CONTENTS. 



6, Rolled with its axis, a from one edge into a scroll Convolute. 



b from both edges inward Involute. 



c from both edges backward Revolute. 



* General ; regarding the whole bud. 



1, Edges meeting, Valvate, with the margins straight Valvate. 



with the margins involute Induplicate. 



with the margins revolute Reduplicate. 



2, One edge overlapping, each leaf oblique Twisted or Contorted. 



8, Both edge? overlapping, Imbricate. 



a Conduplicate leaves, alternately embracing Equitant. 



half embracing Obvolute. 



b Learas in threes, one of them exterior Triquetrous. 



c Leaves in fives, two of them exterior Quiucuncial. 



d Each leaf or petal embracing all those within Convolute. 



Exterior petal largest (Sweet Pea) Vexillary. 



4, Qamopetalous corolla folded in plaits, plaits straight Plicate. 



plaits oblique Supervolute. 



CHAPTER XIX. Of the Leaf. Phyllotaxy SI 



CHAPTER XX. Morphology of the Leaf.- Venation 91 



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. 



b Larger veins 5 to 9, arranged as the fingers Palmi-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 vein?, are (as in feather- veined) Veinlets. 



CHAPTER XXI. Forms of Leaves. (Morphology, continued) 95 



* 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 veiulets 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 cat or divided. 



