40 
30. 
31. 
CLIMBERS. 
Leaves opposite. 
. Leaves simple. 28. 
Leaves compound. 32. 
Simple. 
. Scrambling: pith chambered. 
Climbing by the leaf-stalks. 
Climbing by aerial roots. 30. 
Twining. 31. 
Leaves nearly entire. 
Leaves distinctly serrate. 
Leaves distinctly dentate. 
Sap not milky: pith excavated. 
Sap milky: pith continuous. 
Compound. 
. Twining or scrambling. 33. 
With tendrils or climbing roots. 34. 
. Twigs 4-lined: scrambling. 
Twigs rounded: twining. 
. Climbing by aerial roots. 
Climbing by tendrils. 35. 
. Tendrils ending the leaves. 
The leafstalks prehensile and coiling. 
Forsythia. 
Clematis. 
Decumaria. 
Hydrangea. 
Schizophragma. 
Lonicera. 
Periploca. 
Forsythia. 
Jasminum. 
Campsis. 
Bignonia. 
Clematis. 
