25 



251. Leaves sheathing or with sheathing 



stipules ..i 



Leaves not sheathing nor with 

 sheathing stipules 



252. Stem solid ; leaf sheath not split 

 Stem hollow ; leaf sheath split . . . 



253. Perianth regular, or nearly so ... 

 Perianth irregular 



254. Submerged or floating plants 

 Plant not submerged nor floating 



255. Ovary 1-celled 



Ovarv 3-celled 



256. Stamens 3 ... 

 Stamens 6 ... 



257. Stamens 3 ... 

 Stamens 6 ... 



258. Ovary cells, 2-ovulate 



Ovary cells, 1- or many-ovulate ... 



259. Veins of leaves diverging from 



midrib... 

 Veins of leaves parallel to midrib 



Naiudaceae (p. 290). 



Lemnaceae (p. 290). 

 Cyperaceae (p. 293). 

 Oramineae (p. 307). 



259. 

 Hydrocharidaceae (p. 257). 



255. 



256. 



257. 

 Burmanniaceae (p. 258). 

 Taccaceae (p. 275). 

 Iridaceae (p. 274). 



258. 

 Haemodoraceae (p. 273). 

 Amaryllidaceae (p. 274). 



Scitamineae (p. 270). 

 Orchidaceae (p. 258). 



DICOTYLEDONES. 



RANUNCULACE^ 



Key to genera. 



1. Climbing plants 

 Erect plants 



2. Flowers with capillary staminodes 

 Flowers without staminodes ... 



3. Flowers regular 

 Flowers irregular 



4. Carpels with one ovule 

 Carpels with two or more ovules 



5. Carpels stalked 

 Carpels sessile ... 



6. Petals small ... 

 Petals large 



2. 

 3. 



3. Naravelia. 



1. Clematis. 



4. 



6. Uelphimum. 



5. 

 6. 



2. Thalictrum. 



4. Ranunculus. 



5. Coptis. 



7. Paeonia. 



1.— CLEMATIS. 

 Key to species. 



1. Leaflets irregularly incise-serrate 

 Leaflets entire ... 



2. Filaments hairy 

 Filaments glabrous 



3. Filaments much prolonged 

 Filaments not prolonged beyond anther 



1. grata. 



2. 



2. caesariata. 



3. 

 3. 



4. 



