This is a small and easily recognized Andean group of perhaps 10 species, ranging
from southern Chile to the high mountains of northern Venezuela. It is included here
and in the key because of the possibility that some species m a y yet be found in the
Guayana Highland. For descriptions, and a key to the species of northern South
America, see Field Mus. Publ. Bot. 13(4) [Fl. Peru]: 803-809. 1958.