COMPOUND LEAVES. 



93 



ward ; Muscadine ; Entire, with unbrolten margin ; Milkweed ; 

 Erase, as if gnawed by insects; Nightshade; Incised, with deep, 

 irregular notches ; Red Maple ; Repand, like the margin of an open 

 umbrella ; Oxlip ; Serrate, with sharp teeth pointing forward ; Chest- 

 nut ; Sinuate, with rounded sinuses ; Black Oak ; Undulate, wavy- 

 margined ; Garden Sorrel, Dock. 



196. A Simple Leaf has one blade, and one petiole which 

 is continuous Vith the ribs and veins ; when the petiole is 

 wanting, the leaf is sessile. The leaves described in this 

 Lesson are simple, with the exception of Clover, Marsilea, 

 Medicago, Mimosa, and Trefoil, which are compound, and 

 of which the leaflets only are described here. 



LESSON XVIII. 



COMPOUNB LEAVES-LEAS' TEXTUEE AND SUEFACE. 



197. Compound leaf. 198, 199. Pinnate leaves. 200, 201. Pal- 

 mate leaves. 202. Leaf-texture. 203. Leaf-surface. 



197. A Compound Leaf has 1, 

 2, 3, or many blades, each blade 

 jointed to a common petiole. 

 The separate blades are called 

 leaflets, or folioles (L. foliolus, 

 leaflet) ; the whole, with their 

 common petiole, make a com- 

 plete leaf. The leaflets, as we 

 saw in Lesson XVII., in vena- 

 tion, form, etc., take the habit 

 of simple leaves. Compound 

 Leaves are pinriate and pal- 

 mate. The pinnate leaf (Fig. 

 125) corresponds to the feath- 

 er-veined (penni-nerved) sim- 

 ple leaf. The palmate leaf 

 (I'ig. 126) corresponds to the 

 radiate- veined 



(palmi-nerved) u,Mta,^) -, i, sepa. a 



Frankincsnse-tree (Boa- 

 c. fr,, trans, sec. 



