Cyperaceae taxon details
Ammothryon R.L.Barrett, K.L.Wilson & J.J.Bruhl
1675216 (urn:lsid:marinespecies.org:taxname:1675216)
accepted
Genus
Ammothryon grandiflorum (Nees ex Lehm.) R.L.Barrett, K.L.Wilson & J.J.Bruhl (type by original designation)
recent only
Barrett, R. L.; Bruhl, J. J.; Wilson, K. L. (2021). Revision of generic concepts in Schoeneae subtribe Tricostulariinae (Cyperaceae) with a new genus <i>Ammothryon</i> and new species of <i>Tricostularia</i>. <em>Telopea.</em> 24: 61-169., available online at https://doi.org/10.7751/TELOPEA14844
page(s): 76 [details] Available for editors
[request]
page(s): 76 [details] Available for editors
[request]
Description Perennial tufted herbs, 0.7–1.5 m high; rhizome thick, 10–22 mm diam., sometimes pseudobulbous; roots sand-binding;...
Etymology From the Greek ammos (sand) and thryon (rush), [neuter] in reference to the habitat of this genus, in sandy heath and woodland.
Description Perennial tufted herbs, 0.7–1.5 m high; rhizome thick, 10–22 mm diam., sometimes pseudobulbous; roots sand-binding; plants clonal, 0.3–1 m across; caudex present; old leaf sheaths covering the caudex, not breaking apart into fibres with age, pale brown to reddish brown. Culms stout, erect, leafy, with 4–7 nodes, obtusely trigonous, 2.5–7 mm diam., somewhat ribbed, usually scabrous but otherwise glabrous, base enlarged. Leaves basal and cauline, numerous, reducing in size up the culm, ultimately bract-like; phyllotaxy loosely spirotristichous, sheath scabrous, especially on upper leaves, loose around culm, 20–28(–38) mm long, not broader than the leaf lamina, upper margin with short, thick, brownish hairs, ligule absent; lower leaf lamina (150–)220–460 mm long, 5–15 mm wide, lamina ± linear, flat or usually folded, margins and prominent midrib scabrous, apex gradually attenuate. Inflorescence open, panicle-like, narrow, 120–750 mm long, 20–45 mm wide; with 7–14 nodes, bracts leaf-like, exceeding the spikelet clusters; branches spreading, with (1–)3–12 spikelets on peduncles 7–16 mm long, arising in each bract axil; spikelet prophyll absent. Spikelets brown, very narrowly ovate, 12–22 mm long, with 10–14 glumes, finely and very shortly hairy, only topmost 2–4 fertile, all bisexual, basal glumes 3–6 mm long; fertile glumes 11–20 m long, glabrescent, acute, becoming acuminate; rachilla compact and not or scarcely sinuous in fruiting spikelets. Perianth absent. Stamens 3; anther connective 6–11 mm long, linear to subulate; anthers pale yellow, 7–10 mm long, with a glabrous apical appendage 1.0–1.5 mm long. Style 16–22 mm long, trifid; base 8–12 mm long, slightly enlarged so continuous with the nutlet, branches 8–10 mm long, hairy. Nutlet sessile, subovoid but base contracted, 3.2–3.8 mm long, 1.8–2.2 mm diam., with three white ribs that broaden towards the apex; embryo not examined. Photosynthetic pathway inferred from anatomy to be C3. 1C = 0.39 pg. [details]
Etymology From the Greek ammos (sand) and thryon (rush), [neuter] in reference to the habitat of this genus, in sandy heath and woodland.
Etymology From the Greek ammos (sand) and thryon (rush), [neuter] in reference to the habitat of this genus, in sandy heath and woodland. [details]
Cyperaceae Working Group. (2026). [see How to cite]. Global Cyperaceae Database. Ammothryon R.L.Barrett, K.L.Wilson & J.J.Bruhl. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1675216 on 2026-05-21
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Nomenclature
original description
Barrett, R. L.; Bruhl, J. J.; Wilson, K. L. (2021). Revision of generic concepts in Schoeneae subtribe Tricostulariinae (Cyperaceae) with a new genus <i>Ammothryon</i> and new species of <i>Tricostularia</i>. <em>Telopea.</em> 24: 61-169., available online at https://doi.org/10.7751/TELOPEA14844
page(s): 76 [details] Available for editors [request]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 76 [details] Available for editors
[request]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 Perennial tufted herbs, 0.7–1.5 m high; rhizome thick, 10–22 mm diam., sometimes pseudobulbous; roots sand-binding; plants clonal, 0.3–1 m across; caudex present; old leaf sheaths covering the caudex, not breaking apart into fibres with age, pale brown to reddish brown. Culms stout, erect, leafy, with 4–7 nodes, obtusely trigonous, 2.5–7 mm diam., somewhat ribbed, usually scabrous but otherwise glabrous, base enlarged. Leaves basal and cauline, numerous, reducing in size up the culm, ultimately bract-like; phyllotaxy loosely spirotristichous, sheath scabrous, especially on upper leaves, loose around culm, 20–28(–38) mm long, not broader than the leaf lamina, upper margin with short, thick, brownish hairs, ligule absent; lower leaf lamina (150–)220–460 mm long, 5–15 mm wide, lamina ± linear, flat or usually folded, margins and prominent midrib scabrous, apex gradually attenuate. Inflorescence open, panicle-like, narrow, 120–750 mm long, 20–45 mm wide; with 7–14 nodes, bracts leaf-like, exceeding the spikelet clusters; branches spreading, with (1–)3–12 spikelets on peduncles 7–16 mm long, arising in each bract axil; spikelet prophyll absent. Spikelets brown, very narrowly ovate, 12–22 mm long, with 10–14 glumes, finely and very shortly hairy, only topmost 2–4 fertile, all bisexual, basal glumes 3–6 mm long; fertile glumes 11–20 m long, glabrescent, acute, becoming acuminate; rachilla compact and not or scarcely sinuous in fruiting spikelets. Perianth absent. Stamens 3; anther connective 6–11 mm long, linear to subulate; anthers pale yellow, 7–10 mm long, with a glabrous apical appendage 1.0–1.5 mm long. Style 16–22 mm long, trifid; base 8–12 mm long, slightly enlarged so continuous with the nutlet, branches 8–10 mm long, hairy. Nutlet sessile, subovoid but base contracted, 3.2–3.8 mm long, 1.8–2.2 mm diam., with three white ribs that broaden towards the apex; embryo not examined. Photosynthetic pathway inferred from anatomy to be C3. 1C = 0.39 pg. [details]Diagnosis Related to Morelotia Gaudich., Xyroschoenus Larridon and Tetraria P.Beauv., but distinguished from all of these genera by the combination of the spikelet prophyll below spikelet apparently absent; spikelets 12–22 mm long, with 10–14 glumes and 4 bisexual flowers; perianth absent; and anthers 7–10 mm long. There are superficial morphological similarities to the larger New Caledonian species of Tetraria, including T. comosa (C.B.Clarke) T.Koyama and T. raynaliana Larridon.
[details]
Etymology From the Greek ammos (sand) and thryon (rush), [neuter] in reference to the habitat of this genus, in sandy heath and woodland. [details]
To European Nucleotide Archive, ENA (Ammothryon)
To Genbank
To International Plant Names Index (IPNI)
To Plants of the World Online
To Genbank
To International Plant Names Index (IPNI)
To Plants of the World Online
From editor or global species database
Image from typetaxon
