Paeony, pollen-grains of.
Parallelism between illegitimate and hybrid fertilisation.
Pavonia.
Phlox Hentzii. — nivalis. — subulata.
Planchon on Linum salsoloides. L. Lewisii. on Hugonia.
Plantago lanceolata. — media.
Polemoniaceae.
Pollen-grains, relative diameter of.
Polyanthus.
Polygonaceae.