426 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



prominent venation beneath, paler beneath, short-petiolulate, eglandular ; ra- 

 cemes terminal, few-flowered ; pedicels finely puberulent and furnished with 

 scattered short-stipitate glands ; sepals about 7 mm. long, puberulent and 

 glandular, glandular-ciliate; petals only slightly exceeding the sepals; fruit 

 flat, elastically dehiscent, 2.5 cm. long, 1.3 cm. wide, glabrous but with a few 

 scattered dark glands. 



17. Caesalpinia gaumeri Greenm. Field Mus. Bot. 2: 330. 1912. 

 Yucatan ; type from Progreso. 



Tree, 15 to 20 meters high, unarmed; leaflets 2 to 3 cm. long, glabrate; 

 flowers yellow, in long racemes. " Xcitinche." 



18. Caesalpinia caladenia Standi. Contr. U. S. Nat. Herb. 20: 214. 1919. 

 Sonora to Colima ; type collected below Minas Nuevas, Sonora. 



Unarmed shrub ; leaflets oval, 1 to 3 cm. long, glabrous ; flowers large, yellow ; 

 fruit flat, about 7 cm. long and 1.5 cm. wide, straight or falcate, bearing numer- 

 ous small- reddish glands. 



19. Caesalpinia acapulcensis Standi. Contr. U. S. Nat. Herb. 20: 213. 1919. 

 Known only from Acapulco, Guerrero, the type locality. 



Unarmed shrub; leaflets 2.5 to 4 cm. long, rounded at apex, glabrous, pale 

 beneath ; fruit 7 cm. long, 1.7 cm. wide, puberulent. 



20. Caesalpinia calif omica (A. Gray) Standi. 



Caesalpinia mexicana calif oniica A. Gray, Proc. Amer. Acad. 5: 157. 1862. 



Poinciana calif omica Rose, Contr. U. S. Nat. Herb. 13: 303. 1911. 



Baja California. 



Unarmed shrub, 1 to 4.5 meters high ; leaflets few, oval, 1 to 2 cm. long, glab- 

 rous; flowers yellow; fruit about 4.5 cm. long and 1.3 cm. wide, velvety- 

 puberulent. 



Perhaps not essentially different from C. pannosa. 



21. Caesalpinia palmeri S. "Wats. Proc. Amer. Acad. 24: 47. 1889. 

 Poinciana palmeri Rose, Contr. U. S. Nat. Herb. 13: 303. 1911. 

 Baja California, Sonora, and Sinaloa ; type from Guaymas, Sonora. 



Shrub or small tree, 1 to 4.5 meters high ; leaflets 4 to 15 mm. long, usually 

 glabrous but sometimes piibescent; calyx pubescent; flowers yellow, in very 

 short racemes; fruit about 5.5 cm. long and 1.5 cm. wide, velvety-puberulent, 

 tinged with purple. 



22. Caesalpinia mexicana A. Gray, Proc. Amer. Acad. 5: 157. 1862. 

 Caesalpinia mexicana pvbcscens Robins. & Greenm. Proc. Amer. Acad. 29: 



386. 1894. 



Poinciana mexicana Rose, Contr. U. S. Nat. Herb. 13: 303. 1911. 



Sinaloa to Tamaulipas and Guerrero ; type from Nuevo Le6n. 



Unarmed shrub or small tree, 1.5 to 6 meters high; leaflets oblong to 

 soborbicular, 1 to 2.5 cm. long; flowers rather large, yellow, in very long 

 racemes; fruit flat, about 6 cm. long and 1.5 cm. wide. " Retamilla " (Nuevo 

 Le6n) ; " tabachin del monte " (Tamaulipas). 



A rather variable species; calyx usually glabrous but sometimes pubescent. 

 The form found on the Pacific Coast diflers slightly from the more eastern one ; 

 Intermediate forms occur also. Here probably belong sterile specimens of a 

 Oaxaca tree known as " 6bano " and " guayavillo." 



23. Caesalpinia exostemma DC. Prodr. 2: 483. 1825. 

 Poinciana conzattii Rose. Contr. U. S. Nat. Herb. 13: 303. 1911. 



Oaxaca; also reported to range from .Jalisco to Chiapas. Guatemala to 

 Nicaragua. 



Small tree, 3 to 4.5 meters high, unarmed; leaflets oblong to oval, 1 to 3 

 cm. lonK. pubescent or glabrate; flowers large and showy, yellow; fruit 8 to 



