Rhynchospora Vahl. Beaksedge, Beakrush.

Contributed by Richard J. LeBlond

Key to Rhynchospora

A genus of about 250 species, subcosmopolitan, but concentrated in tropical and warm temperate America. See Thomas (1984) for the reasons for the inclusion of Dichromena in Rhynchospora. Distributions given for tropical America are largely derived from Thomas (1992)

ID notes:Measurements and descriptions of the achene are of the achene body only, not including the tubercle, unless otherwise indicated. Occasional achenes of various bristle-bearing species, particularly those on immature specimens, will have filaments present alongside the bristles, both of which originate basally. These are not to be confused with the bristles, which are most often barbed, and can be distinguished by their weaker, twisting, and laterally flattened morphology (compared to the stiffer sometimes unilaterally curved but not flexuous or sinuate bristles that are often persistent).

Ref: Bridges & Orzell (2000); Bridges & Orzell (2023) In Weakley et al. (2023, in press); Ciafré & Naczi (2022); Gale (1944); Goetghebeur In Kubitzki (1998b); Kral (1996); Kral (1999); Kral (2002e) In Flora of North America Editorial Committee (2002b); McMillan (2007); Naczi & Moyer (2017); Naczi, Knapp, & Moore (2010); Naczi, Knapp, & Thomas (2012); Sorrie, LeBlond, & Weakley (2018a) In Weakley et al. (2018b); Thomas (1984); Ungberg (2022) In Weakley et al. (2022); Ward (2012a). Show full citations.

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