6 Key to Sub-Classes and Natural Orders. 



Petaloideae. 



AlonocoiyledoTis possessing a coloured perianthlff^one. 

 Ovary inferior, io8 



Ovary superior, 109 PAGE 



108 Leaves vi^ith netted veins, . . . Dioscoraceae 144 



108 Leaves with parallel veins, no 



109 Leaves with netted veins, 113 



109 Leaves with parallel veins, 114 



no Leaves aerial, in 



no Leaves floating or submerged, . Hydrocharidaceae 

 III Ovary I -celled, ...;... Orchidaceae 

 ni Ovary 3-celled, 112 



112 Stamens 3, Iridaceae 



112 Stamens 6, . 



13 Land plants, 115 



13 Aquatic plants, 



n4 Aquatic plants, 

 114 Land plants, 



15 Flowers perfect, 



. Amaryllidaceaa 



n; 



144 

 136 



140 

 141 



Alismaceae 145 



, Trilliaceae 144 



115 Flowers monoecious, . Araceae 148 



116 Floating plants with capillary floating roots, Lemnaceae 148 



116 Plants rooting in the ground, . . Naiadaceae 146 



117 Perianth 6-partite, 118 



117 Perianth none — Marsh plants, .... Typhaceae 149 



118 Flowers conspicuous, 119 



118 Flowers small brown, Juncaceae 149 



119 Style I, Liliaceae 141 



n9 Styles 3, Melanthaceae 144 



Glumlferae. 



Monocotyledons with a ghiinaceous periajith. 

 Leaves very slender within entire sheaths — stems solid, Cyperacea? 151 

 Leaves with split sheaths — stems hollow, . , . Gramiueae 160 



