208 Plants Collected in Paraguay. 



long spines. Perianth with segments 6 or 7 mm. long. Heads 

 silvery-white, densely woolly at the base. It occurs with no. 40. 



Alternantliera Cliacoeiisis, Morong, n. sp. 



Stem decumbent and rooting at the lower nodes, compressed, striate, pilose, 

 thickened and woolly at the nodes, the young shoots woolly, 3-5 dm. high, 

 much branched. Leaves 2-6 cm. long, 8-20 mm. wide, opposite, entire, 

 glabrous above, appressed-pilose beneath, pellucidly lined, obovate, acute 

 and cuspidate at the apex, sloping into a petiole 5-15 mm. long, or the upper- 

 most sessile. Heads sessile, axillary, about 5 mm. in diameter, not spinous. 

 Sepals silvery white, oblong, obtuse, glabrous, equal, 1-nerved, sometimes 

 obscurely tricostate at the base, about 3 mm. long. Bracts shorter. Stamens 

 3, much longer than the pistil ; staminodes entire. 



This species approaches both A. sessilis and A. paronycJiioides, 

 but differs from them in being ascending, in having obtuse and 

 1-nerved sepals and compressed and more woolly stems. The 

 leaves, as in those species, are often in pairs of unequal size. 



In the Chaco territory, Pilcomayo River (1587). February. 



Cromplirena decuinliens, Jacq., Hort. Schoenbr., t. 482. 



Asuncion (42, 73, and 73^). October-January. 



A very pretty and interesting species, quite common in open 

 places about Asuncion, and in the streets of the city. Stems erect, 

 bushy-branched from the base and spreading, lanate, the long white 

 hairs appressed. Heads terminal, subtended by a pair of leaves, 

 at first ovate, elongating with age, woolly-haired under the bracts 

 and perianth segments. The most common is no. 42, with silvery- 

 white heads. No. 73 has purple heads. No. 73j is a rare variety, 

 with yellow heads, 1-2^ dm. high, with long, fleshy roots. 



Gompltrena pereniiis, L., Sp. PL, 224. 



Pilcomayo Kiver (923). February. 



Herbaceous. Stem strigose-hairy, trichotomously branched. 

 Perigonium tipped with yellow at the summit, all the sepals and 

 bracts otherwise silvery-white and woolly at the base. The 2 

 lateral bracts crested and keeled on the back. Heads globular, on 

 long naked peduncles, each head subtended by 1-2 broad, ovate, 

 mucronate, strigose-hirsute bracts. Sometimes the peduncles are 

 as much as 30 cm. in length, and bear 1 or 2 lateral heads as well 

 as the terminal one. Leaves very few, mostly confined to the lower 

 part of the stem, sessile, strigosely hairy, pellucid punctate, the 



