522 CONSERVATIVE ORGANS. [LECT. X. 



larger than the other leaflets, the leaf is said to be 

 lyrato-pinnatum ; but this is a term of very rare 

 application in compound leaves ; those so deno- 

 minated being, for the most part., truly simple 

 lyrate leaves, altogether devoid of articulations, 

 or that modification of vessels at the union of the 

 lateral divisions, which is the requisite charac- 

 teristic of the leaflet, and consequently of the 

 compound leaf. If the leaflets be in opposite 

 pairs, and it be not essential to enumerate them, 

 the leaf is said to be oppositely pinnate (opposite 

 pinnatum) y 88 ; b.b. b. b. (page 521 ), and alternately 

 pinnate (alternatim pinnatum), when they are al- 

 ternate, QO, b. c. It is interruptedly pinnate (inter- 

 rupte pinnatum), when the leaflets are alternately 

 large and small on both sides of the petiole, 89, 

 b. c.b.c. ; jointedly pinnate (articulate pinnatum) , 

 when the common petiole is jointed betwixt each 

 pair of leaflets, .91 ; and decreasingly pinnate 

 (pinnatum foliolis decrescentibus), when the 

 leaflets gradually diminish in size from the base to 

 the apex of the leaf, as in Vicia sepium. In al- 

 most every writer on elementary Botany, the term 

 decurrently pinnate (decursive pinnatum) is de- 

 scribed as denoting that the leaflets are decurrent, 

 or united by a foliaceous membrane, extending 



count of the lateral leaflets, this term implying that all the 

 leaflets are on the apex of the petiole; I would, therefore, 

 propose the term impart '-conjugatum, for the above-mentioned 

 form of leaf. See cut, fig. 97, page 523, which is the leaf of 

 Hedysarum gyrans. 



