STANDLEY TKEES AND SHRUBS OF MEXICO. 359 



Shrub or small tree, 2 to 5 meters high, sparsely armed with flat straight 

 spines ; leaflets obovate-orbicular ; flowers white, the spikes 3 to 4 cm. long, lax. 



4. Mimosa laxiflora Benth. Lond. Journ. Bot. 5: 93. 1846. 

 1 Acacia prosopoides DC. Prodr. 2: 460. 1825. 

 Chihuahua and Sonora (type locality). 



Shrub with few short spines ; leaflets 5 to 12 mm. long, pale green ; flowers 

 white, the spikes 2 to 4 cm. long ; fruit unarmed. 



5. Mimosa distachya Cav. Icon. PI. 3:48. pi. 295. 1794. 

 Mimosa hrandegei Robinson, Proe. Amer. Acad. 33: 316. 1898. 

 Baja California and Sinaloa to Oaxaca and Puebla. 



Shrub, copiously armed with short recurved spines; leaflets 4 to 18 mm. 

 long, pale green ; flowers white or pinkish, the spikes long and lax ; fruit 

 usually setose, 6 to 8 mm. wide. " Garabatillo " ( Oaxaca ) . 



It is possible that Af. hrandegei is a distinct species, but the material at 

 hand can not be separated consistently into two forms. 



6. Mimosa purpurascens PiObinson, Proc. Amer. Acad. 33: 317. 1898. 



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



Shrub or small tree, 2 to 10 meters high ; leaflets 3 to 8 mm. long ; flowers 

 pink ; fruit puberulent, unarmed. " Cuca," " cuilon," " iguano " (Sinaloa). 



In Sinaloa the bark is used for tanning skins, and it is sometimes chewed to 

 harden the gums. 



7. Mimosa polyantha Benth. in Hook. Journ. Bot. 4: 410. 1842. 

 Mimosa polyantha levior Robinson, Proc. Amer. Acad. 33: 318. 1898. 

 Sinaloa to Morelos and Oaxaca ; type from Acatlan, Puebla. Guatemala. 

 Shrub, 1 to 3.5 meters high, copiously armed with spines; leaflets 2 to 4 



mm. long; flowers pink or white, the spikes long and lax; fruit usually hispid, 

 sometimes smooth, about 8 mm. wide. " Arrendador " (Sinaloa). 

 _8. Mimosa polyanthoides Robinson, Proc. Bost. Soc. Nat. Hist. 31: 260. 1904. 



Guerrero; type from mountains above Iguala, altitude 1,200 meters. 



Shrub, 3 to 4.5 meters high ; leaflets 5 to 7 mm. long. 



9. Mimosa stipitata Robinson, Proc. Bost. Soc. Nat. Hist. 31:261. 1904. 

 Guerrero, Oaxaca, Puebla, and Morelos; type from Iguala, Guerrero, altitude 



1,200 meters. 



Shrub or small tree, 1.5 to 4.5 meters high; leaflets 3 to 5 mm. long; flowers 

 white, the spikes 2.5 to 4.5 em. long, lax ; fruit about 4.5 cm. long and 1 cm. wide, 

 glabrous. " Timbin " (MichoacSn, Guerrero). 



Bark used for tanning, 



10. Mimosa ionema Robinson, Proc. Amer. Acad. 36:473. 1901. 

 Guerrero and Morelos; type fi'om Cuernavaca. 



Shrub, 3 to 4.5 meters high, armed with straight flat spines ; leaflets 5 to 9 

 mm. long ; flowers pinkish. 



Doubtfully distinct from M. stipitata. 



11. Mimosa guatemalensis (Hook. & Arn.) Benth. Bot. Voy. Sulph. 89. 1844. 

 Inga guatemalensis Hook. & Arn. Bot. Beechey Voy. 419. 1841. 



Sinaloa and Tepic. Guatemala (type locality) and Nicaragua. 



Shrub, about 2 meters high, densely pubescent, armed with numerous short 

 straight spines ; leaflets oval or obovate-oval, 7 to 20 mm. long ; fruit densely 

 pubescent, unarmed, about 6 mm. wide. 



12. Mimosa puberula Benth. Lond. Journ. Bot 5: 88, 1846. 

 Hidalgo and perhaps elsewhere ; type from Zimapdn. 



Pinnae 5 to 10 pairs, the leaflets oblong, 4 to 5 mm. long; spikes 4 to 5 cm. 

 long ; fruit pubescent. 

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