Cyperus boreobellus is a species of sedge endemic to Kenya. It is a critically endangered species known from only two locations in the former Kwale District of south east Kenya.
Cyperus boreobellus was described in 1983 by botanist KÃÂ¥re Arnstein Lye, based on a holotype specimen collected by Robert Bailey Drummond and James Hatton Hemsley in 1953. The description was published in the second issue of volume three of the Nordic Journal of Botany.
Cyperus boreobellus is known from only two locations in the former Kwale District of south east Kenya at above sea level, where it grows in rocky pools and on damp, shallow sandy soil over rocks.