NOMENCLATURE OF THE LEAF. 71 



JointeiUy-pinnated when the common leaf-stalk is joined be- 

 tween each pair of leaflets, as in the weimannia-pinnata. 



Decreasingly-pinnate when the leaflets gradually diminish 

 in size from the base and the apex of the leaf , as in the bush-vetch. 

 Verticillato-pinnate when the leaflets, instead of being 

 arranged in the same plane on each side of the common leaf- 

 stalk, are placed around it. 



i. Vertebrated consisting of several leaflets, which appear to 

 grow out of each other, or are attached one upon the summit of 

 another, with an evident joint at the point of attachment, as in the 

 prickly-leaved fagara. (F. 147.) . 



27. Doubly Compound : The double compound leaves 

 are those, in which the common leaf-stalk is divided into, 

 or supports secondary foot-stalks. (F.39.) The varieties 

 are, the bigeminate, tergeminate, biternate, bipinnate, 

 conjugato-pinnate, ternato-pinnate, and digitato-pinnate. 



a. Bigeminate or twice-paired when near the apex of the com- 

 mon leaf-stalk, there is a single pair of secondary leaf-stalks, each of 

 which, supports a pair of opposite leaflets, as in the four-leaved 

 juga-tree. (F. 167.) 



b. Tergeminate when the leaf resembles the bigeminate in its 

 foot-stalk divisions, and has besides, a third pair of leaflets at the 

 point where the secondary leaf-stalks originate, as in the mimosa 

 tergemina. (F. 168.) 



c. Biternate when the common foot-stalk supports three se- 

 condary leaf-stalks on its apex, and each of these support three 

 leaflets, as in the Alpine barren-worU- (F. 171 and 36.) 



d. Bipinnate when the secondary leaf-stalks are arranged in 

 pairs on the common leaf-stalk, and each secondary leaf-stalk is pin- 

 nate, or displays the characters of the simple pinnate leaf. (F. 169.) 



e. Conjugato-pinnate when a common leaf-stalk supports a sin- 

 gle pair of secondary leaf-stalks, each of which is pinnate, as in 

 soldier's-bush juga-tree. (F. 170.) 



f. Ternato-pinnate when the common leaf-stalk supports, on its 

 apex, three pinnate leaflets, as in the hoffmanseggia. 



g. Digitato-pinnate when there are more than three, as in the 

 humble-plant. 



