Cyperaceae name details
Hypolytrum amplissimum M.Alves & W.W.Thomas
1690080 (urn:lsid:marinespecies.org:taxname:1690080)
unaccepted
Species
terrestrial
Not documented
Description Herbs robust, 0.9–1.2 m tall, rhizomatous, caespitose, perennial; rhizome short creeping, 1.5 cm diam.; pseudoculm...
Taxonomic remark Source in seed data: wcs Updated namePublishedIn from Feddes Repert. 113: 261 2002 to Feddes Repert. 113(3-4): 261 (2002)....
Description Herbs robust, 0.9–1.2 m tall, rhizomatous, caespitose, perennial; rhizome short creeping, 1.5 cm diam.; pseudoculm trigonous; cataphylls brown, coriaceous. Leaves basal; leaf blades linear, 1.2–1.3 m × 2.8–3.2 cm, arching, non-bullate, green, coriaceous, 3-costate with secondary costae distinct, inverse W-shaped in cross-section, apex acute, margins and midrib slightly scabrous; pseudopetiole absent; sheath margins 3–4 mm wide, brown, membranaceous. Culm one per plant, scapiform, central, erect, robust, ca. 80 cm × 4–5 mm, trigonous, scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 50–68 cm, surpassing the synflorescence; pseudopetiole absent. Synflorescence terminal, paniculiform, pyramidal, lax; main axis 17–28 cm long, strongly branched; nodes 7–10; first internode 5–13 cm long; second internode 2.8–4 cm long; paraclades 4–6 on basal node, patent or erect; second-order ramification present and branched; main epipodium 2–2.8 cm long, scabrous; prophylls faintly bikeeled. Spike stalked, ellipsoid, 4–6 mm long; spicoid bracts 1.9–2.1(–3.4) mm long, brown, apex obtuse, mucronate, sometimes long-mucronate on basal ones, margins membranaceous; floral bracts 2, free, 2.5–3.2 mm long, keel wingless, scabridulous. Staminate flowers 2 per spicoid; anther obclavate, ca. 1.5 mm long; filament 4–5 mm long; style 1.5–2 mm long; stigma branches 2. Fructification biconvex, ellipsoid, 2–2.5 × 1–1.3 mm, constricted at apex, base obtusoid, greenish brown to plumbeous and reddish-dotted, slightly wrinkled. [details]
Taxonomic remark Source in seed data: wcs Updated namePublishedIn from Feddes Repert. 113: 261 2002 to Feddes Repert. 113(3-4): 261 (2002)....
Taxonomic remark Source in seed data: wcs Updated namePublishedIn from Feddes Repert. 113: 261 2002 to Feddes Repert. 113(3-4): 261 (2002). , according to IPNI. Information provided by Alan E. on email Jul. 15 2020. More details could be found in [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Hypolytrum amplissimum M.Alves & W.W.Thomas. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1690080 on 2026-09-11
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]
From editor or global species database
Description Herbs robust, 0.9–1.2 m tall, rhizomatous, caespitose, perennial; rhizome short creeping, 1.5 cm diam.; pseudoculm trigonous; cataphylls brown, coriaceous. Leaves basal; leaf blades linear, 1.2–1.3 m × 2.8–3.2 cm, arching, non-bullate, green, coriaceous, 3-costate with secondary costae distinct, inverse W-shaped in cross-section, apex acute, margins and midrib slightly scabrous; pseudopetiole absent; sheath margins 3–4 mm wide, brown, membranaceous. Culm one per plant, scapiform, central, erect, robust, ca. 80 cm × 4–5 mm, trigonous, scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 50–68 cm, surpassing the synflorescence; pseudopetiole absent. Synflorescence terminal, paniculiform, pyramidal, lax; main axis 17–28 cm long, strongly branched; nodes 7–10; first internode 5–13 cm long; second internode 2.8–4 cm long; paraclades 4–6 on basal node, patent or erect; second-order ramification present and branched; main epipodium 2–2.8 cm long, scabrous; prophylls faintly bikeeled. Spike stalked, ellipsoid, 4–6 mm long; spicoid bracts 1.9–2.1(–3.4) mm long, brown, apex obtuse, mucronate, sometimes long-mucronate on basal ones, margins membranaceous; floral bracts 2, free, 2.5–3.2 mm long, keel wingless, scabridulous. Staminate flowers 2 per spicoid; anther obclavate, ca. 1.5 mm long; filament 4–5 mm long; style 1.5–2 mm long; stigma branches 2. Fructification biconvex, ellipsoid, 2–2.5 × 1–1.3 mm, constricted at apex, base obtusoid, greenish brown to plumbeous and reddish-dotted, slightly wrinkled. [details]Taxonomic remark Source in seed data: wcs Updated namePublishedIn from Feddes Repert. 113: 261 2002 to Feddes Repert. 113(3-4): 261 (2002). , according to IPNI. Information provided by Alan E. on email Jul. 15 2020. More details could be found in [details]
To International Plant Names Index (IPNI)
To New York Botanical Garden Steere Herbarium (Hypolytrum_amplissimum_NY546735_holotype_1)
To Plants of the World Online
To New York Botanical Garden Steere Herbarium (Hypolytrum_amplissimum_NY546735_holotype_1)
To Plants of the World Online
From editor or global species database
Hosted externally
