EXPLANATION OF THE ILLUSTRATION 
Piare X. (Upper figure). Soranum qurromnse Lam. 
Photograph of the plant from which Schultes & Vil- 
larreal 7616 was collected. 
(Lower figure). An escarpment of Cerro del Cas- 
tillo, Rio Apaporis, Colombia. RuyTIpANTHERA 
MELLIFERA Occurs on these open, exposed quarzitic 
escarpments. 
Photographs by R. F.. Scuu.tres 
