--Primula
elatior shown to be a distinct species.--Hybrids between other heterostyled
species of Primula.--Supplementary note on spontaneously produced hybrids in the
genus Verbascum.
CHAPTER III.
HETEROSTYLED DIMORPHIC PLANTS--continued.
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.--Pulmonaria officinalis, 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.--Rubiaceae.--Mitchella
repens, fertility of the flowers in pairs.--Houstonia.--Faramea, remarkable
difference in the pollen-grains 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 Rubiaceous genera not due to descent in common.
CHAPTER 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 Graefferi likewise
trimorphic.--L. hymifolia dimorphic.
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