Psidium, 488, 489.
Psilotaceæ, 228.
Psilotum, 201, 228.
Psychotria, 550.
Ptelea, 437.
Pteridium, 131, 207, 213, 214.
Pteridophyta, 2, 198, 234.
Pterigynandrum, 197.
Pteris, 199, 203, 213, 214.
Pterisanthes, 445.
Pterocarpus, 473.
Pterocarya, 350.
Pterocephalus, 560.
Pterogoniaceæ, 197.
Pterogyne, 468.
Pterostegia, 360.
Pterygophyllum, 197.
Ptilidium, 192.
Ptilota, 84.
Ptychogaster, 166.
Puccinia, 147, 148, 149, 150.
Puff-ball, 174.
Pulmonaria, 533, 534.
Pulque, 318.
Pulsatilla, 384.
Pumpkin, 480, 481.
Punctaria, 70.
Punica, 483, 488, 489, 490.
A Handbook of Systematic Botany · The Wunder Library — complete classics, free to read, with narration.