membranous, reticulated, having three very unequal wings ; 
two small, narrow, and equal in breadth throughout, while 
the third forms a large, triangular, very projecting and 
obtuse membrane. : 
The nearest ally of this species is, probably, the B. spa- 
thulata of WittpEnow ; but there, the leaves are far more 
concave, not apiculated, the stipules are larger, and the 
larger wing is acute. The present species was sent to the 
Liverpool Botanic Garden, by Cuartes CHAMBERLAYNE, 
Esq. from Brazil, and flowered in October, 1828. 
I have seen this species cultivated in gardens in Britain, 
under the names of B. setaria and B. sellovit. 
