364 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Shrub or small tree, sometimes 6 meters high ; leaflets 4 to 6 mm. loug ; 

 flowers white; fruit broad, thin, sparsely hispid on the valves. "Rabo de 

 iguana" (Guerrero); " uiia de gato " (Oaxaca). 



It is possible that M. curycarpoidcs is distinct, but it is known only from 

 flowering branches, which show no essential differences from M. eurycarpa. 

 The fruit originally described as belonging to M. eurycarpoides is probably that 

 of Acacia farnesiana. 



51. Mimosa colimensis Robinson, Proc. Bost. Soc. Nat. Hist. 31: 358. 1904. 

 Known only from Colima, the type locality. 



Shrub, armed with short recurved spines ; leaflets 5 to 7 mm. long ; flower 

 heads racemose-paniculate. 



It is doubtful whetlier this is distinct from M. eurycarpa. The fruit is not 

 known. 



52. Mimosa malacophylla A. Gray, Journ. Bost. Soc. Nat. Hist. 6: 182. 18.50. 

 Chihuahua and Coahuila to Tamaulipas. Western Texas; type collected on 



the Rio Grande. 



Scaudent or recumbent shrub, 3 to 4.5 meters high, armed with numerous 

 small recurved spines ; leaflets mostly oval, 7 to 14 mm. long, obtuse or acute ; 

 flowers white, sweet-scented ; fruit 5 to 7.5 cm. long, 1 cm. wide, glabrous. 

 " Raspa-huevos " (Nuevo Leon, Tamaulipas) ; " raspilla " (Tamaulipas). 



53. Mimosa wootonii ' Standi., sp. nov. 



Type from Hacienda Buena Vista, Tamaulipas (Wooton, June 14, 1919; 

 U. S. Nat. Herb. no. 989828). 



Subscandent shrub, the branches angulate, glabrous, armed with very nu- 

 merous short recurved prickles; leaf rachis 9 to 12 cm. long, with numerous 

 recurved prickles, sparsely puberulent with short curled hairs; pinnae 3 or 

 4 pairs; leaflets usually 4 or 5 pairs, oval-elliptic, oval, or sometimes obovate- 

 oval, 8 to 15 mm. long, 5 to 9 mm. wide, acute or obtuse at apex, mucronate, 

 bright green, glabrous, with rather prominent venation ; flowers capitate, race- 

 mose, the peduncles fasciculate, 1.2 to 2 cm. long, puberulent ; calyx and corolla 

 glabrous, the calyx one-third as long as the corolla ; ovary glabrous. " Ras- 

 pilla," " raspa-huevos." 



Except in pubescence, this plant is almost exactly like M. malacophylla 

 Gray, which was collected at the same locality. It may be only a form of 

 that species, but in the latter the pubescence is very copious on all parts, 

 consisting of short straight hairs. The quality and quantity of pubescence seem 

 to be constant characters in the other Mexican species of the genus. 



54. Mimosa zygophylla Benth. ; A. Gray, PI. AVright. 1 : 61. 1852. 

 Coahuila, Nuevo Leon, San Luis Potosi, and Zacatecas ; type from the re- 

 gion of Saltillo. 



Densely branched shrub, 0.3 to 1 meter high or larger, armed with short stout 

 recurved spines ; leaflets about 3 mm. long ; flowers pink ; fruit short, glabrous, 

 unarmed or nearly so, 7 cm. wide. 



55. Mimosa hystricosa T. S. Brandeg. Univ. Calif. Piibl. Bot. 4:86. 1910. 

 Jalisco to Puebla ; type from Cerro de Gavilan, Puebla. 



Shrub, armed with numerous short spines ; leaflets 5 to 8 nmi. long ; fruit very 

 spiny. 



56. Mimosa monancistra Benth. PI. Hartw. 12. 1839. 



IMimosa hcrincquiana Micheli, Mem. Soc. Phys. Geneve 34: 276. ;)/. 21. 1903. 

 Coahuila to San Luis PotosI, Oaxaca, and Jalisco ; type from Agiiascalientes. 



'Named for Elmer Ottis Wooton (1865-), now of the U. S. Department of 

 Agriculture, who made a collection of plants in Tamaulipas in 1919. 



