GLOSSARY 349 



Pscitdo-biilb — A swollen stem coniiiioii in tla- cpiphvtie 



orchids. 

 I'hris — The <ieneiic name of the bracken fern. 



Q 



Quiescent — Inactive, dormant. 



Quinine — An alkaloid extracted from the cinchona trees. 



R 



Riiiiick — The first formed root when a seed j^erminates. 



Rajflesia — A j^enus of brown leafless parasites. 



Receptacle — That part of the stalk on which the flower is 

 developed. 



Resin — A secretion from certain trees which hardens on 

 exposure. 



Respiration — The process of breathing. 



Rliinantlius — The generic name of the vcllow-rattle (a root 

 parasite). 



Rhododeniiron — A genus of popular tfowering shrubs and 

 dwarf trees. 



Root-cap — A loose covering of tissue that protects the ex- 

 treme point of the growing root. 



Root-hairs — The delicate unicellular hair^ found on the 

 young root. 



S 



Salicinc — A substance obtained from the bark of willows, 

 soluble in water and alcohol, and crystallising in bright 

 white needles. 



Salvia — A genus of labiate plants. 



Samara — Winged fruit. 



Sapropliyte — Plants that live upon decaying organic matter. 



Sarracenia — The generic name of the Xorth American 

 side-saddle plants. 



Saxifraga — A genus of dwarf Alpine plants. 



