Monographs Details: Rhynchospora tenuis subsp. austro-brasiliensis T.Koyama
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Cyperaceae
Description:Latin Diagnosis - Differt a subsp tenue antheris muito brevioribus tantum 0.8-1 mm longis, spiculis brevioribus 2 bis 4 mm longis maturiate curvulis semper 1-nucigeris, et squamis tenuiter membranaceis. Planta gracilior humiliorque, aut supra basin aut supra medium corymbos duos tresque magis distantes gerens; corymbi ramis ramulisque brevibus dense spiculosi; bracteae plerumque quam corymbus suus longiores.

Distribution and Ecology - Distribution. Southern Brazil and adjoining eastern Bolívia, Paraguay, and northern Argentina. BRAZIL. Minas Gerais and São Paulo, Martius 3367 (M); Minas Gerais: Diamantina, Barão, Km 1 along railroad, Mexia 5893 (NY, US); São Paulo: see type collection; Rio de Janeiro: [without details,] Glaziou 20545a (NY, P); Paraná: Ponta Grossa, Dusen 3965 (NY, P), Carambeí, Rio S. João, Castro, 950 m alt, Reitz & Klein 17900 (NY, US); Rio Grande do Sul: Quinta, Malme 1595 (NY, S). BOLIVIA. Santa Cruz, Buena Vista, 500 m alt, Steinbach 5056 (NY). PARAGUAY. Northern Paraguay, Río Apa, Hassler 8214 (G, NY). ARGENTINA. Misiones: Posades, Bonpland, in Campina near Almacén Finlandesa, Ekman 1300 & 1306 (NY, S).

Discussion:

[Haloschoenus capillaris Nees var minor Nees, FI. Brasil. 2(1): 121. 1842. Type. Martius 3367 (M) from campis udis prov. Minarum Generalium et S. Pauli, Brazil. Invalid name.]

Type. Hoehne 27416 (NY, holotype; SP, US, isotypes) from Parque do Estado, São Paulo, humid place, Estado São Paulo, Brazil.