6 CONTENTS. 



CHAPTER XX. Morphology of the Leaf . Venation 106 



1, Veins simple and parallel, as in the Endogens Parallel- veined. 



2, Veins dividing without uniting again, as in Ferns Fork- veined. 



3, Veins netted, as in the Exogens, viz. : 



a Larger veins arranged as in a feather Pinni- veined. 



6 Larger veins 5 to 9, arranged as the fingers Pahni- veined. 



c Larger veins only 3, arranged as the fingers Triple-veined. 



Special Veins. 



1, In feather-veined leaves. 



The chief vein forming the axis Mid-vein. 



Lateral branches of the mid-vein Veinlets. 



The branches of the veinlets ^ Veinulets. 



2, In palmi-veined leaves, or triple-veined. 



a The coequal veins running through the blade, are Veins 



b The branches of the veins, are (as in feather- veined) Veinlets, 



CHAPTER XXT. Forms of Leaves. (Morphology, continued) 112 



* Pinni-veined Leaves. 



a Lower veinlets longer than the upper. 



1, Outline of an egg Ovate. 



2, Outline of a lance, or narrow-ovate Lanceolate. 



3, Form of the Greek letter A Deltoid. 



ft The middle veinlets longest, lower and upper equal. 



4, Circular, or nearly so Orbicular. 



5, Outline of an elliptic spring Elliptical. 



6, Egg-shaped, with equal rounded ends Oval. 



7, Narrowly oval, with obtuse ends Oblong. 



The upper veinlets longest. 



8, Inversely ovate, narrower at the base Obovate. 



9, Inversely lanceolate, narrower at the base Oblanceolate. 



10, Obtuse at apex, narrowed to the base Spatulate. 



11, Shaped like a wedge, the point at base Cuneate. 



d Lowest veinlets longest and recurved. 



12, A re-entering angle, or sinus, at base. Heart-shaped. .Cordate. 



13, Base-lobes ear-shaped Auriculate. 



14, Base-lobes arrow-shaped Sagittate. 



15, Base-lobes turned outward Hastate. 



* Dissected Forms. 



a Pinnately cut or divided. 



1, With regular lateral segments Pinnatifid. 



2, With segments recurved or hooked Buncinate. 



3, Terminal segment enlarged ' Lyrate. 



4, Segments many and narrow Pinnatisect. 



5, Segments and sinuses rounded Sinuate. 



& Palmately cut or lobed. 



