KEY TO THE 

 SuB-CLASSES AND NaTURAL OrDERS. 



PAGE 



r Flowering Plants or Phanerogamia, 2 

 I Flowerless Plants or Cryptogamia, 3 



2 Dicotyledons, 4 ^ KZlcdJ^^JuU^' ^^ J^a>u:6, 



2 Monocotyledons, 5 ^ G^Thlf^ae . 



3 Leaves veined, ^ » Filices 173 



3 Leaves without veins, 10 



4 Corolla present as well as calyx, 6 



4 Corolla absent, 7 



5 Perianth^ coloured, PetaloidesB 16 



5 Perianth glumaceous, Glumiferae^ 16 Sa^ 



6 Stamens growing on the corolla, . . CoroUiflorae^ 12 



6 Stamens not growing on the corolla, 8 '^»-— x^^^^ 



7 Calyx present, Monochlamydeae 14 



7 Calyx absent, , . . . . . . Achlamydeae 1 5 



8 Stamens hypogynous, 9 i%^Jjf\y J^. 0>A" ' ; 



8 Stamens perigy nous or epigynous, , , Calyciflorae 10 

 _ , . , — t«ru/-4. above . ^ ...a 



9 Petals united, Corolliflorae 12 



9 Petals separate, Thalamiflorae 9 



10 Leaves imbricated, .... Lycopodiaceae 178^^- 



10 Leaves whorled, Equisetaceae 1 79 



Thalamiflorae. 



Calyx a)td corolla present. Staviens hypogynous, i.e. inserted upon the recep- 

 tacle {thalamus) — or upon a disk which is hypogynous. Corolla polypeialous. 

 Stamens indefinite (more than 20), ii 



Stamens definite (less than 20), 12 



11 Pistil apocarpous,^ T^ . '*^*^'^' Ranunculaceae 17 

 II Pistil s yncarpous._ 1 3 • "fo^^-e-rWe^. 



12 Flowers irregular, 18 

 12 Flowers regular, 19 



13 Ovary i -celled, 14 



13 Ovary many-celled, 15 



