Cyperaceae taxon details
Cyperus onerosus M.C.Johnst.
1680287 (urn:lsid:marinespecies.org:taxname:1680287)
accepted
Species
terrestrial
Not documented
Description Herbs, perennial, cespitose, rhizomatous; base cormlike; rhizomes scaly, 12 cm × 2 mm. Culms trigonous, 20–55 cm ×...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from S. W. Naturalist 9: 308 1964 to S. W. Naturalist 9: 308 (1964),...
Description Herbs, perennial, cespitose, rhizomatous; base cormlike; rhizomes scaly, 12 cm × 2 mm. Culms trigonous, 20–55 cm × 1.2–11.8 mm, glabrous. Leaves V-shaped, 12–30 cm × 2–3 mm. Inflorescences: heads digitate, 12–20 mm diam.; rays 7–12, 1–13 cm; 2d order rays 1–3 cm (sometimes absent); bracts 3–5, longest ± erect, V-shaped, 5–12(–18) cm × 2–3 mm. Spikelets (8–)20–30, linear-lanceoloid, compressed, 5–10(–14) × 1.4–1.7 mm; floral scales (8–)16–26, laterally brown to reddish brown, medially green, laterally 1-ribbed, medially 3-ribbed, broadly elliptic, 2–2.5 × 1.2–1.6 mm, apex with slightly excurved cusp 0.2–0.3 mm. Flowers: stamens 3; anthers 1 mm, connective apex reddish, subulate, 0.1 mm; styles 1–1.5 mm; stigmas 1.5 mm. Achenes white to light brown, sessile, ellipsoid, 0.7–0.8 × 0.25–0.35 mm, apex obtuse, apiculate, surfaces puncticulate. [details]
Taxonomic remark Source in seed data: wcs Update namepublishedIn from S. W. Naturalist 9: 308 1964 to S. W. Naturalist 9: 308 (1964),...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from S. W. Naturalist 9: 308 1964 to S. W. Naturalist 9: 308 (1964), information provided by Alan E. on email Jun. 07 2021 More details could be found in [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Cyperus onerosus M.C.Johnst.. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1680287 on 2026-09-05
The webpage text is licensed under a Creative Commons
Attribution 4.0 License
Nomenclature
basis of record
Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Description Herbs, perennial, cespitose, rhizomatous; base cormlike; rhizomes scaly, 12 cm × 2 mm. Culms trigonous, 20–55 cm × 1.2–11.8 mm, glabrous. Leaves V-shaped, 12–30 cm × 2–3 mm. Inflorescences: heads digitate, 12–20 mm diam.; rays 7–12, 1–13 cm; 2d order rays 1–3 cm (sometimes absent); bracts 3–5, longest ± erect, V-shaped, 5–12(–18) cm × 2–3 mm. Spikelets (8–)20–30, linear-lanceoloid, compressed, 5–10(–14) × 1.4–1.7 mm; floral scales (8–)16–26, laterally brown to reddish brown, medially green, laterally 1-ribbed, medially 3-ribbed, broadly elliptic, 2–2.5 × 1.2–1.6 mm, apex with slightly excurved cusp 0.2–0.3 mm. Flowers: stamens 3; anthers 1 mm, connective apex reddish, subulate, 0.1 mm; styles 1–1.5 mm; stigmas 1.5 mm. Achenes white to light brown, sessile, ellipsoid, 0.7–0.8 × 0.25–0.35 mm, apex obtuse, apiculate, surfaces puncticulate. [details]Taxonomic remark Source in seed data: wcs Update namepublishedIn from S. W. Naturalist 9: 308 1964 to S. W. Naturalist 9: 308 (1964), information provided by Alan E. on email Jun. 07 2021 More details could be found in [details]
