the flowering specimen was drawn in June, 1841. If we 
are correct in referring it to the O. decumbens of PFEIFFER 
(of which there cannot reasonably be a doubt), it is a native 
of Mexico; but that author puzzles us in saying, that the 
flowers are “ rubri,” whereas in our plant they are of a 
decided, and not deep, yellow colour. He further adds, 
that the articulations are in the German collections always 
unarmed, though he describes them, perhaps from the notes 
of Karwinsk1, as spinous. That author (Karwinsx1) speaks 
of the spots of the articuli as being red, whereas they truly 
are, (according also with Preirrer’s statement, ) of a deeper 
green than the rest of the articulation. 
Descr. Our plant is about two feet in length, disposed 
to be decumbent, of a lively green, the articulations obo- 
vate, thick, but much compressed, at and below the areolz 
having a deep coioured, oblong spot: the areole composed 
of small pulvinate tufts, with one or two small spines often 
recurved, but at the base of the articulation is generally a 
solitary, acicular spine, about three-fourths of an inch long. 
Flowers three to four together. Ovary an inch or more 
long, green, Petals spreading, obovate, waved, yellow : 
Stamens and stigma also yellow. 
