Monographs Details: Strychnos xinguensis Krukoff
Authority: Krukoff, Boris A. 1965. Supplementary notes on the American species of Strychnos VII. Mem. New York Bot. Gard. 12: 1-94.
Description:Distribution and Ecology - This species is known only from the type collection made in the State of Para (near Providência on the lower Rio Xingu), Brazil.
Discussion:As per Ducke (31: 26), in addition to the type deposited with Museu Goeldi (Museu Paraense) at Belem (Para), isotypes are available at Kew and Jard. Bot. of Rio de Janeiro. It looks as though this species has a limited distribution, or is rare. The personnel of the Instituto Agron. do Norte (including my former field assistant Froes, also Ducke) have been searching for species of Strychnos extensively from 1942 to 1960 and failed to re-collect this plant. It is true, of course, that the basins of the middle and the upper Rio Xingu and Rio Tapajos (access to which up to the present was so difficult) were not searched and it is quite possible that the type collection was made on the outskirts of its northern range, also that this species may yet prove to be rather common on the upper ranges of these two rivers.
The fruits of this species are still unknown. It would be important to collect and describe mature fruits and seeds and place this species in the proper place in the key made by Ducke, which is based on the fruit characters (31: 53-57). It would also be important to collect a series of specimens from various parts of mature and young plants so that we could distinguish it on the basis of sterile material with more confidence.
Distribution:Brazil South America