Polygonum bistorta. — fagopyrum. pollen-grains.
Pontederia. pollen-grains. size of anthers. — cordata.
Posoqueria fragrans.
Primrose, the common.
Primula, the, heterostyled species of.
summary on.
homostyled species.
— auricula.
— equal-styled varieties.
— cortusoides.
— elata.
— elatior, Jacq.
relative fertility of the two forms.
not a hybrid.
equal-styled var. of.
— farinosa.
equal-styled var.
— hirsuta.
— involucrata.
— longiflora.
— mollis.
— Scotica.
— Sibirica.
— Sikkimensis.
— Sinensis.
relative fertility.
long-styled.
short-styled.
transmission of form, constitution and fertility.
equal-styled variety.
— stricta.
— veris.
difference in structure between the two forms.
degrees of fertility when legitimately or illegitimately united.
fertility possessed by illegitimate plants.
equal-styled red variety.
long-styled.
length of pistil.
— verticillata.
— villosa.
— vulgaris (var. acaulis Linn.).
pollen-grains.
relative fertility of the two forms.
length of pistil
Primula vulgaris, var. rubra.
Prunella vulgaris.
Psychotria.
Pulmonaria angustifolia.
anthers.
— azurea.
— officinalis.
number of flowers.
pistil.
Ranunculus aquatilis.