prove that it is a native of Rio Negro, in the Banda 

 Oriental. It is not remarkable for beauty, but the structure 

 of the carina and of the style is very peculiar, and renders 

 the plant deserving of a figure in our Magazine. 



Descr. Stem twining and glabrous, as is every part of 

 the plant. Leaves copious, ternate. Leaflets hastato-trilo- 

 bate, the terminal one on a long footstalk, the lateral one 

 almost sessile ; the lateral lobes vary much in length and 

 breadth, and the side ones are often again on the outer 

 margin obscurely lobed, intermediate lobe always elongated. 

 Stipules and stipellee rather small, ovate, striated, mem- 

 branaceous. Peduncles axillary, solitary, many- flowered. 

 Flowers in dense racemes, yellow. Pedicels short. Calyx 

 campanulate, as in the Genus, with a pair of ovate, soon 

 deciduous, striated bracteas at the base. Vexillum and 

 wings more or less twisted. Keel with an extraordinary 

 long, narrow, acuminated point, beautiful, and compactly 

 spirally-twisted, like the shell of a Helix or Trochus. The 

 style, concealed within this, is spirally-twisted in the same 

 manner, and many times larger than the germen. 



Fig. 1. Keel of the Flower. 2. Pistil : — slightly magnified. 



