Monographs Details: Rhynchospora hassleri C.B.Clarke
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Cyperaceae
Description:Distribution and Ecology - Distribution. Sporadically noted in Cuba, Guyana, and southeastern Amazonian Basin. Swampy spots at low altitude. CUBA. Isla de Piños, Ciénaga de Lanier, S of Loma Daguilla, at edge of ditch leading to Cayo del Res, in tembladeros, Ekman 12429 (S). GUYANA. [Without further details,] Parker s n (K), Kamakusa, Upper Mazaruni River, De La Cruz 4064 (NY). SURINAME. Houttuinweg, Dirven 625 (NY, U). BRAZIL. Pará, Prainha (Lower Amazon), Trail 1202 (K). PARAGUAY. See the type.

Discussion:

Rhynchosopra viridi-lutea C. B. Clarke, Kew Bull. Add. Ser. 8: 36. 1908. Syntype. British Guiana, Parker s n (K!, lectotype); Brazil, Lower Amazon, Prainha, Trail 1202 (K!).

Rhynchospora squamulosa K√ľkenthal in Fedde, Repert. Sp. Nov. 23: 201. 1926. Type. Cuba, Isla de Pinos, Ekman 12429 (S !). Syn nov.

Type. Hassler 8255 (K, holotype; isotypes in G, NY) from Funnen Opa, Paraguay.

After a careful comparison between the Cuban specimens and continental South American ones, I was unable to distinguish R. squamulosa and R. viridilutea from R. hassleri. The inflorescences in R. hassleri show a wide range of variation from a single terminal head to large corymbs with eight to 15 elongated rays at two upper nodes of the culm. Cuban R. squamulosa, known only by the type collection, is completely included within the variation range of South American R. hassleri. The difference in the achene shape, oblong vs elliptic, as mentioned by K√ľkenthal, was not recognizable in my observation.

Distribution:Cuba South America| Guyana South America| Suriname South America| Brazil South America| Paraguay South America|