Plants Collected in Paraguay. 99 



petiole 8-15 ram. long; secondary petiole about 5 mm., hairy like the stem. 

 Pinnae about 4 cm. long, often a little curved ; leaflets 5 or 6 mm. long and 

 2 mm. wide, 15-25 pairs, oblong, sessile, oblique at the base, mucronulate, 

 glabrous or minutely pubescent above, appressed-pilose beneath, ciliate with 

 long hairs, 1- rarely 2-ribbed, the midrib approximate to the margin ; cross- 

 nerves distinct, 5 or 6 on each side of the midrib. Stipules persistent, lanceo- 

 late, very acute, striate, ciliate and pubescent, 5 or 6 mm. long. Flowers not 

 seen. Bracts ciliate. Legumes 1-1^ cm. long, 4 mm. wide, with 2-4 joints, 

 constricted between the joints, apiculate, strongly appressed-pilose all over. 



Railroad track between Escoba and Caballero (1501). January. 

 Named for Dr. T. F. Allen, of New York, a generous donor to 

 the equipment of the expedition. 



Sclirankia leptocarpa, D.C., Mem. Leg., 12. 



Asuncion (85). November-December. 



A stiff, angular-stemmed shrub, creeping on the ground, or run- 

 ning over bushes, to which it clings by its spines. Stems with 

 numerous, small, hooked spines, 15-24 dm. in length. Leaves bi- 

 pinnate, the rachis with a circle of spines at the base, and smaller 

 spines along its face ; 4 or 5 pairs of pinnae, a weak spine between 

 each pair; leaflets about 15 pairs, the secondary rachis ending with 

 a weak spine. Flowers bright, bluish-purple, in heads, the long 

 projecting stamens and styles giving them an elegant appearance. 

 Fruit a narrow, straight legume 6 cm. long, having upon it 10 or 

 more rows of straight sharp setae ; seeds black, shining, irregular 

 in shape. The leaves of this plant are as sensitive as those of a 

 Mimosa, closing at a touch. Common in thickets. 



Acacia aroma, Gillies in Hook. Bot., iii, 206. 



Pilcomayo Kiver (931 and 1502). February. 



A thorny shrub 1^-4 m. high. Leaves bipinnate, with spiny 

 stipules. Spines on the stems long and sharp. Flowers yellow, in 

 globular balls, about 1 cm. in diameter, and closely packed together. 

 The long, bright yellow, exserted stamens form the visible part of 

 the flower. Fruit a hairy legume, moniliform, 5-7 cm. long, with 

 5-8 joints. The flowers are not fragrant. 



Acacia Bonariensis, Gillies, Hook. Bot. Misc., iii, 207. 



Asuncion (49). November. 



A very thorny shrub 2-5 m. high. Stem angled, smooth or 

 minutely downy, covered wiih long, sharp, dangerous spines 



