STANDLEY — TREES AND SHRUBS OF MEXICO. 529 



Leaflets 3 or more. 

 Leaves opposite. 

 Leaflets usually 7 to 11, sometimes 5, densely puberulent beneath. 



3. A. madrensis. 

 Leaflets 3 or 5, glabrous beneath or nearly so. 

 Lateral leaflets subcordate at base, rounded at apex, pale beneath. 



4. A. purpusi. 

 Lateral leaflets obtuse at base, acuminate at apex, green beneath. 



5. A. balsamifera. 

 Leaves alternate. 

 Leaflets 1 to 3 cnj. long, 0.5 to 1.5 cm. wide, the terminal one short-stalked. 



6. A. texana. 

 Leaflets 3 to 10 cm. long, 2 to 9 cm. wide, the terminal one long-stalked. 

 Petioles not winged ; leaflets acute, ovate or rhombic-ovate. 



7. A. sylvatica. 

 Petioles usually winged ; leaflets acuminate, elliptic to rhombic-lanceolate. 



8. A. thyrsiflora. 



1. Amyris monophylla T. S. Brandeg. Univ. Calif. Publ. Bot. 3: 381. 1909. 

 Oaxaca and Puebla ; type from San Luis Tultitlanapa, Puebla. 



Glabrous shrub ; leaflet ovate to oval, 2.5 to 5 cm. long, rounded or obtuse 

 at apex, coriaceous, entire or nearly so. 



2. Amyris rekoi Blake, Contr. Gray Herb. n. ser. 53: 56. 1918. 



Tepic and Oaxaca ; type from Cafetal Nueva Esperanza, Department of 

 Pochutla, Oaxaca, altitude 700 meters. 



Glabrous tree or shrub ; leaflet lance-ovate to oblong-ovate, 6.5 to 11.5 cm. 

 long, acuminate; fruit bluish black, 5 mm. in diameter. 



3. Amyris madrensis S. Wats. Proc. Amer. Acad. 25: 144. 1890. 



Nuevo Leon and San Luis Potosi; type from mountains near Monterrey, 

 Nuevo Leon. Southwestern Texas. 



Very leafy shrub ; leaflets rhombic, 1.5 to 3 cm. long, coriaceous, entire or 

 crenate; fruit 10 to 12 mm. long. 



4. Amyris purpusi P. Wilson, Bull. Torrey Club 37: 86. 1910. 

 Known only from the type locality, Zacuapan, Veracruz. 



Small tree; leaflets 3, oval or ovate, 2 to 4 cm. long, entire or nearly so. 



5. Amyris balsamifera L. Syst. Nat. ed. 10. 1000. 1759. 



Sinaloa to Guerrero. West Indies, South America, and southern Florida ; 

 type from Jamaica. 



Shrub or tree, sometimes 7 meters high, with a trunk 20 cm. in diameter ; 

 leaflets 3 or 5, 5 to 13 cm. long, entire or creuulate; flowers white; fruit obovoid 

 or elliptic, 6 to 13 mm. long, bluish black, aromatic ; wood hard, close-grained, 

 orange, very resinous, its specific gravity about 1.04. " Limoncillo " (Sinaloa). 



The Mexican material may represent a distinct species, but the material at 

 hand is too incomplete to determine this point. 



6. Amyris texana (Buckl.) P. Wilson, Torreya 8: 139. 1908. 

 Zanthoxylum texanum Buckl. Bull. Torrey Club 10: 90. 1883. 

 Amyris parvifolia A. Gray, Proc. Amer. Acad. 23 : 226. 1888. 

 Nuevo Leon. Western Texas ; type from Corpus Christi. 



Glabrous aromatic shrub, 1 to 2 meters high, leaflets 3, ovate, obtuse. 

 "Chapotillo" (Nuevo Leon). 

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