STANDLEY TREES AND SHRUBS OF MEXICO. 389 



Flowers in spikes 1. L. acapulcensis. 



Flowers in globose heads. 

 Pinnae 1 or 2 pairs. 



Leaflets usually 3 to each pinna, 4 to 9 cm. long ; stipules persistent, large. 



2. L. tergemina. 

 Leaflets numerous, 2 cm. long or shorter ; stipules minute, deciduous. 



3. L. Candida. 

 Pinnae 3 to many pairs. 



Pinnae 20 to 25 pairs 4. L. aurita. 



Pinnae 3 to 13 pairs. 



Leaflets oval, 8 to 12 mm. wide 9. L. sabicu. 



Leaflets oblong, less than 5 mm. wide. 

 Leaflets pubescent beneath. 



Leaves pubescent with appressed hairs 5. L. microphylla. 



Leaves hirtellous with spreading hairs 6. L. watsoni. 



Leaflets glabrous beneath. - ■ 



Pinnae 6 to 13 pairs ; leaflets 7 mm. long or shorter. 



7. L. divaricata. 

 Pinnae usually 3 or 4 pairs ; leaflets about 10 mm. long. 



8. L. bahamensis. 



1. Lysiloma acapulcensis (Kunth) Benth. Lond. .Tourn. Bot. 3: 83. 1844. 

 Acacia acapulcensis Kunth, Mimos. PI. Legum. 7S. ijl. 24- 1819-24. 

 Acacia desmostachya Benth. PI. Hartw. 13. 1830. 



Lysiloma dcsmostacliya Benth. Lond. Journ. Bot. 3:84. 1844. 



Lysiloma acapulcensis brevispicata Rose, Contr. U. S. Nat. Herb. 1: 100. 1891. 



Sonora to San Luis Potosi and Chiapas ; tji)e from Acapulco. Guerrero. Gua- 

 temala. 



Shrub or tree, sometimes 15 meters high, with very hard wood ; leaves 

 pubescent, at least when young, the leaflets very numerous, linear-oblong, 8 mm. 

 long or shorter; stipules large, sometimes persistent; spikes 4 to 6 cm. long; 

 fruit 2.5 to 4.8 cm. wide. " Tepegua je " or " tepehuaje " (MichoacJin, Guerrero, 

 Oaxaca, Sinaloa, Veracruz, Sonora); " tepeoaxin " {Ramirez)', " laaguia " 

 (Oaxaca, Zapotec, Reko). 



The bark is astringent and is used in domestic medicine. It is sometimes 

 chewed to harden the gums. The gum which exudes from the bark is used like 

 gum arabic. 



L. acapulcensis brevispicata Rose, from Sonora, differs only in Its short 

 spikes. 



2. Lysiloma terg'emina Benth. Trans. Linn. Soc. Bot. 30: 534. 1875. 

 Guerrero, Morelos, and Puebla ; type from Acatlan, Puebla. 



Small tree, 3 to 4.5 meters high ; leaflets obliquely oval, rounded or obtuse at 

 apex, bright green, glabrous ; stipules reniform ; flowers white ; fruit 10 to 15 

 cm. long, 3.5 to 4.5 cm. wide, glaucescent. 



3. Lysiloma Candida T. S. Brandeg. Proc. Calif. Acad. II. 2: 153. 1889. 

 Southern Baja California, in canyons and on rocky slopes ; type from Purl- 



sima. 



Tree, sometimes 7.5 meters high, with a trunk 15 to 30 cm. in diameter (often 

 with several trunks), the bark smooth, white; leaflets oblong or oval, obtuse or 

 rounded at apex ; stamens yellow ; fruit 8 to 15 cm. long, 2.5 to 3 cm. wide, the 

 valves thin and papery. " Palo bianco." 



The bark is much used locally for tanning, and is an article of export. For 

 an illustration of a grove of the trees see Contr. U. S. Nat. Herb. 16: pi. 113. 



