This page provides a list of all Arkansas Cyperus sedges, as of October 2000. I am adding brief hints for the field identification of each taxon, eventually (modified Sept. 2003). Taxonomic problems have yet to be settled on the genus in Arkansas.
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Cyperus acuminatus Torr. & Hook.
I need to write up info on this species.
Cyperus aristatus Rottb.
The status of C. aristatus needs further review. It appears to possibly be correctly called Cyperus squarrosus L.
I need to write up info on this species.
Cyperus bipartitus Torr.
I need to write up info on this species.
Cyperus compressus L.
I need to write up info on this species.
Cyperus croceus Vahl
I need to write up info on this species.
Cyperus cuspidatus Kunth
This species needs further review. It may not be in Smith's (1994) keys for Arkansas flora.
Cyperus echinatus (L.) Wood
I need to write up info on this species. Its common in Arkansas.
Cyperus erythrorhizos Muhl.
I need to write up info on this species. Its a common, weedy species.
Cyperus esculentus L.
I need to write up info on this species.
Cyperus flacescens L. var. poiformis (Pursh) Fern.
I need to write up info on this species.
Cyperus flavicomus Michx.
I need to write up info on this species.
Cyperus grayioides Mohlenbrock
John Logan found this species of deep sandy soils in southwest Arkansas at a few locations in the late 1990s, new to Arkansas.
Cyperus haspan L.
Cyperus haspan is an interested beast. I found it only streamsides, so this plant "likes its feet wet" as Tony Reznicek said of Carex ozarkana.
Cyperus hystricinus Fern.
I need to write up info on this species.
Cyperus iria L.
I need to write up info on this species.
Cyperus lancastriensis Porter
I need to write up info on this species.
Cyperus lupulinus (Spreng.) Marcks
Cyperus lupulinus may have two valid variety's I've not checked out, ssp. lupulinus and ssp. macilentus
Cyperus odoratus L.
I need to write up info on this species.
Cyperus oxylepis Nees ex Steud.
I need to write up info on this species.
Cyperus plukenetii Fern.
This sedge, Cyperus plukenetii is a robust plant of deep sandy soils, at least in Louisiana. It can be told from many Cyperus species by its hairy stems!
Cyperus polystachyos Rottb. var. texensis
I need to write up info on this species.
Cyperus pseudovegetus Steud. var. pseudovegetus
This neat plant is common in roadside ditches, and is one of the easier species in the genus to learn.
Cyperus re* species note! Several species in this genus have VERY similar names, which seem to have NO relation to any actual relationship between them. Some are wetland species, some are of roadsides, and some are of natural habitats primarily. One just has to sort them out. I would advise a careful reading of any keys to make sure you have the correct "re*" species. It is easy to pick the wrong one if you are in a hurry, which totally messes up your identification.
Cyperus refractus Torr.
I need to write up info on this species.
Cyperus retroflexus Buckley
I need to write up info on this species.
Cyperus retrofractus (L.) Torr.
I need to write up info on this species.
Cyperus retrorsus Chapm.
This "re*" species is easier to identify than most Cyperus. It has compact heads similar to C. echinatus, but they are smaller and oblong. Look for it on roadsides, where it is actually common (at least in southern Arkansas, I've not checked north Arkansas yet). It often grows as very widely scattered plants, so once you find one, like many Cyperus you may have to hunt a few minutes to find more. I have found colonies with 30 or more plants scattered over several square yards, but more often find individuals scattered up to 100 yards apart. Don't worry about hurting the population though. This weedy species will often be found at every stop in a county on roadsides, but with only a few plants found in each 15 minute collecting stop.
Cyperus rotudus L.
I need to write up info on this species.
Cyperus schweinitzii Torr.
I need to write up info on this species.
Cyperus strigosus L.
Perhaps Arkansas' most widespread Cyperus, this plant is often abundant in roadside ditches. Yet, it is also found as scattered individuals at some sites.
Cyperus surinamensis Rottb.
I need to write up info on this species.
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