Plants Collected in Paraguay. 53 



1 mm, long". Leaves linear, 5 oi* 6 mm. long, mucronulate, in ver- 

 ticils of 5s. Seeds very hairy, without a caruncle. 



Near Luque (337). Determined by A. W. Bennett. December. 



CARYOPHYLLE^. 

 Cerastiiim Sellowii, C. and S. 



Buenos Aires (4). October. Pilcomayo River (921). February. 

 =-. Balansa, No. 22^4, Herb. Kew, in part. 



I brought this plant from Kew under this name, but have since 

 been unable to find the place of its publication. — N. L. B. 



Tissa grandis (H. B. K.), Britton. 



Arenaria grandis, H. B. K., Nov. Gen., vi, 30 (1823). 



Spergularia grandis, Camb. in St. Hil. Fl. Bras., ii, 177. 



Buenos Aires (3). February. Pilcomayo River (921). 



I had ample opportunity to examine this plant on ray Pilcomayo 

 expedition, as it is not infrequent on the muddy banks of that river. 

 It much resembles our common ''Corn Cockle" in general appear- 

 ance. In height it rises from one to two feet dichotomously much 

 branched. The flowers are in irregular cymes at the ends of the 

 branches, each on a short subulate pedicel. Calyx of 5 green 

 sepals, membranous and white on their edges, persistent. Petals 5, 

 white, much smaller than the sepals and hidden by them except 

 when expanded. The 5 hypogynous stamens, opposite the petals, 

 are on very delicate filaments, which are slightly dilated at the base. 

 Ovary superior, 1-celled, many-ovuled, 2-4 mm, in length, increas- 

 ing in fruit to an obtusely 3-angled, 1-celled pod a little longer than 

 the sepals. The pod is filled with flat seeds, which lie horizontally 

 upon each other, and have a broad, membranous wing notched on 

 one side. The plant rises from a long, yellow tap-root. 



Polycarpa australis, Britton, n. sp. 



Diffuse, glabrous, much-brancbed, the branches ascending, terete, 20-50 

 cm. long. Leaves verticillate, oblanceolate or oblong, obtuse, thick, entire, 

 narrowed at the base, 2-5 cm. long, 4-12 mm. wide; inflorescence dichoto- 

 mously cymose, the flowers sessile, white, 1-2 mm. broad ; bracts ovate-lanceo- 

 late, about 2 mm. long ; sepals ovate, obtuse ; petals entire, rounded, shorter 

 than the sepals ; stamens 3; ovary 3-angled, 1-celled; capsule membranous, 

 shining, ovoid, about 4 mm. long. 



Banks of the Pilcomayo River (933). February. 



