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 Cyperacea?) The same as utricle. 

 Perigynous (of stamens) Attached to the calyx. 

 Petiole A 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 The 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, 



OrchidecB). 

 Proterandrous When the stamens are mature before the stigma 



in the same flower (Labiatce). 

 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, Laburmun). 



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. 



