a 
il” s ud ’ . >, L- x | Dew 4 @ “2 we SL 4d >? a 
as PN! ee UE as »+ ‘ ai <4 lhe y Ty / fg ph a Fer, 
. ; wt % : oe we > ? 
+ aoe a *. 
1 f i ‘. 
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X - 
{ 
uctural and P hystological Botany. 
Sz. ee 
: IS Ye 
uN 
‘ x 
-- finest ramifications of veins are found almost without excep- 
- tion in twining plants among Dicotyledons.! 
- The lamina is as a rule flat, rarely cylindrical (Fig. 192), 
Fic. 192.—Cylindrical leaf of the Fic. 193.—Ascidiform leaf of pitcher- 
\ stonecrop, Sedum acre. plant, Vesenthes. 
2 aN NY 
AZ, 
Fic. 194.—Zornelia fragrans, an Aroid, with perforated leaves. 
_. 1 {The parallel venation of the leaves is especially characteristic of 
_ Endogens or Monocotyledons ; while all the other modes of venation, — 
comprised genera'ly in the term reticulated or net-verned, are found 
nearly exclusively in Exogens or Dicotyledons.—ED. ] 
