
cleistogamic flowers.--Vandellia.--Ononis.--Impatiens.--Drosera.--Miscellaneous
observations on various other cleistogamic plants.--Anemophilous species
producing cleistogamic flowers.--Leersia, perfect flowers rarely developed.--
Summary and concluding remarks on the origin of cleistogamic flowers.--The chief
conclusions which may be drawn from the observations in this volume.


INDEX.


...


THE DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES.


INTRODUCTION.

The subject of the present volume, namely the differently formed flowers
normally produced by certain kinds of plants, either on the same stock or on
distinct stocks, ought to have been treated by a professed botanist, to which
distinction I can lay no claim. As far as the sexual relations of flowers are
concerned, Linnaeus long ago divided them into hermaphrodite, monoecious,
dioecious, and polygamous species. This fundamental distinction, with the aid of
several subdivisions in each of the four classes, will serve my purpose; but the
classification is artificial, and the groups often pass into one another.

The hermaphrodite class contains two interesting sub-groups, namely,
heterostyled and cleistogamic plants; but there are several other less important