368 . SAFFORD : MYRMECOPHILOUS ACACIAS 



colored; interfloral bracteoles tomentose on the upper surface. Fruit not 

 observed. Large stipular spines broadly V-shaped, cinereous, puberulent 

 except at the points, 3 to 4.2 cm. long, 10 mm. broad at the cuneate base, 

 the latter flattened but not adnate to the branch as in ^. Standleiji. 

 Spines of the flowering branches subulate, 3 to 6 mm. long, when young 

 strigose except at the polished red tips. Vegetative leaves not observed. 

 Leaves of the flowering branches with 5 to 12 pairs of pinnae composed of 

 9 to 18 pairs of leaflets, these 2.4 mm. long, 0.8 mm. broad, similar in 

 shape to those of A. Standleiji but with a persistent marginal fringe 

 of stiff short straight hairs; rachis persistently and densely hirtellous, 

 clothed with minute stiff whitish hairs; nectar glands dark purplish, 

 circular, bowl-shaped, with a thick annular magin, one in the smaller 

 leaves of the short branchlets one borne at the base of each pair of pinnae 

 and an additional one on the petiole; on the larger leaves of the longer 

 branches similar glands borne at the base of each pair of pinnae of the 

 upper half of the leaf, but none in the lower half except a solitary gland 

 on the petiole. 



Type in the U. S. National Herbarium, no. 694036, collected on 

 the Rio de las Canas, Department of Santa Rosa, Guatemala, altitude 

 3000 feet, April, 1892, by Heyde and Lux (no. 3299, in part; mixed with 

 specimens of A. hursaria) under the name of ''A. spadicigera." 



Acacia hirtipes is a shrub with densely cmereous-hirtellous young 

 growth, closely related to A. Standleyi but easily distinguished by the 

 dark purplish corolla, the more densely hirtellous indument of the 

 pedmicles and leaf rachis, and the persistent marginal hairs of the leaflets. 



