THE LEAF 



97 



124^126. Pinnate leaves : the first with an odd leaflet 

 (odd-pinnate) ; the second with a tendril in 

 place of uppermost leaflets ; the third abruptly 

 pinnate, or of even pairs. 



179. Compound leaves are of two principal kinds, namely, the 

 pinnate and the palmate; answering to the two modes of veining in 

 reticulated leaves, and to the two sorts of lobed or divided leaves 

 (Figs. 116, 120). 



180. Pinnate leaves are those in which the leaflets are arranged on 

 the sides of a main 



leafstalk ; as in 

 Figs. 124-126. They 

 answer to (he feather- 

 veined (i.e. pinnately- 

 veinecT) simple leaf; 

 as will be seen at 

 once on comparing 

 the forms. The leaf- 

 lets of the former 

 answer to the lobes 

 or divisions of the 

 latter; and the con- 

 tinuation of the peti- 

 ole, along which the 

 leaflets are arranged, 

 that is, the leaf rachis answers to the midrib of the simple leaf. 



181. Three sorts of pinnate leaves are here given. Fig. 124 is pin- 

 nate with an odd or end lea/let, as in the Common Locust and the Ash. 

 Fig. 125 is pinnate with a tendril at the end, in place of the odd leaflet, 

 as in the Vetches and the Pea. Fig. 126 is evenly or abruptly pinnate, 

 as in the Honey Locust. 



182. Palmate (also named digitate} leaves are those in which the 

 leaflets are all borne on the tip of the leafstalk, as in the Lupine, 



the common Clover, the Virginia Creeper, 

 the Horse-chestnut and Buckeye (Fig. 127). 

 They evidently answer to the radiate veined 

 or palmately veined simple leaf. 



183. Either sort of compound leaf may 

 have any number of leaflets; yet palmate 

 leaves cannot well have a great many, since 

 they are all crowded together on the end 

 of the main leafstalk. Some Lupines have 

 nine or eleven ; the Horse-chestnut has 

 seven, the Sweet Buckeye more commonly 

 five, the Clover three. A pinnate leaf often 

 has only seven or five leaflets, or only three, 

 as in the Beans of the genus Phaseolus, etc. ; in some rarer cases only 

 two; in the Orange and Lemon and also in the common Barberry 

 there is only one. The joint at the place where the leaflet is united 



OUT. OP HOT. 7 



127. Palmate (or digitate) 

 leaf of five leaflets 

 of the Sweet Buck- 

 eye. 



