Cuap. IL LEAF-CLIMBERS, , 45 
CHAPTER II. 
Lrar-CLiMBers, 
Plants which climb by the aid of spontaneously revolving and sensitive 
petioles — Clematis — Tropxrolum — Maurandia, flower-peduncles 
moving spontaneously and sensitive to a touch—Rhodochiton— 
Lophospermum — internodes sensitive-— Solanum, thickening of 
the clasped petioles—Fumaria—Adlumia—Plants which climb by 
the aid of their produced midribs — Gloriosa — Flagellaria— 
Nepenthes—Summary on leaf-climbers. 
WE now come to our second class of climbing plants, 
namely, those which ascend by the aid of irritable or 
sensitive organs. For convenience’ sake the plants 
in this class have been grouped under two sub-divisions, 
namely, leaf-climbers, or those which retain their 
leaves in a functional condition, and tendril-bearers. 
But these sub-divisions graduate into each other, as 
we shall see under Corydalis and the Gloriosa lily. 
It has long been observed that several plants climb 
by the aid of their leaves, either by their petioles (foot- 
stalks) or by their produced midribs; but beyond this 
simple fact they have not been described. Palm and 
Mohl class these plants with those which bear tendrils ; 
but as a leaf is generally a defined object, the present 
classification, though artificial, has at least some advan- 
tages. Leaf-climbers are, moreover, intermediate in 
many respects between twiners and tendril-bearers. 
Hight species of Clematis and seven of Tropxolwm were 
