Tweedie from Buenos-Ayres. I do not think, however, 

 the species inhabits any portion of the Argentine provinces, 

 at least I have never found it in any of the numerous collec- 

 tions 1 have received from Mr. Tweedie. It is probable he 

 obtained the seeds from South Brazil, or, it has been sus- 

 pected, from Paraguay. 



Descr. Judging from the specimens sent to me, the stem 

 is short, leafy ; the leaves opposite, oblong, acuminate, 

 reticulated, downy, obscurely crenated, petiolated : petiole 

 short, thick. Panicle of several flowers. Pedicels oppo- 

 site, bracteated, two inches long. Calyx half-superior, 

 with five nearly spreading, acuminated segments. Corolla 

 pure white, downy : the tube four inches long, a little en- 

 larged and curved upwards, at the base above, with a very 

 conspicuous, broad spur or gibbosity : the limb an inch and 

 a half broad, spreading, equally five-lobed. Stamens four, 

 didynamous, with the rudiment of a fifth. Anther united 

 into a cross. Germen downy, half-inferior, with four glands, 

 three (lower ones) equal in size, the fourth double as large 

 as the others. Style about the length of the tube, curved. 

 Stigma entire. 



Fig. 1. Base of the Corolla laid open, to show the Stamens. 2. Pistil, 

 with the Gland at the base of the Germen : — magnified. 



