XXU CONTENTS. 



CHAPTEE III. 



Hetbrosttlbd Dimoephic Plants — amtinued. 



Linum grandiflorum, long-styled form utterly sterile with own-form 

 pollen — Linum perenne, torsion of the pistils in the long-styled 

 form alone — Homostyled species of Linum — Puhnonaria offici- 

 nalis, singular difference in self-fertility between the English 

 and G-erman long-styled plants — Pulmonaria angustifolia shown 

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

 Polygonum fagopyrum — ^Various other heterostyled genera — 

 Rubiacese — Mitchella repens, fertility of the flowers in pairs — 

 Houstonia — Paramea, remarkable difference in the poUen-graina 

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

 form alone ; development not as yet perfect — The heterostyled 

 structure in the several Eubiaceous genera not due to descent in 

 common Page 81-136 



CHAPTEE IV. 



Hbtbbostvled Tbimoephic 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 Grrsefferi likewise trimorphic — L. thymi- 

 folia dimorphic — L. hyssopifolia homostyled — Nessea verticillata 

 trimorphic — ^Lagerstrcemia, nature doubtful — Ozalis, trimorphic 

 species of — 0. Valdiviana — 0. Eegnelli, the illegitimate unions 

 quite barren — 0. speoiosa — 0. sensitiva — Homostyled species of 

 Oxalis — Pontederia, the one monocotyledonous genus known to 

 include heterostyled species .. .. 137-187 



CHAPTEE V. 



Illegitimate Qfpspring of Heterostyled Plants. 



Illegitimate offspring from all three forms of Lythrum salicaria — 

 Their dwarfed stature and sterility, some utterly barren, some 



