536 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



Leaves simple, the petioles not jointed. 



Fruit about 2 cm. broad; petioles 1 to 12 mm. long 1. E. hartmanii. 



Fruit 3 to 4 cm. broad ; petioles 10 to 35 mm. long 2. E. flava. 



Leaves compound, with 3 or 5 leaflets. 



Leaflets densely pubescent beneath 3. E. macrantha. 



Leaflets glabrous beneath or nearly so. 



Inflorescence racemose, few-flowered ; leaves short-petiolate, the glands 



large and conspicuous 4. E. collina. 



Inflorescence paniculate; leaves long-petiolate, with small inconspicuous 

 glands. 

 Sepals puberulent outside; flowers 6 to 8 mm. broad__5. E. pentaphylla. 

 Sepals glabrous outside; flowers 5 to 5.5 cm. broad 6. E. berlandieri. 



1. Esenbeckia hartmanii Robins. & Fern. Proc. Amer. Acad. 30: 115. 1894. 

 Sonora and Sinaloa ; type from La Tiuaja, Sonora. 



Shrub, 2 to 3 meters high, with thick stifl' branches ; leaves oblong to oval, 

 entire, 2 to 8 cm. long, rounded or retuse at apex, pubescent beneath. 



2. Esenbeckia flava T. S. Brandeg. Zoe 1 : 378. 1891. 

 Southern Baja California ; type from San Jos6 del Cabo. 



Shrub or small tree, sometimes 9 meters high, with a trunk 20 cm. in diam- 

 eter ; leaves oblong or oval, 5 to 14 cm. long, pubescent beneath ; flowers white, 

 1.4 cm. broad ; fruit covered with spinelike projections ; wood yellow. " Palo 

 amarillo." 



3. Esenbeckia macrantha Rose, Contr. U. S. Nat. Herb. 5 : 111. 1897. 

 Oaxaca and Puebla ; type collected near Dominguillo, Oaxaca. 



Tree, 4 to 6 meters high ; leaflets 3, 15 to 20 cm. long, obtuse or short- 

 acuminate ; flowers white, 8 to 10 mm. broad ; fruit 3 cm. broad. 



4. Esenbeckia collina T. S. Brandeg. Univ. Calif. Publ. Bot. 6:183. 1915. 

 Known only from the type locality, Cerro del Picacho, Oaxaca. 

 Leaflets 3, 3 to 5 cm. long, rounded or retuse at apex. 



5. Zanthoxylum fagara (L.) Sarg. Card. & For. 3: 186. 1890. 

 Galipea pentaphylla Macfad. Fl. Jam.l: 196. 1837. 

 Yucatan. Jamaica (type locality). 



Tree, sometimes 15 meters high, with brownish or grayish bark; leaflets 

 usually 5, 6 to 17 cm. long; flowers yellowish white. " Yax-hocob " (Yucatdn, 

 Maya). 



The plant of Yucatan may not be distinct from E. berlandieri. 



6. Esenbeckia berlandieri Baill. Adansonia 10: 151. 1871. 

 Esenbeckia acapulccnsis Rose, Contr. U. S. Nat. Herb. 5 : 111. 1897. 

 Esenbeckia ovata T. S. Brandeg. Univ. Calif. Publ. Bot. 7: 327. 1920. 

 Guerrero, Tamaulipas, San Luis Potosi, and Veracruz; type from Tampico, 



Tamaulipas. 



Tree, 4.5 to 6 meters high, with a trunk 7 to 12 cm. in diameter ; leaflets 

 3 or 5, dark green, 4 to 17 cm. long, rounded at apex. "Jopoy" (Tamaulipas, 

 Palmer). 



14. PELTOSTIGMA Walp. Repert. Bot. 5: 386. 1846. 



1. Peltostigma pteleoides (Hook.) Walp. Repert. Bot. 5: 387. 1846. 



Pachystiyma pteleoides Hook. Icon. PI. pi. 698, 699. 1844. 



Hidalgo and probably elsewhere. Central America; Jamaica (type locality). 



Tree, 5 to 8 meters high ; leaves alternate, digitately 3 or 5-foliolate, the 

 leaflets 5 to 20 cm. long, acute or acuminate, bright green, glabrate, entire or 

 nearly so ; flowers white, fragrant, 3 to 5.5 cm. broad ; fruit of 6 to 10 largo 

 hard carpels. 



