LEA VES. 



29 



Scabrous or rough. Sunflower, Jerusalem artichoke. 



Hirsute, or hairy. Rock rose, Verbena, Heliotrope, 

 some Pelargoniums and Geraniums, native Fuchsia (Correa). 



Setose or bristly. Nettles, spotted thistle, borage. 



Viscous (clammy or sticky). Sundews, tobacco, some 

 cypresses (Cupressus). 



There are subdivisions of these kinds of surfaces. 



The subjoined Fig. K shows a leaf of Victorian laurel, 



with the reticulated or branched 

 veins (venation) peculiar to dico- 

 tyledons clearly defined. 



Figure K. 



1 'is the midrib (Costa' 1 ), giving off 

 2, the primary veins. The smaller 

 network of veins branching all over the 

 leaf are secondary veins (3). 4 is the 

 petiole or leaf-stalk. 



When the cellular portions of a leaf 

 have decayed, by being steeped in water, 

 the vascular portions — namely, the 

 midrib and primary and secondary 

 veins, together with the petiole — are 

 left, forming what is called a ' skeleton 

 leaf.' The veins of a dicotyledonous 

 leaf appear like network ; while in the 

 generality of monocotyledons they are 

 straight or slightly curved. 



Plate III. p. 31, shows leaves of the following shapes : — 



Fig. 1. Pinnate leaf of elderberry ash. — A compound leaf, having 

 leaflets arranged on each side of a central rib. Examples : — Rose, 

 jasmine, Wonga Wonga vine, Moreton Bay jasmine, English ash, 

 Wistaria. 



Fig. 2. Pinnatipartite leaf of native celery. — A simple leaf cut 



1 Costate, provided with ribs, as applied to the pro7?iinent bundles of 

 vessels in leaves. 



