Plants Collected in Paraguay. 143 



leaves of 1518 are nearly entire, many of them subopposite ; those 

 of 941 are sharply dentate and but few of them subopposite; while 

 the leaves of 647 a are opposite or alternate, entire or 1-5 dentate 

 on each side, the upper ones linear. The plants are all much 

 branched, the branches rising at a sharp angle. Stem branches 

 and leaves covered with a granular scurf, or in 1518 lepidote. 

 Heads sessile or pedicelled, 15-20 flowered ; scales somewhat 

 spreading, subacute or obtuse, ciliolate, white membranous on the 

 margins. 



Baccliaris trinervis, Pers., Syn., ii, 423. 



Pilcomayo River (1011). April. 



One of the most common species in South America, found in 

 many parts of Brazil, and spreading from Ecquador across the high 

 lands of Bolivia, through Paraguay to the Argentine Republic. 

 The leaves are large, lanceolate, entire, glabrous, shortly petioled 

 and strongly 3-nerved. 



Plucliea quitoc, D.C., 1. c, 450. 



Asuncion (619). March. 



Flowers pale purple, in large terminal cymes, exhaling an agree- 

 able aromatic odor. Stems about 6 dm. high, strict, winged by the 

 decurrent leaves. Common in marshy grounds. 



Tessaria integrifolia, R. and P., Syst., 213. 

 T, mucronata, D.C., Prod., v, 456. 



Near Asuncion (383). January. 



A small tree 5-8 m. in height, occurring in clumps in the low- 

 lands of the Chaco, opposite Asuncion. As described in Benth. and 

 Hook. Gen. PI., the flower of Tessaria does not accord precisely 

 with my specimens. All the outer flowers of the head are abortive. 

 The central flower only is perfect, large, solitary, surrounded by 

 setaceous chaff. All are apparently destitute of pappus. Achenium 

 somewhat 4-gonous and top-shaped. Corolla with 5 large, purple, 

 mucronate lobes, which are united around the staminate column, 

 enclosing them and the style. Style single, just protruding through 

 the opening of the corolla and ending in a club-shaped stigmatic tip. 

 Branches brownish in color. Bark smooth. Leaves oblanceolate, 

 canescent on both sides. 



