94 



ACADEMIC BOTANY. 



simple leaf. 



Flo. 126.— Ohaste-tres {VUexAgnm- 

 CastuB), with sepa. fr. 



Odd -pinnate [impari-pm- 

 nate), with a leaflet at the 

 apex ; Locust, Boswellia 

 (Fig. 125) ; Interrupted- 

 pinnate, interrupted by 

 small intervening leaflets ; 

 Agrimony (Fig. 129) ; Bi- 

 pinnate when the leaves 

 are still further corn- 

 pounded by branching 

 once ; Mimosa (Fig. 130) ; 

 here the branches are 

 called pinnce (L. pinna, 

 feather); Tri-pinnate, 

 when thrice - branched ; 

 the last branches called 

 pinnules {h. pinnulce) ; 

 Venus' Maiden-hair Fern. 

 The Mimosas furnish ele- 

 gant examples of bi-pin- 

 nate forms. The Silk- 

 flower-tree so common in 



The part of the common petiole to which the 

 leaflets of a pinnate leaf are at- 

 tached is called the rachis (Gr. 

 spine). Palmate leaves have no 

 rachis ; each leaflet is jointed to 

 the common petiole at a common 

 point. Sometimes in the pinnate 

 leaf each leaflet has a petiole ; this 

 is called a petiolule; if it has a 

 stipule, this is called a stipel. 



198. Pinnate Leaves. The 

 most reduced pinnate leaf is that 

 ofthe Lemon (Fig. 127). Though 

 one-leaved, it is jointed to the pe- 

 tiole, a character never found in 

 the simple leaf. 



199. Pinnate leaves are : Unifoliolate ; 

 Lemon (Fig. 127) ; Bifoliolate, Binate; 

 Bignonia ; Trifoliolate, Ternate ; Dew- 

 berry (Fig. 131) ; Multifoliolate ; Wis- 

 taria, Locust ; Even-pinnate (pari-pin^ 

 nate when the leaflets are in pairs with 

 no end-leaflet), Guaiaoum (Fig. 128) ; 



Fia. 127. — Lemon {Citrua Limonum). 



Southern gardens has a leaf with 10 to 18 pairs of pinnaj and 24 to 30 



