OLD AND YOUNG LEAVES. 



34^ 



therefore aptly termed " cruinplecl ". Leaves specially uoticeable in this respect are 

 those of the many species of dock (Rmnex), rhubarb {Rheum), and also of several 

 spring primulas (Primuia acaulis, elatior, denticulata, &c.). Frequently the 

 crumpling and rolling occur together, leaves with crumpled vernation having their 

 lateral mara'ins also somewhat i-oUed inwards. 



Young leaves which have just burst from the bud, and still retain the form they 

 possessed there, are very often seen to be " plaited ". The veins of the leaf form,. 



Kijj. 00— Unfolding of Lcives. 



', 2 Wild Cherry (Prunus aviinn). ^, * Wahiut (Juglans regia), e. 6 Wayfaring Tree ( Viburnum Lantana). 

 ' Lady's-mantle (AlchemUla vulgaris). 8 Wood-sorrel {Oxalis Acctosclia). 



as it were, the fixed framework, and it is only the green portions between which are 

 laid in folds. Fi-om the multiplicity in form and division of the leaf-veins, the kind 

 and manner of folding is also very varied. When the leaf-blade is traversed, by 

 radiating veins, as, for example, in the Lady's-mantle (AlchemiUa vulgaris), shown in 

 tig. 90'^, the leaf is folded in vei'nation just like a fan; the veins which radiate out 

 in the adult leaf are as yet parallel to one another, and the green portions which in 

 the fully-formed leaf are stretched between the veins, form deep folds, which are 

 closely packed together. The same arrangement occurs when each of the radiating 



