STANDLEY TREES AND SHRUBS OF MEXICO. 367 : 



Leaflets large, most of them 0.8 to 3 era. wide, comparatively few. 

 Mature fruit 2.5 to 4.5 cm. wide. 



Leaflets 6 to 8 pairs; pinnae 3 to 6 pairs 1. L. plurijuga. 



Leaflets 2 to 4 pairs; pinnae 2 or 3 pairs. 



Leaflets lance-ovate, 1.5 to 2.3 cm. wide ; fruit 2.5 to 3 cm. wide. 



2. I*, macrophylla. 

 Leaflets broadly ovate or oval, most of them 2.5 to 3.5 cm. wide; fruit 



3.5 to 4.5 cm. wide 3. L. macrocarpa. 



Mature fruit less than 2 cm. wide. 



Leaflets lance-oblong or oblong-ovate, 0.8 to 1.3 cm. wide-._4. L. lanceolata. 

 Leaflets oval or rounded-oval, most of them 1.5 to 3.5 cm. wide or larger. 



5. L. microcarpa. 

 Leaflets small, 1 to 8 mm. wide, numerous. 



Young branches sharply angulate 6. L, esculenta. 



Young branches terete. 

 Corolla glabrous. 



Leaflets 6 mm. long or shorter. 



Leaflets thin, linear-oblong, the venation plane, rounded or obtuse at 



apex 7. L. diversifolia. 



Leaflets coriaceous, oval-oblong or broadly oblong, "the venation promi- 

 nent beneath, cuspidate at apex 8. L. cuspidata™ 



Leaflets 10 mm. long or longer. 



Leaflets oblong, obtuse or rounded at aiiex, 3 to S nun. wide; fruit 



puberulent 9. L. shannoni. 



Leaflets narrowly lance-oblong, acute, 2.5 to 4 mm. wide ; fruit glabrous. 



10. L. glabrata. 

 Oorolla pubescent. 



Limb of the corolla pilose with spreading yellow hairs ; beak of the fruit 



1.5 to 3.5 cm. long 11. L. greggii. 



Limb of the corolla pilose with minute appressed hairs ; beak of the fruit 

 less than 1 cm. long. 



Corolla 3 to 4 times as long as the calyx 12. L. pulvenilenta. 



Corolla about twice as long as the calyx. 



Leaflets 7 to 15 mm. long 13. L. glauca. 



Leaflets 2 to 5 mm. long. 

 Leaflets glabrous on the faces, the eosta impressed beneath. 



14. I/, brachycarpa. 

 Leaflets densely pilose on both surfaces with minute, mostly spread- 

 ing hairs, the costa prominent beneath 15. L. stenocarpa. 



1. Leucaena plurijuga Standi. Contr. U. S. Nat. Herb. 20:189. 1919. 

 Queretaro, Guanajuato, and Michoacan ; type from Monte Leon, Michoacan. 

 Leaflets oblong or oval, 2 to 3 cm, long, rounded at apex, nearly glabrous ; fruit 



about 24 cm. long. 



2. Leucaena macrophylla Benth. Bot. Voy. Sulfih. 90. 1844. 



Colima to Guerrero ; type from Acapulco, Guerrero. Reported from Panama. 

 Small tree, about 3.5 meters high ; leaflets 5 to 6.5 cm. long, acute, pubescent 

 beneath when young, glabrate in age ; fruit about 20 cm. long. 



3. Leucaena macrocarpa Rose, Contr. U. S. Nat. Herb. 1: 327. f. 6. 1895. 

 Tepic to Colima ; type from Rfo Blanco, Jalisco. 



Shrub or small tree, sometimes 7.5 meters high ; leaflets 4 to 9 cm. long, acute 

 or obtuse, bright green, nearly glabrous; flower heads 1 cm. in diameter, race- 

 mose. 



