THE BOTANY OF SOUTH AMERICA. 167 



The leaves are nearly glabrous, or slightly ciliolate, the 

 blade elliptic, 6 lines long, 3 lines broad, on a petiole of 6* 

 lines. The calyx is 4 lines long, the tube of the corolla 8 lines 

 long, the border being more tubular and narrower in the 

 mouth than the former species, and much less in diameter. 

 8. Nierembergia calycina, Hook. Bot. Mag. tab. 3371. — Caule 

 repente, filiformi, ramulis procumbentibus, foliisque alternis 

 v. geminis, obovatis, petiolatis, hirto-pubescentibus, pilis 

 canis divaricatis ; pedunculis solitariis, brevibus, extra-axil- 

 laribus ; calyce magno, tubuloso-campanulato, laciniis obo- 

 vatis, foliaceis, expansisj corollse tubo longissimo. — In 

 Andibus, prope Mendozam. v. s. in Herb. Hooker. 

 This species is very distinct from the two former, the axils 

 are more distant, the leaves generally in pairs, obovate, sud- 

 denly acuminate at each end, 9 lines long, 5-6 lines broad, on 

 a short petiole of 2 lines, they are hirsutulate, with long, white, 

 spreading, adpressed hairs ; the peduncles 9 to 1 1 lines long ; 

 the calyx about 9 lines long, is tubular at base, for the length 

 of 3 lines, the lobes being broad, foliaceous, obovato-spathu- 

 late, slightly apiculate, with a row of long spreading hairs on 

 each side of the mid-rib ; the tube of the corolla is extremely 

 slender, 2 inches long, the border broadly campanulate, l£ in. 

 diameter, with 5 rounded lobes, the throat and tube being of 

 a yellowish hue. 



4- Nierembergia rivularis (n. sp.) — Caule repente, filiformi, 

 ramulis procumbentibus, foliisque longissirne petiolatis, 

 spathulato-ovatis glabris; floribus solitariis subsessilibus, 

 oppositifoliis ; calyce curvato, laciniis oblongis, subobtusis, 

 erectis; corollee tubo valde elongato, glabro.— Buenos 

 Ayres. v. v. 



I found this plant on the grassy banks of the Rio de la 

 "lata, the prostrate branches creeping among the grass, above 

 which rise its pretty white flowers. The leaves are alternate, 

 m ore rarely geminate, quite glabrous, the blade is from 9 to 

 12 Hnes long, 4 to 6 lines broad, elliptic, somewhat obtuse 

 at summit, cuneate at base, on a slender petiole H long. The 

 fl ower is solitary upon a short horizontal peduncle, 1 line 



