has favoured me. Neither indeed do more than two species 
exist in Dr. Von Martius's extensive Brazilian Herbarium, 
one of which is Br. tuberculata, and the other the following 
new species. 
B. Martiana ; labello ovali acuminato ciliato-dentato sessili, petalis sepalisque 
lineari-lanceolatis acuminatis longioribus, clinandrio cucullato inciso. 
Brazil, on the banks of the Rio Negro, Martius.—Leaves subulate, chan- 
nelled, 13 foot long. Flowers white. — Next B. cucullata. 
