Cyperaceae taxon details
Hypolytrum amorimii M.Alves & W.W.Thomas
1678844 (urn:lsid:marinespecies.org:taxname:1678844)
accepted
Species
terrestrial
Not documented
Description Herbs moderately robust, 40–70 cm tall, rhizomatous, caespitose, perennial; rhizome densely branching, short to long...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 124 2002 to Brittonia 54: 124 (2002), information...
Description Herbs moderately robust, 40–70 cm tall, rhizomatous, caespitose, perennial; rhizome densely branching, short to long creeping, 0.2–0.3 cm diam.; pseudoculm trigonous; cataphylls deep wine, chartaceous. Leaves basal; leaf blades linear, 27–42 × 1.5–2.2 cm, arching, deep green to greenish purple adaxially, purple to deep wine abaxially, nonbullate, subcoriaceous, 3-costate with the secondary costae distinct, inverse W-shaped in cross section; apex acute; margins and midrib lightly scabrous; pseudopetiole present; sheath margins 2.5–3 mm wide, brown to deep wine, membranaceous. Culm 1 per plant, scapiform, central, arching, 42–72 cm × 1–1.2 mm, trigonous, lightly scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 3–5 cm long, surpassing or not the synflorescence; pseudopetiole present. Synflorescence terminal, paniculiform, pyramidal, somewhat condensed; main axis 3–4.2 cm long, branched; nodes 4–6; first internode 0.7–1.1 cm long; second internode 0.3–0.6 cm long; paraclades 3 on basal node, patent; second order ramification present and unbranched; main epipodium 0.8–0.9 cm long, lightly scabrous; prophylls 2-keeled. Spike sessile, cylindrical, 7–14 mm long; spicoid bracts 1.8–2.2 mm long, brown, maroon mottled, apex obtuse, margins membranaceous; floral bracts 2, partly connate, 2.1–2.4 mm long, apex acute, keel wingless, faintly scabridulous. Staminate flowers 2 per spicoid; anthers obclavate, 0.5 mm long; filaments 3–3.5 mm long; stigma branches 2; style 0.8–1 mm long. Fructification biconvex, ellipsoid to obovoid, 1.9–2.1 × 1–1.1 mm, plumbeous, not dotted, wrinkled; apex contracted; base slightly obtusoid. [details]
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 124 2002 to Brittonia 54: 124 (2002), information...
Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 124 2002 to Brittonia 54: 124 (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 amorimii M.Alves & W.W.Thomas. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1678844 on 2026-09-23
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 moderately robust, 40–70 cm tall, rhizomatous, caespitose, perennial; rhizome densely branching, short to long creeping, 0.2–0.3 cm diam.; pseudoculm trigonous; cataphylls deep wine, chartaceous. Leaves basal; leaf blades linear, 27–42 × 1.5–2.2 cm, arching, deep green to greenish purple adaxially, purple to deep wine abaxially, nonbullate, subcoriaceous, 3-costate with the secondary costae distinct, inverse W-shaped in cross section; apex acute; margins and midrib lightly scabrous; pseudopetiole present; sheath margins 2.5–3 mm wide, brown to deep wine, membranaceous. Culm 1 per plant, scapiform, central, arching, 42–72 cm × 1–1.2 mm, trigonous, lightly scabrous on angles, leafy; bract subtending the synflorescence foliaceous, linear, 3–5 cm long, surpassing or not the synflorescence; pseudopetiole present. Synflorescence terminal, paniculiform, pyramidal, somewhat condensed; main axis 3–4.2 cm long, branched; nodes 4–6; first internode 0.7–1.1 cm long; second internode 0.3–0.6 cm long; paraclades 3 on basal node, patent; second order ramification present and unbranched; main epipodium 0.8–0.9 cm long, lightly scabrous; prophylls 2-keeled. Spike sessile, cylindrical, 7–14 mm long; spicoid bracts 1.8–2.2 mm long, brown, maroon mottled, apex obtuse, margins membranaceous; floral bracts 2, partly connate, 2.1–2.4 mm long, apex acute, keel wingless, faintly scabridulous. Staminate flowers 2 per spicoid; anthers obclavate, 0.5 mm long; filaments 3–3.5 mm long; stigma branches 2; style 0.8–1 mm long. Fructification biconvex, ellipsoid to obovoid, 1.9–2.1 × 1–1.1 mm, plumbeous, not dotted, wrinkled; apex contracted; base slightly obtusoid. [details]Taxonomic remark Source in seed data: wcs Update namepublishedIn from Brittonia 54: 124 2002 to Brittonia 54: 124 (2002), information provided by Alan E. on email Jun. 07 2021 More details could be found in T [details]
