WoRMS taxon details
Ammothryon R.L.Barrett, K.L.Wilson & J.J.Bruhl
terrestrial
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;...
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]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Ammothryon R.L.Barrett, K.L.Wilson & J.J.Bruhl. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1675216 on 2025-04-25
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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]
