36 



ORGANOGRAPHY. 



leaves. The pinnate leaves have the leaflets or pinnae 

 arranged on each side of the rachis. If the leaflets are in 



pairs throughout, the leaf is said to be abrtiptly-pinnate 

 (Fig. 74) ; if a single leaflet terminates the rachis, the leaf 

 is said to be odd-pinnate (Fig. 73). Palmate (some- 

 times called digitate) leaves have the leaflets borne on 

 the extreme tip of the leaf-stalk (Fig. 75). 



42. The leaflets themselves may be divided, which is 

 expressed by the terms bi-pinnate (twice pinnate, Fig. 

 76), or thrice pinnate. When the leaf is several times 

 compound, it is called de-compound. 

 Of numerous other forms not yet men- 

 tioned, the following 

 are conspicuous. Per- 

 foliate (Lat. per, 

 through ; folium, leaf), 

 in which the stem ap- 

 pears to pass through 



the leaf near its base 



77, 



Fitr. 74. An Abruptly-pinnate leaf. Fig. 7.^. A Palmate (or Digitate) leaf. Fig, 

 76. A Bi-piiinale leaf. Fig. 77. A Perfollaii; leaf. 



