Protos, Greek for first; in various compounds.
Pruinose, Pruinate, frosted; covered with a powder like hoar-frost.
Pseudo-, Greek for false. Pseudo-bulb, the aerial corms of epiphytic Orchids, &c.
Psilos, Greek for bare or naked, used in many compounds.
Pteridophyta, Pteridophytes, [156].
Pteris, Greek for wing, and general name for Fern, enters into many compounds.
Puberulent, covered with fine and short or almost imperceptible down.
Pubescent, hairy or downy, especially with fine and soft hairs or pubescence.
Pulverulent or Pulveraceous, as if dusted with fine powder.
Pulvinate, cushioned, or shaped like a cushion.