Fl CONTENTS. 



CHAPTER III. 



HETEROSTTLED DIMORPHIC PLANTS continued. 



Linum grand ifloruin, long-styled form utterly sterile with own-fonn 

 pollen Linura perenne, torsion of the pistils in the long-styled 

 form alone Homostyled species of Linum Pulmonaria offici- 

 nalis, singular difference in self-fertility between the English 

 and German long-styled plants Pulmonaria angustifolia shown 

 to be a distinct species, long-styled form completely self-sterile 

 Polygonum fagopyrum Various other heterostyled genera 

 Rubiacefe Mitchella repens, fertility of the flowers in pairs 

 Houstonia Faramca, remarkable difference in the pollen-grains 

 of the two forms; torsion of the stamens ia the short-styled 

 form alone ; development not as yet perfect The heterostyled 

 structure in the several Rubiaceous genera not due to descent in 

 common . . Page 81-136 



CHAPTEK IV. 



HETEROSTYLED TRIMORPHIC PLANTS. 



Lythrum salicaria Description of the three forms Their power and 

 complex manner of fertilising one another Eighteen different 

 unions possible Mid-styled form eminently feminine in nature 

 Lythrum Grsefferi likewise trimorphic L. thymifolia dimor- 

 phic L. hyssopifolia homostyled Nesjea verticillata trimorphic 

 Lagerstrcemia, nature doubtful Oxalis, trimorphic species of 

 0. Valdiviana 0. Regnelli, the illegitimate unions quite 

 barren 0. speciosa 0. sensitiva Homostyled species of Oxalis 

 Pontederia, the one monocotyledonous genus known to include 

 heterustyled species 137-187 



CHAPTER V. 



ILLEGITIMATE OFFSPRING OF HETEROSTYLED PLANTS. 



Illegitimate offspring from all three forms of Lythrum salicaria 

 Their dwarfed stature and sterility, some utterly barren, some 



