182 Trans. Acad. Sci. of St. Louis. 



ILICEAE. 



Ilex. 



7. Ilex rigida, sp. nov. (Plate XIV. fig. 2). 



Leaves coriaceous, short-petioled, oblong; margin irreg- 

 ularly and acutely dentate; teeth beset with sharp spines; 

 primary nerve very prominent; secondary nerves nearly 

 straight, camptodrome ; veinlets obscure. 



The leaf is unlike those described by Lesquereux. It is 

 about seven centimeters long and nearly two centimeters 

 broad. The petiole is thick and short. The teeth are very 

 sharp and larger in the middle of the leaf than at the ends ; 

 in some cases the spines can be distinctly seen. The midrib 

 is the most conspicuous, and in the living species must have 

 been very prominent and strong, giving rigidity to the leaf. 

 The secondary nerves are firm and alternating, and branch out 

 nearly at right angles from the primary. This species shows 

 the main characteristics of the Iliceae. It differs from the 

 known species in its oblong form and in the long and sharply 

 pointed spines which project out nearly at right angles from 

 the margin of the leaf. 



RHAMNACEAE. 



ZlZYPHUS. 



8. Zizyphus obtusa, sp. nov. (Plate XIII. fig. 1). 



Leaf simple, small, subcoriaceous, ovate, somewhat un- 

 equal, triple-nerved; margin evenly serrated, the teeth fine 

 and sharp, and smaller toward the apex; base round; apex 

 obtusely pointed; petiole short and rather thick; basal nerves 

 strong. 



This leaf, although rather small, presents the character- 

 istic nervation of the genus. The blade is 2 centimeters 

 long and 1.3 centimeters broad. The middle nerve is thick 

 and runs straight to the apex. The lateral, diverging at an 

 angle of about 35°, curve gently along the margin. The sec- 

 ondary nerves which branch from the middle nerve diverge 

 at a greater angle and anastomose in simple bows; those of 



