Cyperaceae taxon details
Hypolytrum leptocalamum M.Alves & W.W.Thomas
1678869 (urn:lsid:marinespecies.org:taxname:1678869)
accepted
Species
terrestrial
Not documented
Description Herbs moderately robust to rarely robust, 20–80 cm tall, rhizomatous, sometimes caespitose; rhizome densely branching,...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 131 2002 to Brittonia 54: 131 (2002), information...
Description Herbs moderately robust to rarely robust, 20–80 cm tall, rhizomatous, sometimes caespitose; rhizome densely branching, long to short creeping, 0.2–0.4 cm diam.; pseudoculm bulblike; cataphylls brown to reddish, chartaceous. Leaves basal; leaf blades linear, 12–50 × 0.7–1 cm, erect to arching, greenish brown, nonbullate, coriaceous, 3-costate with secondary costae distinct, inverse W-shaped in cross section, apex acute, margins and midrib scabrous and revolute; pseudopetiole absent; sheath margins 2–2.5 mm wide, reddish brown, membranaceous. Culm 1 per plant, scapiform, central, erect, 25–75 cm × 2–2.5 mm, trigonous, scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 2.5–9(–18) cm long, occasionally surpassing the synflorescence. Synflorescence terminal, paniculiform, pyramidal, lax; main axis 2.5–5 cm long, branched; nodes 3–5; first internode 0.3–1.1 cm long; second internode 0.1–0.9 cm long; paraclades 3 on basal node, patent; second-order ramification present and branched or occasionally unbranched; main epipodium 0.4–2.2 cm long, lightly scabrous; prophylls 2-keeled. Spike stalked, broadly ellipsoid, occasionally cylindric, 8–14(–21) mm long; spicoid bracts 2.7–2.8 mm long, brown, apex obtuse, dorsally mucronate, margins membranaceous and scabridulous; floral bracts 2, partly connate, 2.3–2.5 mm long, apex acute, keel wingless, densely scabridulous. Staminate flowers 2 per spicoid; anthers obclavate, 1–1.2 mm long; filaments 2.5–3 mm long; stigma branches 2; style 2–2.5 mm long. Fructification unequally convex, obovoid, 3–3.4 × 1.6–2 mm, greenish brown and scattered reddish-dotted, slightly wrinkled, apex and base obtusoid. [details]
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 131 2002 to Brittonia 54: 131 (2002), information...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 131 2002 to Brittonia 54: 131 (2002), information provided by Alan E. on email Jun. 07 2021 More details could be found in T [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Hypolytrum leptocalamum M.Alves & W.W.Thomas. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1678869 on 2026-09-20
The webpage text is licensed under a Creative Commons
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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 moderately robust to rarely robust, 20–80 cm tall, rhizomatous, sometimes caespitose; rhizome densely branching, long to short creeping, 0.2–0.4 cm diam.; pseudoculm bulblike; cataphylls brown to reddish, chartaceous. Leaves basal; leaf blades linear, 12–50 × 0.7–1 cm, erect to arching, greenish brown, nonbullate, coriaceous, 3-costate with secondary costae distinct, inverse W-shaped in cross section, apex acute, margins and midrib scabrous and revolute; pseudopetiole absent; sheath margins 2–2.5 mm wide, reddish brown, membranaceous. Culm 1 per plant, scapiform, central, erect, 25–75 cm × 2–2.5 mm, trigonous, scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 2.5–9(–18) cm long, occasionally surpassing the synflorescence. Synflorescence terminal, paniculiform, pyramidal, lax; main axis 2.5–5 cm long, branched; nodes 3–5; first internode 0.3–1.1 cm long; second internode 0.1–0.9 cm long; paraclades 3 on basal node, patent; second-order ramification present and branched or occasionally unbranched; main epipodium 0.4–2.2 cm long, lightly scabrous; prophylls 2-keeled. Spike stalked, broadly ellipsoid, occasionally cylindric, 8–14(–21) mm long; spicoid bracts 2.7–2.8 mm long, brown, apex obtuse, dorsally mucronate, margins membranaceous and scabridulous; floral bracts 2, partly connate, 2.3–2.5 mm long, apex acute, keel wingless, densely scabridulous. Staminate flowers 2 per spicoid; anthers obclavate, 1–1.2 mm long; filaments 2.5–3 mm long; stigma branches 2; style 2–2.5 mm long. Fructification unequally convex, obovoid, 3–3.4 × 1.6–2 mm, greenish brown and scattered reddish-dotted, slightly wrinkled, apex and base obtusoid. [details]Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 131 2002 to Brittonia 54: 131 (2002), information provided by Alan E. on email Jun. 07 2021 More details could be found in T [details]
To Biodiversity Heritage Library (2 publications)
To International Plant Names Index (IPNI)
To New York Botanical Garden Steere Herbarium (Hypolytrum_leptocalamum_NY546736_holotype_1)
To Plants of the World Online
To International Plant Names Index (IPNI)
To New York Botanical Garden Steere Herbarium (Hypolytrum_leptocalamum_NY546736_holotype_1)
To Plants of the World Online
From editor or global species database
Hosted externally
