Monographs Details: Hypolytrum laxum Kunth
Authority: Maguire, Bassett. 1967. The botany of the Guayana Highland--Part VII. Mem. New York Bot. Gard. 17: 1-439.
Family:Cyperaceae
Scientific Name:Hypolytrum laxum Kunth
Description:Distribution and Ecology - Northwestern Amazonian Basin at the Colombian and Venezuelan border, relatively scarce. COLOMBIA. Vaupes: Rio Pacoa, alt ca 900 ft, Schultes & Cabrera 15260; Rio Apaporis, Jirijirimo, alt 250 m, H. Garcia-Barriga. 13684 (US) ; Raudal de Jirijirimo, below mouth of Rio Kananari, quarzite base, alt 900 ft, Schultes & Cabrera 14549 (US), 15010 (NY). BRAZIL. Amazonas: Rio Japura, near Miranha, Martins 127 (M); Rio Japura, prov. fluminis Nigri, in sylvis petrosis udis ad cataractas Cupatensis, Martins 79 (M!, type of H. caespitosum).Examination of the types of Hypolytimm laxum and H. caespitosum, both kept in the Munich herbarium, indicated that these two plants are identical. This small-sized Hypolytrum is well characterized by the lenticular broadly ovate fructifications densely spotted with dark brown resinous puncticulations. The short beak of the fructifications are broadly conical and are exposed over the blunt apex of ellipsoid orange-brown glumes.

Discussion:

Beera laxa Schrader ex Kunth, Enum. PI. 2: 270. 1837. Invalid name in synonymy.

Beera caespitosa Schrader ex Kunth, Enum. Pl. 2: 270. 1837. Invalid name in synonymy.

Hypolytrum caespitosum Schrader ex Nees, Fl. Brasil. 2(1): 68. 1842. Syn nov.

Type. In umbrosis ad ripam fluvii Japura, prope Miranharum pagnum, prov. fluminis Nigri, Martins 127 (M!).

Distribution:Colombia South America| Brazil South America|