66 AETIFICIAL KEY TO THE FAMILIES. 



Flowers simj^ile and regxdar, and with more than 10 stameyis. (Usually 

 a considerable number of stamens.) 



A. — Filaments of the very numerous stamens united 



into a long tube Malloio famihj , 108 



B. — Filaments of the stamens unconnected, unless slightly at the base. 

 • Plants living in ivater. 



A. Leaves floating flat upon the surface. 



Ovaries absent. Stamens 12 to 20 Frogbit, 403 



Ovaries present. 



Ovaries numerous and free Water Snow-cups, 86 



Ovaries consolidated into a single body. 



Leaves net- veined Water-lily family, 81 



Leaves parallel- veined Limnocharis, 405 



B. Leaves raised more or less vertically out of the water. 



Stems submerged. 



1. Leaves round or heart-shaped Water-lily family, 81 



2. Leaves long, narrow, and prickly Water Soldier, 405 



3. Leaves arrow-shaped Water Arrow-leaf, 403 



c. Leaves lanceolate, on aerial stems ; flowers yeWoyr.. ..Spear-wort, 84 



** Plants living on dry land; if by the waterside, not in the water, as aquatics. 



f Plant covered with stings hke those of nettles Loasa, 285 



tt Plant destitute of stings. 



No leaves ; stems remarkably succulent, and often 



prickly Cactus family, 289 



Plant more or less leafy. 

 Flowers with stamens only. 

 a. Flowers minute, in dense globular heads or 



oblong spikes Acacias, 185 



6. Flowers in pendulous corymbs Begonias, 351 



c. Flowers solitary, or in small upright corymbs.JfJosacctc (some), 190 

 Flowers with botli stamens aud pistils. 



Stem and flower-stalks prickly Eosc family (some), 197 



If any prickles, none upon the flower-stalks. 



Ovary heloio the perianth. 

 Trees or shrubs. 



Leaves covered with pellucid dots Myrtle family, 979 



Leaves dotless. 



Flowers crimson .... Combrctum, 285 



I'lowera white or cream-coloured Mock-orange, 31!) 



IlEnBA(;EOUS. 



Flowers deep yellow Hortonia, 280 



