KINDH AM) FORMS UF LKAVKS. 



45 



Nor are what we call veiuM to bo lik(MH'<l particuliiily to the bloodvesselH of 

 animals, lint this naiiio is not so had ; for tiie minute (ihres which, \inite<I in 

 hiindU'S, make up the rihs juid veins, are liollow tubes, and serve more or less 

 for conveying the sap. 



125. As to tiie nii/ifuj, or the arrangement of the fiamework in th(* bhido, 

 loaves are divided into two classes, viz. : ist, the XrH^ulreinril or IMiralatcil ; 

 !ind 2(1, th(^ Pnr<(//r/-ninri/ or \rrrrtf. 



126. Netted-Veined or Reticulated leaves are those in which the veins branch off 

 from the rib or ribs, and divide a^'ain and again, and some of the veins and veinJets 

 run into one another, 



so formin<j reticulations 

 or meshes of network 

 t]ir9Ughout the leaf. 

 'I'liis is shown in ihii 

 (4)uinco-leaf (Fig. <S2); 

 also in the Linden or 

 liasswood (Fig. St,^, 

 and the IMaple (Fig. 

 84), whei'o the liner 

 meshes appear in one 

 or two of the leaves. 



I 27. Netted - veined 

 loaves belong to ])lants 

 which have a pair of 

 seed-leaves to their em- 

 bryo (48), and stems 



of the exogenous structun* (115). That is, these throe kinds of structure, iiv 

 embryo, stem, and leaf, gonei'ally go togotlu'r. 



128. Parallel-veined or Nerved loaves are those in which the ribs and veins run 

 side by side without braiichin<j (or with minute cross-veinlets, if any) frouj the 

 base to the point of the blade, as in lndiau-(Jorn, Lily of the Valley (Fig. 85), 

 \c., or sometimes from the midrib to the mai-gins, as in the Jianana and ('alia 

 (Fig. 86). Such [)arallol veins have been called Xfrveti, as just explained (124). 

 Leaves of this sort belong to plants with one cotyledon to their embryo (47), 

 and with endogenous stems {113). 



83. Linilcii. 



Ni'ttodvciiii'tl Loaves of 



t4. Mupln. 



P 



