Cyperus strigosus L.

Synonym: Cyperus stenolepis Torr.

Distribution: Canada to Florida

Habitat: Weedy

Florida status: Native

Recognition: Stigmas 3, the achene triangular. The inflorescence branches have a bottlebrush appearance similar to C. odoratus, which differs by having round, disarticulating (vs. flat) spikelets.

Useful quote from Flora of North America:

Cyperus strigosus is usually among the more common Cyperus species throughout its range. Small individuals flowering the first year may be difficult to distinguish from C. polystachyos, C. odoratus, C. erythrorhizos, and C. esculentus, which may be sympatric. Cyperus strigosus has trigonous achenes and three stigmas, unlike C. polystachyos; C. strigosus has flattened spikelets, unlike the subcylindric ones of C. odoratus; C. strigosus has floral scales usually 3 mm or more, unlike the smaller (1.2–1.5 mm) ones of C. erythrorhizos; C. strigosus has deciduous floral scales and a cormlike stem base with stolons, unlike C. esculentus