Prostrate. Lying flat upon the ground.
Proterogynous. Having the stigma ripe for the pollen before the maturity of the anthers of the same flower.
Prothallus. A cellular usually flat and thallus-like growth, resulting from the germination of a spore, upon which are developed sexual organs or new plants.
Pseudaxillary. Terminal but becoming apparently axillary by the growth of a lateral branch.
Pseudo-costate. False-ribbed, as where a marginal vein or rib is formed by the confluence of the true veins.
Pteridophytes. Fern-plants; Ferns and their allies.
Puberulent. Minutely pubescent.
Pubescent. Covered with hairs, especially if short, soft and downy.
Punctate. Dotted with depressions or with translucent internal glands or colored dots.
Puncticulate. Minutely punctate.