318 APPENDIX I 



Protogyny, the form of dichogamy in which the female organs 



(gynaeceum) mature before the male (androecium). 

 Protoplasm, the viscous or jelly-like substance, which forms 



the essential part of the "cells" or individual units of 



which all living creatures, both plants and animals, are 



built up (p. 9). 

 Raceme, a simple inflorescence in which stalked flowers are 



borne laterally on a central axis, the oldest flowers 



being at the base. 

 Rachis, the axis of a compound leaf. 

 Ray Florets, the outer flowers of the capitulum of the 



Compositae, which often difl'er from the Disc Florets 



iq.v.). 

 Receptacle, the portion of the axis of the flower which bears 



the floral envelope, and the male and female organs ; the 



axis bearing the florets in the Compositas (p. 18). 

 Regular = Actinomorphic {^.v.). 

 Reserves, food material stored in the plant for future use 



(p. 11). 

 Respiration, the gaseous exchange between a plant and the 



atmosphere, corresponding to the breathing of animals. 



Oxygen is absorbed and carbon dioxide given out (p. 11). 

 Rhizome, a creeping or prostrate, subterranean stem, bearing 



erect, leafy shoots. 

 Root-stock = Rhizome {q.v.). 

 Rosette, applied to a group of leaves, arranged in a very close 



spiral, the internodes between them being very short 



(p. 75). 

 Runner, a slender, prostrate stem-branch, usually rooting 



(p. 100). 

 Saprophyte, a plant deriving its nourishment from decaying 



organic matter (p. 287). 

 Scale, a disc-like outgrowth, usually of superficial origin, 



especially on leaves (p. 26). 



