STANDLEY TREES AND SHRUBS OF MEXICO. 395 



Veracruz, the type from Colipa. Central America. 



Tree, sometime 8 meters high ; pinnae 1 pair, the leaflets 1 pair, lanceolate 

 or narrowly oblong, usually 8 to 11 cm. long, thick, lustrous, glabrous. " Soto 

 caballo" (Costa Rica). 



8. Pithecollobium guadalupense (Pers.) Chapm. Fl. South. U. S. 116. 1860. 

 Mimosa guadQlnpensis Pers. Syn. PI. 2: 262. 1807. 



Yucata,n. West Indies and Florida Keys ; type from Guadeloupe. 



Unarmed shrub or tree, sometimes 6 meters high, with a trunk 15 cm. in 

 diameter, the bark dark gray, slightly fissured ; leaves persistent, the 4 leaflets 

 obliquely obovate to suborbicular, 4 to 7 cm. long, lustrous; flowers pink; 

 fruit compressed, 10 to 15 cm. long, dark brown, twisted ; seeds black, with a 

 red aril. 



The writer has seen no material from the Lesser Antilles, and does not feel 

 certain that the name here used really applies to the present plant. The 

 Yucatan specimens, however, are of the same species as the Cuban plant to 

 which the name is now applied. 



9. Pithecollobium revolutum Rose, Contr. U. S. Nat. Herb. 10: 96. pi. 28. 1906. 

 Known only from the type locality, near Higuerillas, Queretaro. 



Low dense shrub ; leaflets 6 to 10, about 3 mm. long ; fruit flat, curved, 5 to 7 

 em. long, pubescent. 



10. Pithecollobium elastichophyllum A. Gray; S. Wats. Proc. Amer. Acad. 17: 

 352. 1882. 



Coahuila, Nuevo Le6n, and San Luis Potosf; type from Monterrey. 



Low spiny shrub with very stiff interlaced branches ; leaflets few, 3 to 4 mm. 

 long, coriaceous; flowers reddish, the heads nearly sessile; fruit flat, 1.5 cm. 

 wide, curved, puberulent. 



11. Pithecollobium compactum Rose, Contr. U. S. Nat. Herb. 8: 33. 1903. 

 Pithecollobium purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 85. 1919. 

 Puebla ; type from Tehuac^n. 



Low shrub, usually 30 to 50 cm. high, compact, very spiny ; leaflets 5 to 7 

 pairs, 3 to 4 mm. long, lustrous ; flowers greenish, tinged with red, subcapitate ; 

 fruit curved, compressed, 1.2 cm. wide, puberulent ; seeds brownish black. 



12. Pithecollobium acatlense Benth. Trans. Linn. Soc. Bot. 30: 593. 1875. 

 Durango to Puebla and Oaxaca ; type from Acatl5,n, Puebla. 



Shrub or small tree, 3 to 4.5 meters high ; pinnae 2 or 3 pairs, the leaflets 

 rather numerous, 6 to 10 mm. long, obtuse or acute, pubescent or glabrate; 

 flowers capitate, the heads nearly sessile; fruit flat, straight, about 14 cm. 

 long and 2.5 cm. wide, densely pubescent. 



13. Pithecollobium leiocalyx Standi. Contr. U. S. Nat. Herb. 20: 189. 1919. 

 Known only from the type locality, Salina Cruz, Oaxaca. 



Leaflets 6 to 14 mm. long, obliquely oval or obovate, pubescent. 



14. Pitchecollobium arboreum (L.) Urban, Symb. Antill. 2: 259. 1900. 

 Mimosa arhorea L. Sp. PI. 519. 1753. 



Pithecollobium filicifolium Benth. Lond. Journ. Bot. 3: 205. 1844. 



Samanea arhorea Ricker in Bailey. Stand. Cycl. Hort. 3066. 1917. 



Veracruz and Oaxaca. West Indies and Central America ; type from 

 Jamaica. 



Tree, sometimes 4 meters high, with a trunk a meter in diameter, the bark 

 thick, gray, very rough ; leaves large, often 40 cm. long, bright green, glabrate, 

 with numerous pinnae and leaflets, the latter linear. 12 to 15 mm. long; 

 flowers white; fruit subterete, constricted, bright red, puberulent. twisted 

 after dehiscence, blood-red within ; see<ls black ; wood hard, fine-grained, taking 



