Monographs Details: Myrcia rotundata (Amshoff) McVaugh
Authority: Maguire, Bassett. 1969. The botany of the Guayana Highland-part VIII. Mem. New York Bot. Gard. 18: 1-290.

Aulomyrcia rotundata Amsh., Rec. Trav. Bot. Neerl. 42: 8. 1950

This distinctive species is easily recognized by the small obovate or often emarginate rigidly coriaceous leaves with the midvein convex on both sides (on the upper side sometimes nearly flat), by the reddish coloration in the herbage and inflorescence, by the sparse appressed-ascending or loosely spreading white or pale reddish hairs up to 0.5 m m long that cover the young branchlets and the inflorescences except the flowers; by the 4-merous flowers which are completely glabrous inside and out except for a few cilia at the tips of the calyx-lobes and a few hairs on the staminal ring; and by the nearly equal, neatly reflexed calyx-lobes that persist nearly unchanged in flower without any tendency to split away.

Seemingly there are a number of disjunct populations in this wholly montane species, but on the basis of the material at hand I cannot recognize more than two varieties. The leaves in specimens from British Guiana are perhaps more often relatively broad and emarginate, but some exactly similar leaves may be found on most Venezuelan specimens. All the Venezuelan specimens have darkened, but perhaps this is an expression of the methods used in drying; I do not find any other correlated differences between the two groups of specimens. One series, however, from Auyan-tepui, is recognizably different.