Monographs Details: Anomospermum chloranthum Diels
Authority: Barneby, Rupert C. & Krukoff, Boris A. 1971. Supplementary notes on American Menispermaceae. VIII. A generic survey of the American Tricilisisae and Anomospermeae. Mem. New York Bot. Gard. 22: 1-89.

Our concept of A. chloranthum covers the same ground as formerly, but after study of the fruits, in which we found an extraordinary variation in sculpture, both internal and external, of the endocarp, w e are now impelled to recognize within it five subspecies. As in the related A. reticulatum, the subspecies are either allopatric or, where their ranges overlap, are recognizable from leaf-characters, so that a key based primarily on geographic dispersal is possible, a key especiaUy to be recommended when so great a proportion of the material is incomplete.

In the Amazon Basin A. chloranthum, represented by the relatively well-known subspecies chloranthum and confusum, is easily distinguished, in absence of the diagnostic staminate flower, from sympatric forms of A. reticulatum by its relatively short and broad, rhombic-ovate leaf-blades, which are usually little longer than wide. On the Pacific slope of the Andes from Ecuador northward to the Isthmus of Panama there are four or perhaps five geographic races of Anomospermum, all known to us in pistillate condition only. We refer three of these to A. chloranthum and one to A. reticulatum, but we lack proof that these will turn out to have the staminate perianths that characterize their Amazonian kindred. Our arrangement of these races is perforce provisional, for there is nothing in the fruit taken by itself which will divide the whole complex of subgenus .Anomospermum into specific units.