RUTACEA. 171 
Frutex vel arbor parva, dense ramosa, glaberrima. Folia petiolata, subopposita, trifoliolata (vel 
interdum bifoliolata, foliolum alterum integrum alterum basi unilobatum), foliolis sessilibus 
subcoriaceis, lanceolatis, obtusis vel interdum retusis, intermedio ad sesquipollicari, lateralibus 
duplo triplo quadruplove brevioribus, creberrime precipue subtus nigro punctatis, supra nitidis. 
Flores minutissimi, tetrameri, breviter pedicellati, in cymas parvas terminales dispositi. Fructus 
(unicus tantum visus) obovato-ellipticus, basi auriculatus. 
Norra Mexico, near Carrizal, Nuevo Leon (Berlandier, 1404), Buen Vista (Gregg). 
Hb. Kew. 
8. Ptelea pentandra, DC. Prodr. ii. p. 83; Calques des Dess. Fl. Mex. 201. 
Soura Mexico, Guanaxuato (Hartweg), without locality (Mogino & Sessé). Hb. Kew. 
4, Ptelea podocarpa, DC. Prodr. ii. p. 83; Calques des Dess. Fl, Mex. 200. 
Mexico, without locality (Mogino & Sessé). 
5. Ptelea trifoliata, Linn. Sp. Pl. p. 178. 
Southern States of Norra America, from Kentucky to—Nortu Mexico, Fronteras, 
Sonora. ( Torrey). 
6. Ptelea, sp. 
Soura Mexico, Cordillera of Oaxaca, 6000 feet (Galeotti, 7169). Hb. Kew. 
12. CASIMIROA. 
Casimiroa, Llave et Lex. Nov. Veg. Descr. fase. ii. p. 2; Benth. et Hook. Gen. Plant. i. p. 302. 
Limited to the two arboreous species here enumerated. . 
1. Gasimiroa edulis, Llave et Lex. Nov. Veg. Descr. ii. p. 2; Seem. Bot. Voy. 
‘Herald,’ p. 273, t. 51 & 52. 
Zanthoxylon araliaceum, Turcz. 
Norra Mexico, frequent in the States of Cinaloa and Durango, both wild and cul- 
tivated (Seemann, 2137); Sour Mexico, Zimapan (Coulter, 787), Orizaba (Botteri, 
1008); Guaremata, near the city of Guatemala (S. Hayes). Hb. Kew. 
9. Casimiroa sapota, CErst. in Vidensk. Meddel. 1857. 
Nicaragua, Province of Segovia, in the vicinity of Chinotega, at 4000 feet.( Ersted). 
Tribe AURANTIE. 
With the exception of the doubtful genus Stawranthus, this tribe (comprising twelve 
genera and above sixty species) is limited to the Old World. 
13. STAURANTHUS. 
Stauranthus, Liebm. in Vidensk, Meddel. 1853, p. 91; Benth. et Hook. Gen. Plant. i. p. 303. 
‘The only species :— 
22 
