96 ILLUSTRATIONS OF 
tube: the leaves are 1 inch to 14, or even 20 lines long, 
13-2 lines broad, the internodes being 5 to ?) lines distant ; 
the peduncle is 3 lines, the calyx 7 lines long, obsoletely 10- 
ribbed, the segments are 5 lines in length, the space between 
the ribs not being white and membranaceous as in the former 
species: the tube of the corolla is extremely slender, 14-2 in. 
long, the border measuring 10 lines in diameter.* 
12. Nierembergia rigida (n. sp.) Trav. Chile. 2.532 ;—glaber- 
rima, caulibus ramosis erectis, valde flexuosis, filiformibus, 
striatulis: foliis angustissime linearibus, 3-costatis, mucro- 
nato-aristatis: pedunculis solitariis, brevibus, oppositifoliis, 
calyce 10-costato, laciniis linearibus, rigidis, aristatis, tubo 
3-plo longioribus ; corolle tubo gracili, pubescenti, limbo 
late campanulato, lobis rotundatis.—In Prov. Argentinis et 
Andibus Mendosinis: Rio Negro (Patagonica), Tweedie, 
v. v. et 8. in herb. Hook. 
I found this very distinct species at Punta de Agua and 
Achiras, in the Province of Cordova, about 550 miles from 
Buenos Ayres: it was met with in the Pampas by Dr. 
Gillies, who also collected it in the Cordillera of Mendoza. 
The stems, which arise from a long slender ligneous root, 
are from 6 to 8 inches high, very filiform, extremely flexuose, 
with internodes 3 lines distant: the very rigid leaves are 15 lines 
long, not more than one sixth of a line broad, and somewhat 
falcate and spreading: the peduncle is 3 lines in length ; the 
calyx, 6 or 7 lines long, is furnished with very short and 
almost glandular white pubescence, the tube being only 2 
lines, has 10 very prominent ribs, and 5 rigid linear segments, 
nearly a line broad, tapering gradually to a sharp point, each 
3-nerved : the tube of the corolla is 9 lines long, with a 
white campanular border, nearly an inch in diameter, having 
5 oblong rounded lobes, with purple longitudinal lines ; the 
stamens, fixed in the mouth of the tube, are slightly pu- 
bescent.+ 
* A figure of this species is given in Plate 19 of this Work. 
+ This species is represented in Plate 19. 
