64 A US TRA LI A N BO TANY. 



the flowers into heads). — Bellis (daisy), Calendula (mari- 

 gold), Lactuca (lettuce), thistle, Dahlia, Helianthus (sun- 

 flower). 



Class XX. Gynandria (stamens and pistils united into 

 one column). — Orchis, including Diuris and Dendrobium 

 (rock lily), Stylidium. 



Class XXI. Monoecia (stamens in one flower, pistils in 

 another on the same plant). — Cucumis (cucumber), Ricinus 

 (castor oil plant), Casuarina — Australian oak — sometimes 

 Dioecious, Moms (mulberry), native Mulberry (Hedycarya), 

 Victorian Sassafras (Atherosperma), some Carex. 



Class XXII. Dioecia (flowers bearing pistils only, and 

 flowers bearing stamens only on different plants). — Salix 

 (willow), Smilax (sarsaparilla), Aucuba Japonica, Phoenix 

 (date palm), Poplar, Vallisneria spiralis, native Snowdrop 

 (Anguillaria l ). 



Class XXIII. Polygamia (in some flowers, stamens 

 only ; in others, pistils only ; in others, both pistils and 

 stamens on the same plant). — Rhagodia, Celtis, Trema, 

 some palms. 



Class XXIV. Cryptogamia (flowers concealed). — 

 Lichens, mosses, mushrooms, ferns, seaweeds. 



These Classes take their names from Greek words, 

 descriptive of their construction. Thus, Class i is termed 

 monandria, signifying ' one stamen.' Class 2 has hvo 

 stamens ; Class 3, three stamens ; and so on, up to Class 

 10 (deeandria), which has ten stamens. Class 5, possessing 

 five stamens, includes one-tenth of the whole vegetable 

 kingdom. Class 1 1 comprises all those plants having from 



1 Pistillate, stamenate, and bisexual plants of Anguillaria are often 

 found growing together. 



