MULFORD EXPL()I;ATI()N OV THE AMAZON VALLEY 2r)5 



Calliandra stricta 



Glabrous, the branclilets slender, leafy. Stipules to 6 mm. 

 long, ovate, long-aeuminate, pungent, somewhat indurate. Peti- 

 oles 1 to 2 em. long, the petiolules a little shorter, both slender, 

 channeled above. Leaves 1- jugate, 2 ])airs of sessile leaflets on 

 each pinna, the lower pair very much snudler. Glands obliquely 

 placed at the base of the leaflet, so as to partly face each other, 

 blackish, surrounded by a thickened yellowish ring. Leaflets 10 

 to 3.") nun. long, 3 to 12 nun. wide, lanceolate or oblong, blunt at 

 l)()th ends, with a very slight mucro at the summit, thickish, 

 shining above, subtrinervate, the venation slender, very promi- 

 nent beneath. Heads fascicled in the axils, successively pro- 

 duced, short-peduncled. Calyx 2 mm. long, cupulate, the teeth 

 very small. Corolla 8 mm. long, the lobes short, triangular- 

 ovate, obtuse. Exserted portion of stamens twice the length of 

 the corolla. 



San Buena Ventura, Beni, 1,000 feet, M. Cardenas, December 

 1, 1921 {no. 1739). '*A small shrub, with red flowers, on the river 

 bank." 



Acacia rurrenabaqueana 



Closely and densely gray-puberulent. Branchlets slender, 

 strongly sulcate, unarmed. Stipules not seen. Petioles short, 

 stout, flattened above, a large brown gland at or near the first 

 pinnae, the glands of the rachis frequently absent. Pinnae about 

 8 pairs. Petiole and rachis together about 1 dm. long, the pinnae 

 5 to 7 cm. long, the loAver shorter. Pinnules of the longer pinnae 

 25 to 30 pairs, sessile, 7 mm. long, 1.5 to 2 mm. wide, the upper side 

 about a fourth of the width of the lower, the base of which is 

 slightly hastate, the summit slightly upcurved, acute and apicu- 

 late. Margin thickened. Secondaries stout, about 4, strongly 

 interarcliing near the margin. Surfaces grayish-green and 

 minutely puberulent. Panicles terminal and in the upper axils, 

 large and compound, the globose heads on slender peduncles 

 shorter than themselves, 1 cm. or less broad, yellow, very dense, 

 the bracts at the base of the pedicel narrowly subulate, acumi- 

 nate and acute. Calyx campanulate, about two thirds as long as 

 the 5 oblanceolate obtuse petals, lobed half way or more. Petals 

 nearly 2 mm. long. Stamens about 40, nearly distinct, about 5 

 mm. long. Ovary very small, oblong, the style filiform. 



Rurrenabaque, 1,000 feet, M. Cardenas, January 25, 1922 {no. 

 2043). "A medium-sized tree, in sandy loam." 



