348 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Densely branched shrub, 30 to 60 cm. high; leaves linear, 6 mm. long or 

 shorter; flowers purplish. " Calderona " (Tamaulipas). 



8. Krameria bicolor S. Wats. Proc. Amer. Acad. 21: 417. 1886. 

 Chihuahua to Sinaloa and Jalisco ; type from Hacienda San Jose, Chihuahua. 

 Shrub, 0.9 to 1.5 meters high, with greenish stems; leaves lanceolate or 



linear, sericeous ; flowers purplish ; fruit about 1 cm. in diameter. 



9. Krameria grayi Rose & Painter, Oontr. U. S. Nat. Herb. 10: 108. 1906. 

 Krameria canescens A. Gray, PI. Wright. 1 : 42. 1852. Not K. canescens 



Willd. 1825. 



Chihuahua and Coahuila. Western Texas (type locality) to southern Cal- 

 ifornia. 



Densely branched shrub, 30 to 90 cm. high ; leaves linear, densely sericeous ; 

 flowers purple. " Chacate " {Ramirez) . 



10. Krameria paucifolia Rose, Contr. U. S. Nat. Herb. 10: 108. 1906. 

 Krameria canescens paucifolia Rose, Contr. U. S. Nat. Herb. 1: 66. 1890. 

 Baja California and Sonora ; type from La Paz, Baja California. 



Low shrub, forming dense masses, the branches often spinose ; leaves linear 

 or lanceolate, 5 to 15 mm. long ; flowers purplish, 6 to 8 mm. long. " Mez- 

 quitillo " (Baja California). 



11. Krameria parvifolia Benth. Bot. Voy. Sulph. 6. pi. 2. 1844. 



Baja California (type locality) and Sonora. Southern California and 

 Arizona. 



Low rigid shrub with gray or brownish branches ; leaves linear, 1.5 cm. 

 long or shorter ; flowers purple. 



The Pima Indians of Arizona use the powdered root in the treatment of sores. 



12. Krameria revoluta Berg, Bot, Zeit. 1856:751. 1856. 

 Krameria collina T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 182. 1915. 

 Oaxaca ; type collected near Tehuantepec. 



Low shrub; leaves linear, 1 to 2 cm. long, sericeous; flowers purple. 



13. Krameria interior Rose & Painter, Contr. U. S. Nat. Herb. 10: 108. 1906. 

 Known only from the type locality, San Juan Capistrano, Zacatecas. 

 Low shrub with shredded bark and purple flowers. 



65. MIMOSACEAE. Mimosa Family. 



Trees or shrubs, often armed with spines ; leaves usually bipinnate, rarely 

 pinnate ; flowers usually small but often showy, capitate, spicate, or racemose ; 

 calyx usually 5-lobed or 5-parted; petals usually 5, free or connate; fruit 

 a legume, but very variable in form. 



In many members of this family the leaves are " sensitive," that is, they 

 respond when touched or struck by folding their leaflets together. They also 

 often act in the same way upon the approach of darkness or during excessively 

 dry weather. A few herbaceous representatives of the family occur in ^Mexico. 



Leaves pinnate 15. INGA. 



Leaves bipinnate. 

 Anthers tipped with a small gland. Stamens usually twice as many as the 

 corolla lobes ; flowers spicate. 



Fruit breaking up into 1-seeded joints. Plants scandent 1. ENTADA. 



Fruit continuous, not breaking up into joints. 

 Fruit septate between the seeds, sometimes spirally coiled. 



2. PROSOPIS. 

 Fruit not septate, never coiled. 



