386 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



Shrub, 1 to 1.5 meters high, the stems densely white-pilose ; leaflets 6 to 8 mm. 

 long, coriaceous, lustrous on the upper surface, white-pilose beneath. 



7. Calliandra houstoniana (Mill.) Standi. 



Mimosa houstoniana Mill. Gard. Diet. ed. 8. Mimosa no. 16. 1768. 



Mimosa houstoni L'Hgr. Sert. Angl. 30. 1788. 



Acacia houstoni Willd. Sp. PI. 4: 1062. 1806. 



Acacia metrosideriflora Schlecht. Linnaea 12: 567. 1838. 



Calliandra houstoni Benth. in Hook. Journ. Bot. 2: 139. 1840. 



Sonora to Tamaulipas and Chiapas; type from Veracruz. Guatemala and 

 Honduras. 



Shrub or small tree, 1 to 6 meters high, pubescent or glabrate; bark red- 

 brown ; leaflets 4 to 7 mm. long, the upper surface with a metallic luster ; 

 flowers purplish red, large and showy ; fruit about 1.5 cm. wide, densely brown- 

 hirsute. " Charaniusco " (Tabasco); " hierba burro" (Chiapas); " pambo- 

 tano" (southern Mexico); "day," " tabardillo " (Sinaloa). Probably the 

 names reported for C. anomala apply also to this species. 



The same properties are attributed to this as to C. anomala. The bark is 

 chewed to harden the gums (in Sinaloa). According to the U. S. Dispensatory, 

 the root bark, under the name of " pambotano bark " (sometimes written errone- 

 ously as "pandotano") has been highly recommended in Europe as an anti- 

 periodic. It is said also to contain an alkaloid which produces death by systolic 

 arrest of the heart. 



8. Calliandra nitida S. Wats. Proc. Amer. Acad. 22: 410. 1887. 

 Zacatecas, Jalisco, and Tepic; type from Rio Blanco, Jalisco. 



Shrub, 1 meter high or less, copiously pubescent; leaflets 4 to 7 mm. long, 

 with a metallic luster; flowers purplish red. " Potosina " (Jalisco). 



9. Calliandra conzattii Standi. Contr. U. S. Nat. Herb. 20: 188. 1919. 

 Known only from the type locality, Rio de Pilas, Oaxaca, altitude 300 meters. 

 Leaflets 5 to 7, obliquely ovate or elliptic, 2.5 to 6 cm. long, acute or obtuse, 



bright green, glabrate; flowers very small, greenish. 

 Perhaps not of this genus but rather a PithecolloMum. 



10. Calliandra eriophylla Benth. Lond. Journ. Bot. 3 : 105. 1844. 

 Calliandra chamnedrys Engelm. : A Gray, Mem. Amer. Acad. II. 4: 39. 1849, 

 Calliandra conferta Benth.; A. Gray, PI. Wright. 1: 63. 1852. 



Sonora to Coahuila and Puebla ; type from Chila. Puebla. Western Texas to 

 southern Arizona. 



Shrub, commonly about 30 cm. high, usually densely branched, the branches 

 stiff, gray ; leaflets few, 3 to 4 mm. long ; heads few-flowered, the flowers pur- 

 ple; fruit 5 mm. wide, pubescent. 



11. Calliandra calif Omica Benth. Bot. Voy. Sulph. 14. pL 11. 1844. 



Baja California, on dry stony hillsides, often abundant; type from Magda- 

 lena Bay. 



Stiff, densely branched shrub, 1 to 2 meters high ; leaflets 4 to 13 mm. long, 

 thick, pale ; flowers purplish red ; fruit about 7 mm. wide. 



12. Calliandra cumingii Benth. in Hook. .lourn. Bot. 2: 140. 1840. 

 Calliandra cumingii galeottii Benth. Lond. Journ. Bot. 3: 106. 1844. 

 Inga speciosa Mart. & Gal. Bull. Acad. Brux. 10 ': 320. 1843. 

 Puebla and Oaxaca. Type from Colombia. 



Shrub, 30 to 60 cm. high ; leaflets 1 cm. long or shorter ; flowers purplish red, 

 the heads long-pedunculate. 



The writer has seen no Colombian material, and it may be that the Mexi- 

 can plant represents a different species. If so, the name published by Mar- 

 tens and Galeotti is available. 



