44 MOVEMENTS OF CURVATURE 



Solanum jasminoides are, for instance, able to coil around a support (Fig. 13), 



FlG. 10. Tendrils of Cobaea scandens. 

 with three pairs of leaflets, and a branched te 

 the claw-like ends are shown slightly magnified. 



FIG. ii. Dalbergia linga. a, young stem and 

 leaves ; , young leaf with the curved terminal 

 pair of pulvini ; , older leaf (reduced) with one 

 pulvinus attached and its leaflets thrown off (after 

 Ewart). 



A young branch (a) and an older one (e\ each bearing a leaf (b) 

 \ tendril ; (e) has grasped and (a) is grasping a support (c) ; at (d) 



while in Fumaria officinalis, var. Wirt- 

 geni, the slender leaf-segments act in 

 the same way as irritable attaching 

 organs. The more or less tendril- 

 like leaf-tips of Corydalis claviculata, 

 Gloriosa superba, Flagellaria indica, and 

 Littonia form coiling attaching organs 

 and show a transition from typical leaf- 

 climbers to typical tendril-climbers, the 

 first-named plant possessing tendrils 

 which approximate in character to 

 those of Lathyrus. 



Among petiole-climbers are Solanum 

 jasminoides , Clematis vitalba, Atragene, 

 Tropaeolum and Lophospermum scan- 

 dens, in which the petiole bears a normal 

 leaf lamina, although it may have coiled 

 around a support. The tropical Dal- 

 bergia linga (Boerlage) is of interest 

 since in this plant the basal pulvini of 



