164 



ORGANOGRAPHY. 



Generally speaking the leaves Avith true-netted or feather- veined 

 venation are longer than broad, which is also commonly the case 

 Avith parallel-veined leaves ; Avhile those Avhich are radiated or 

 palmately veined are more or less rounded. When a leaf is 

 nearly of the same breadth at the base as near the apex, nar- 

 row, and with the two margins parallel {figs. 295, a, and 316), 



-Fi^r. 314. 



Fig. 3 1 5. Fig. 316. Fig. 3 1 \ 



Fig. 320. 



Fig. 32 



Fig.Z'. 



Fig. 323. 



Fig. 314. Leaf of Elm, with its margin biserrate, and unequal at its base. 



Fifj. 31.5. Unequal or oblique leaf of a species of Begonia. Fig. 316. 



Linear leaf of Goose-grass (Oulium Apurinc) Fin. 317. Lanceolate 



leaf. Fig. 'i\f>. Aceroae or needle-shaped leaves of .Juniper (.1 miiperus 



comvninin) Fig. 319. A cuneate and mucronate-pointed leaf. Fig. 



i\'H). Cordate ami acuminate leaf. Fig. ti21. Oblong leaf of Bladder- 

 Senna (CW«/''« artoretc/w) Fig.ii22. Ovate leaf, with its margin ser- 

 rated. Fig. 323. Obovate leaf. 



it is called linear, as in Gentiana Pneumo7\anthe, and most 

 Grasses ; Avhcn a linear leaf terminates in a sliar]) rigid ])oint like 

 a needle, as in the common Juniper {Jtmiperus connnunis), and 

 in many of our Pines, Firs, and Inarches, it is acerose or needle- 

 shaped {fig. 318). When a leaf is very narrow, and tapers 



