GLOSSARY 203 



Parietal (of ovules) — Attached to the wall of the ovary ( Viola). 



Pedicel — A flower-stalk. 



Peltate (of leaves) — Nearly round, with the petiole in the centre 



{Hydrocotyle). 

 Penicillate — Having the form of a pencil of hairs. 

 Perianth — The calyx and corolla together or calyx alone (used 



chiefly in describing Endogens). 

 Pericarp — The wall of the ovary. 

 Perigyne (in Cyperacece) — The same as utricle. 

 Perigynous (of stamens) — Attached to the calyx. 

 Petiole— K leaf-stalk. 

 Pinnate (of leaves) — Composed of numerous leaflets arranged in 



pairs on an axis ( Vetch, Elder). 

 Pinnatifid (of leaves) — Partially divided in a pinnate manner. 

 Placenta — The part of the wall of the ovary to which the ovules are 



attached. 

 Placentation — ^The mode of attachment of the ovules to the 



ovary. 

 Pollination— T\\R falling of the pollen on the stigma. 

 Pollinium — The contents of an anther-lobe where the pollen- 

 grains are attached together in a solid mass {Asclepiadece, 



Orchidece). 

 Proterandrous — When the stamens are mature before the stigma 



in the same flower {Labiata). 

 Proterogynous — When the stigma is mature before the stamens in 



the same flower. 

 Pseudocarp — An apparent fruit formed of some other part of the 



flower in addition to the mature ovary (Strawberry, Apple). 

 Pyxis — A capsule splitting horizontally {Hyoscyamus, Anagallis). 



Raceme — An inflorescence composed of stalked flowers arranged 

 on an axis, and opening in succession from below upwards 

 {Bluebell, Laburnum). 



Rachis — The axis of an inflorescence or of a pinnate leaf. 



Radicle — The part of the embryo which develops into the root. 



Receptacle — The apex of the flower-stalk from which the flowers 

 spring. 



