194 



FORMATIONS AND GUILDS 



[Part I, 



a support, curl round it. Morphologically the tendrils are either leaves c 

 axes. Oecologically they are very varied, so that, following H. Schencl 



we may arrange tendril 

 climbers, in the wide; 

 sense, into si.^ group 

 according to their mode 

 of climbing : — 



In leaf- climbers a par 

 petiole or blade, of tb 

 otherwise unmodified le 

 is endowed with the ni 

 cessary irritabilit}'. Ft 

 instance, Clematis V 

 talba is a petiole-climbe 

 Fumaria officinalis in i 

 varieties Wirtgenii an 

 vulgaris a leaf - blac 

 climber ; Flagellaria i: 

 dica, a monocotyledoi 

 ous plant common in tl 



Fig. io.v Secuiidaca Sellowiana, Klotzsch. Lateral shoot tropics of the Old Worl 



Schenck'' '" """''■ '^"■°""^'"" °' "''""' '"'• ^^'" "■ is a leaf-tip climber. 



Fig. 104. Dalbergia variabilis, \"og. Old 

 and considerably thickened twining branch. 

 Two-thirds of natural size. After H. Schenck. 



Fig. 105. .Strychnos triplinervia, Mart. Sci 

 what old lign'itied and thickened climb. 

 hooks. 



In leaf-tendril clhnhcrs. the leaf, or a part of it, is differentiated as 

 filamentous organ functioning as a tendril only. We see this in the i' 

 and other Vicieae, Cucurbitaceae, and many other plants. 



