282 MEXICO. [Zanthoxylea. 



botanical character hitherto given seems to be derived almost entirely from figures, these tubercles are the 

 prickles mentioned by authors ; though we have no doubt but similar ones may be observed on most species 

 of the genus. 



1. Paullinia fuscescens ; foliis biternatis, petiolo tereti, petiolulis anguste alatis, foliolis 

 oblongis omnibus acutis vel obtusiusculis grosse crenato-serratis basi cuneato-attenuatis 

 supra in nervo venisque hirtis alioquin puberulis subtus molliter tomentoso-hirtis aureo- 

 fuscescentibus, capsulis globoso-pyriformibus tomentosis adultis glabrescentibus, valvis 



sursum carinato-alatis P. fuscescens. H. B. K. Nov. Gen. 5. p. 120? — P. pubescens. 



De Cand. I. p. 606? — Hab. Acapulco. 



Our specimens appear only to differ from Humboldt's by the shape of their leaflets. They seem also very 

 closely allied to P. velutina, De Cand. (which probably does not differ from P. mollis, H. B. K.), but that 

 has the petioles not margined. 



1. Dodonaea viscosa. Linn. 

 The specimen in the collection appears to belong to the var. « of Kunth Syn. 3. p. 168. 



Ord. XXI. AMPELIDEiE. De Cand. 

 1. Cissus 



The specimen is extremely mutilated : the leaves or leaflets (for they are lying loose on the sheet without 

 any petiole by which we might conjecture whether they were simple or compound) are oblong-lanceolate, 

 acuminated, glabrous, fleshy, and sharply toothed. 



Ord. XXII. ZYGOPHYLLEiE. Br. 



1. Kallstrcemia maxima Tribulus maximus. Linn. — Hab. Acapulco. 



Ehrenbergia tribuloides of Martius is another species, and seems to differ from the more common one by 

 having the carpels crested at the back, and the colour of the flowers. Here the carpels are slightly muricated 

 and wrinkled. Tribulus trijugatus of Nuttall is probably the same species ; he, no doubt, attributes to it five one- 

 seeded carpels, but as there is little doubt that his plant and the Trib. maximus of Elliott are' identical, we 

 learn from Elliott that there are ten seeds ; and although Elliott hesitates about his being the true T. maximus, 

 his description accords in every particular both with the West Indian and Mexican species. 



Ord. XXIII. ZANTHOXYLEvE. Adr. de Juss. 

 1. Zanthoxylon Pterota. H. B. K. ? at forsan Schlecht. in I Ann. 6. p. 426. 



In our plant the leaflets are from four to eight pairs, about 12 or 14 lines long and 4-6 broad : the petiole 

 and rachis have no prickles. In a plant allied to, or a variety of this, from Texas (Drummond, Tex. III. 

 n. 68), the petiole is likewise unarmed, but the leaflets are much smaller, scarcely more than 4 or 5 lines 

 long, and are obovate. The only prickles in both are in pairs at the base of the petioles, and are more or 

 less curved. 



A specimen of Zanth. piperitum is also in the Mexican collection, but we presume that it had been acci- 

 dentally transferred from that made at Loo Choo and Bonin. 



1. Bruoellia? quadrilocularis ; glabra inermis, foliis oppositis sublonge petiolatis late 



