250 Plants Collected in Paraguay. 



joint of the rhizome. Sepals 3, green, oblong, one-half as long as 

 the petals. Petals broad and obtuse at the apex, cuneate at the 

 base, 3 cm. long, with a darker yellow tint at the base inside. 

 Stamens numerous in several series, very dark purple ; anthers 

 black-purple. Styles 6, enlarged at base, whitish below, black- 

 purple above ; stigmas 2-lobed. Leaves on a long petiole similar 

 to the scape, the blade nearly orbicular, entire, subcordate or slop- 

 ing into the petiole, 3-6 cm. in diameter. The plant has a long 

 rootstock running i^n the mud beneath the water or floating, rooting 

 at the nodes and throwing up flower stems and leaves from the 

 joints, growing in shallow pools 3-4 dm. deep. Juice milky. 



NAIADACEJE. 

 L.ilaea subulata, H. and B., Pi. ^q., l, 221. 

 Buenos Aires (20). October. 



Ruppia maritima, L., Sp. PL, 127. 



Pilcomayo River (903). January-February. 

 Abundant in the bed of the upper Pilcomayo on a sandy mud 

 bottom, in brackish water, the plant 6-9 dm. long. 



ERIOCAULE^. 

 Dupatya caillescens (Poir.), Kuntze, Rev. Gen. PL, 745. 



Luque (331). December. 



Stem 3-5 cm. high, from the summit of which numerous scapes 

 spring, 3-10 cm. high. Scapes 3 ribbed, glabrous. Leaves rather 

 loose, linear, 1^-2 cm. long, 2-4 mm. broad, acuminate or slightly 

 mucronate, when young puberulent, glabrescent with age. Heads 

 about 4 mm. in diameter. Involucral bracts and the segments of the 

 outer perianth glabrous, acute, silvery-white. Sheaths about as 

 long as the leaves, obliquely fissured. 



This little plant grows in miry places, not very common. It is 

 the only one of the order that I found in Paraguay, though many 

 others must occur along the northern borders of the country. 



