When, during my stay in Suriname in 1933, I planned to visit the Voltzberg, Prof. S t a h e 1, the Director of the Agriculture Experiment Station, told me that he had discovered there, in one of the fissures in the granitic dome, which forms the top of this low mountain, an unusual kind of cassave. As I had for the “Flora of Suriname” been working on the Euphorbiaceae, 1 was of course much interested in this plant, especially while Prof. S t a h e 1 suggested that it would be possible to cultivate it in the Agricultural at Paramaribo from cuttings. When I arrived at the Voltzberg, the plant was easily found growing in a fissure between the granite plates along one of the ravines just below the dome-shaped top. The plant possessed rather ong (2 3 m) stems, more or less decumbent or creeping along the fissure, and from these stems rose side-branches which bore the eaves and flowers (see tab. IX). The roots were but very little thickened. some of these stems I have taken with me. On the return voyage o 1 aramaribo they were sheltered as much as possible against sun an rain. The side-branches were pressed for the Herbarium.