THE LEAF 



97 



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. 



the sides of a main 



J2 



Pinnate leaves are those in which the leaflets are arranged on 



12-^-126. Piunate leaves : the first with an odd leaflet 

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

 place of uppermost leaflets ; the third abruptly 

 jjinnate, or of even pairs. 



leafstalk ; as in 

 Figs. 124-126. They 

 answer to i\\e feather- 

 veined (i.e. pinnateli/- 

 veined) simple leaf ; 

 as wdll 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. 12-1 is pin- 

 nate ivith an odd or end leaflet, as in the Common Locust and the Ash. 

 Fig. 125 is pinnate ivith 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 liave 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. OF BOX. 7 



127. Palmate (or digitate) 

 leaf of five leaflets 

 of the Sweet Buck- 

 eye. 



