164 



and retuse at apex, ouneateor rounded at base and bearing on each side a glandular 

 callosity; inflorescence compact, the cluster 1 to 3 cm. long; cocci 1 or 2, 3 mm. in 

 diameter, borne on a slender stipe 2 mm. long; seed glabrous. 



Collected by Mr. C. G. Pringle on limestone hills near Tebuaean, altitude 5 000 

 feet, August 28, 1897 (No. 6691). 



Zanthoxylum nelsoni Rose, North Am. Fauna, No. 14 :79. 1899. 



Tree 7.5 to 20 meters high, thomless ( ?) ; leaves oddly pinnate; leaflets about 6 

 pairs, distaut, opposite, shortly petioled, 5 to 11 cm. (2 to H inches) long, rounded at 

 base, long-acuminate, crenate, glabrous on both sides, thickly set with pellucid dots; 

 inflorescence in small compact panicles; perianth complete; petals4{?); fruit large! 

 in dense headlike clusters, not stipitate. 



A very peculiar species, unlike any Mexican one known to me. ( 'ollectcd by E. YV. 

 Nelson on the Maria Madre Island, May 3 to 25, 1897 (No. 4279). 

 Zanthoxylum occidentale Kose, sp. nov. 



A large tree 7.5 meters high, with large rounded top ; branches with short straight 

 thorns, glabrous throughout; leaves 10 to 15 cm. long; leaflets 5 to 9, petiolulate, 

 cuneate at base, obtusely acuminate, 3 to 5 cm. long, glabrous on both sides, the 

 surface sprinkled with small pellucid dots, the margin undulate or crenate, the teeth 

 separated by large pellucid dots; inflorescence a short dense panicle. 



Apparently a common tree along the coast; seen both at Acaponetaand Kosario. 



Collected by J. N. Kose near Acaponeta, July 2 and 3, 1897 (No. 1519), and at 

 Kosario, July 22 (No. 1820). 



Zanthoxylum pterota (L.) II. B. K. Nov. Gen. et Sp. 6:3. 1826. Fagara pterota 



L. Syst. cd. 10, 897. 1759. 

 A large bushy shrub, 30 dm. high, with long, drooping branches. 

 Collected by J. N. Kose at Acaponeta, June 23, 1897 (No. 1442), and near Rosaiio 



July 10 (No. 1586). 



The following artificial key will serve to hold these Mexican and 

 Central American species together until those that are little known 

 have been re-collected and studied. 



KEY TO THE SPECTKS OF ZANTHOXYLUM. 



a. Leaven simple. 

 h. Plants thorny. 

 Z. pentanome DC. Prodr. 1 : 725. 1824. 



bb. Plants thomless. 

 Z. ghisbreghtii Tnroz. Hull. Soc. Nat. Mosc. 32, 1 : 274. 1859. 



aa. Leaves pinnate. • 



c. Rachis winged. 



Z. pterota (L.) II. 15. K. Nov. Gen. et Sp. 6:3. 1823. Vaqara pterota L. Svst e.l 

 10,897. 1759. ' " 



00. liaehis not winged. 



d. Leaflets 1 to S pairs (rarely 4 pairs). 



Z. limoncello Planch. & Oerst; Triana &, Planch. Ann. Sci. Nat. ser 5 14- 312 



1872. " ' " 



Z. melanostictum Schlecht. & Cham. Linmea, 5 : 231. 1830. 

 Z. arboresceus Rose, Contr. Nat. Herb. 5 : 112. 1897. 

 Z. longipes Kose, supra. 



Z. foetidum Rose, Contr. Nat. Herb. 5 : 112. 1897. 

 Z. occidentale Kose, supra. 



