THE DIFFERENT FORMS OF FLOWERS ON PLANTS OF THE SAME SPECIES

by CHARLES DARWIN, M.A., F.R.S.




TO

PROFESSOR ASA GRAY

THIS VOLUME IS DEDICATED BY THE AUTHOR
AS A SMALL TRIBUTE OF RESPECT AND AFFECTION.




CONTENTS.


INTRODUCTION.


CHAPTER I.
HETEROSTYLED DIMORPHIC PLANTS: PRIMULACEAE.

Primula veris or the cowslip.--Differences in structure between the two forms.--
Their degrees of fertility when legitimately and illegitimately united.--P.
elatior, vulgaris, Sinensis, auricula, etc.--Summary on the fertility of the
heterostyled species of Primula.--Homostyled species of Primula.--Hottonia