STANDLEY TREES AND SHRUBS OF MEXICO. 387 



13. Calliandra peninsularis Rose, Contr. U. S. Nat. Herb. 5 : 135. 1897. 

 Baja California ; type from La Paz. 



Densely branched shrub ; leaflets 4 to 9 mm. long ; flowers purple ; fruit 

 about 8 mm. wide. " Tabardillo," " zapotillo." 

 Roots used as a remedy for fevers. 



14. CalUandra bijuga Rose, Contr. U. S. Nat. Herb. 5: 135. 1897. 

 Jalisco to Veracruz and Chiapas ; type from Acapulco, Guerrero. 



Shrub or tree, the trunk sometimes attaining a diameter of 20 cm, ; pinnae 1 

 or 2 pairs, the leaflets numerous, 7 to 16 mm. long, bright green, lustrous; 

 flowers purple ; fruit about 1 cm. wide. 



Closely related to C magdalenae (Bert.) Benth., and doubtfully distinct. 



15. CalUandra reticulata A. Gray, PI. Wright. 2: 53. 1853. 



Chihuahua to Jalisco and Puebla. Southern Arizona and New Mexico ; type 

 from Santa Rita, New Mexico. 



Leaflets 4 to 10 mm. long, very thick, with prominent venation ; flowers 

 purple ; fruit about 7 mm. wide, glabrous. 



This and C humiUs are low plants, usually 10 to 20 cm. high, and scarcely 

 deserve to be classed as shrubs, being herbaceous except at the base. 



16. Calliandra humilis (Schlecht.) Benth, Lond, Journ, Bot. 5: 103. 1846, 

 Acacia humilis Schlecht. Linnaea 12: 567. 1838. 



Calliandra herbacea Engelm. ; A Gray, Mem. Araer, Acad, II, 4: 39. 1849, 

 Sonora to Zacatecas and Jalisco ; type from Regla, Hidalgo. Southern Ari- 

 zona and New Mexico. 



Leaflets 6 mm, long or shorter ; fruit about 6 mm. wide, pubescent or glabrate. 



17. Calliandra penduliflora Rose, Contr. U. S. Nat. Herb. 5: 193, 1899. 

 Durango to Oaxaca and Veracruz ; type from BolaQos, Jalisco. 



Shrub, 1.5 to 4.5 meters high ; leaflets mostly 1 to 3 cm. long, rounded at apex ; 

 flowers white, the heads slender-pedunculate, the stamens very long and slender ; 

 fruit 6 to 10 cm, long, about 7 mm. wide, glabrous. 



18. Calliandra malacophylla Benth. Lond, Journ. Bot. 3: 100. 1844. 

 Calliandra unijnga pueUensis Macbride, Contr. Gray. Herb. n. ser. 59: 4. 1919. 

 Puebla and Oaxaca ; type from Monte San Felipe. 



Stiff, densely branched shrub with brownish bark; leaflets few, 5 to 7 mm. 

 long, pubescent; flowers white. 



19. Calliandra unijuga Rose, Contr. U, S. Nat. Herb. 50: 193. 1899, 

 Puebla and Oaxaca ; type from Cuicatlan, Oaxaca, 



Shrub, 1 to 2,5 meters high. 



Very similar to the last species except in the lack of pubescence, and prob- 

 ably only a form of it. The two plants sometimes grow together, for on one 

 sheet examined (Rose 9885, from Puebla) both are associated under the same 

 number. 



20. Calliandra angelica Benth. Lond, Journ, Bot, 3: 100, 1844. 

 Known only from the type locality, Regla, Hidalgo, 



Not seen by the writer. Vernacular name given as " cabellito de Sngel," 



21. Calliandra laxa Benth, Trans. Linn. Soc. Bot, 30: 551. 1875. 

 Acacia laxa Willd. Sp. PI. 4: 1069. 1806. 



Acacia rubescens Mart. & Gal. Bull. Acad. Brux. 10*: 315. 1843. 

 Calliandra xalapensis Benth. Lond. Journ. Bot. 3: 106, 1844. 

 Veracruz to Guerrero and Oaxaca, Northern South America ; type from 

 Venezuela. 



Erect shrub, pubescent or glabrate ; leaflets 4 to 7 mm. long ; flowers white. 



