Original: "You can't see the achenes, but I did look at them. They were light brown, just over 1mm in length, and with a small differentiated tubercle nearly as wide at its base as the achene but only about 1/5 the length of the body of the achene."
I looked at more material, most tubercles are about or just over 1/4 the length of the achene and not depressed on their shoulders.
Keyed out by Danielle.
Eleocharis is a genus of 250 or more species of flowering plants in the sedge family, Cyperaceae. The name is derived from the Greek words ἕλειος (heleios), meaning "marsh dweller," and χάρις (charis), meaning "grace." Members of the genus are known commonly as spikerushes, although spikesedges is a more technically appropriate name and most scientists who study them in earnest refer to them as such. The genus has a geographically cosmopolitan distribution, with centers of diversity...