Cyperaceae taxon details
Tricostularia davisii R.L.Barrett & K.L.Wilson
1751736 (urn:lsid:marinespecies.org:taxname:1751736)
accepted
Species
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): 120 [details] Available for editors
[request]
page(s): 120 [details] Available for editors
[request]
Holotype PERTH
04423186, geounit Western Australia
04423186, geounit Western Australia
Holotype PERTH
04423186, geounit Western Australia [details]
04423186, geounit Western Australia [details]
Description Perennial tufted herb, 0.1–0.6 m high; plants clonal, forming dense tussocks 0.15–0.7 m across; rhizome thin, woody,...
Description Perennial tufted herb, 0.1–0.6 m high; plants clonal, forming dense tussocks 0.15–0.7 m across; rhizome thin, woody, short, branched, 0.8–1.2 mm diam., non-pseudobulbous; old leaf sheaths covering the rhizome, not breaking apart into fine fibres with age, pale brown; roots sand-binding. Culms slender, rigid, erect, with 2 nodes, ± terete but very finely and irregularly ridged when dry, 0.35–0.8 mm diam., smooth, glabrous, green to yellow-green. Leaves mostly basal, few, and 2 cauline; phyllotaxy loosely spirotristichous; sheath 13–25 mm long, 0.5–0.8 mm wide, broader than the leaf lamina, margins very finely scabrid, otherwise glabrous, straw-coloured to brown, dull, upper margin narrowly membranous, oblique, finely ciliate, ligule absent; cauline sheath tight around culm for most of length, but open at the orifice; pseudopetiole obscure or absent; basal leaves with a much reduced lamina, not exceeding the culms, lamina dorsiventral, 0.3–1.0 cm long, 0.1–0.3 mm wide; bases not membranous, not dividing; lamina ± linear, ± flat, flexuous, finely multi-striate, margins and keel finely scabrid, otherwise glabrous, brown, concolorous, weakly keeled along mid-nerve, margins not recurved, apex long-attenuate, setaceous; lowest leaves reduced to a sheath, lacking a lamina, pale brown. Inflorescence subcapitate, much-contracted, panicle-like, obconic to obovate, with 3–5 nodes (but very compact and all nodes obscured by bracts), 0.7–1.5 cm long, 3–5 mm wide, not interrupted, axis green or yellow-green, not glaucous; bracts not leaf-like, long-attenuate (sometimes almost pungent), shortly to greatly exceeding the spikelet clusters, sheaths open, overlapping but not enveloping the higher bracts, gradually reducing along the inflorescence, basal bract exceeding inflorescence, to 15 mm long; branches erect, 0.5–1.1 cm long, with 1 or 2 spikelets in a terminal cluster, spikelet(s) on short, terete, glabrous peduncles 0.2–0.8 mm long, arising in each bract axil; spikelet prophyll present, sheath 0.6–0.9 mm long, brown, not enclosing the spikelet, acuminate, lamina ± absent. Spikelets brown, lanceolate, 3.7–5.1 mm long, 0.9–0.1.1 mm wide, semi-terete to compressed, with 6 glumes, only topmost 2 fertile, the lower flower male, the upper flower bisexual, fertile, no reduced glume above the florets; glumes distichous, basal glume 2.9–4.2 mm long, fertile glumes 3.2–4.2 mm long, 0.7–0.9 mm wide, membranous, very pale red-brown (apex often darker than body), ciliate on the keel and margins, lamina glabrous, lanceolate to obovate, acuminate, with a mucro 0.2–0.6 mm long, keel distinct; rachilla compact and not or scarcely sinuous in fruiting spikelets. Perianth segments 6, whitish, minute, 0.4–0.6 mm long, expanded only at base, tapering to a fine point, glabrous or apex minutely hispid. Stamens 3; anther connective 3.3–4.6 mm long, subulate; anthers cream, 2.4–2.6 mm long, with a glabrous apical appendage 0.6–0.8 mm long. Style trifid, base 1.2–2.0 mm long, glabrous, slender above, not dilated below, branches 1.4–1.9 mm long, hispidulous. Nutlet shortly stipitate, stipe c. 0.5 mm long, somewhat constricted, obovoid to obpyriform or broad ellipsoid, obscurely trigonous, shiny, dark brown to almost black, 1.2–1.7 mm long including the stipe and style base, 0.8–1.0 mm diam., faces smooth, sparsely puberulous, epidermal cells square–hexagonal, inconspicuous, with three fine white ribs, style base not enlarged, cap-like; embryo not examined. Photosynthetic pathway not examined. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Tricostularia davisii R.L.Barrett & K.L.Wilson. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1751736 on 2025-09-13
Date
action
by
2024-12-10 11:47:54Z
unchecked
db_admin
The webpage text is licensed under a Creative Commons
Attribution 4.0 License
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): 120 [details] Available for editors [request]
page(s): 120 [details] Available for editors
[request]
Present Inaccurate Introduced: alien Containing type locality
Holotype PERTH
04423186, geounit Western Australia [details]
04423186, geounit Western Australia [details]
From editor or global species database
Description Perennial tufted herb, 0.1–0.6 m high; plants clonal, forming dense tussocks 0.15–0.7 m across; rhizome thin, woody, short, branched, 0.8–1.2 mm diam., non-pseudobulbous; old leaf sheaths covering the rhizome, not breaking apart into fine fibres with age, pale brown; roots sand-binding. Culms slender, rigid, erect, with 2 nodes, ± terete but very finely and irregularly ridged when dry, 0.35–0.8 mm diam., smooth, glabrous, green to yellow-green. Leaves mostly basal, few, and 2 cauline; phyllotaxy loosely spirotristichous; sheath 13–25 mm long, 0.5–0.8 mm wide, broader than the leaf lamina, margins very finely scabrid, otherwise glabrous, straw-coloured to brown, dull, upper margin narrowly membranous, oblique, finely ciliate, ligule absent; cauline sheath tight around culm for most of length, but open at the orifice; pseudopetiole obscure or absent; basal leaves with a much reduced lamina, not exceeding the culms, lamina dorsiventral, 0.3–1.0 cm long, 0.1–0.3 mm wide; bases not membranous, not dividing; lamina ± linear, ± flat, flexuous, finely multi-striate, margins and keel finely scabrid, otherwise glabrous, brown, concolorous, weakly keeled along mid-nerve, margins not recurved, apex long-attenuate, setaceous; lowest leaves reduced to a sheath, lacking a lamina, pale brown. Inflorescence subcapitate, much-contracted, panicle-like, obconic to obovate, with 3–5 nodes (but very compact and all nodes obscured by bracts), 0.7–1.5 cm long, 3–5 mm wide, not interrupted, axis green or yellow-green, not glaucous; bracts not leaf-like, long-attenuate (sometimes almost pungent), shortly to greatly exceeding the spikelet clusters, sheaths open, overlapping but not enveloping the higher bracts, gradually reducing along the inflorescence, basal bract exceeding inflorescence, to 15 mm long; branches erect, 0.5–1.1 cm long, with 1 or 2 spikelets in a terminal cluster, spikelet(s) on short, terete, glabrous peduncles 0.2–0.8 mm long, arising in each bract axil; spikelet prophyll present, sheath 0.6–0.9 mm long, brown, not enclosing the spikelet, acuminate, lamina ± absent. Spikelets brown, lanceolate, 3.7–5.1 mm long, 0.9–0.1.1 mm wide, semi-terete to compressed, with 6 glumes, only topmost 2 fertile, the lower flower male, the upper flower bisexual, fertile, no reduced glume above the florets; glumes distichous, basal glume 2.9–4.2 mm long, fertile glumes 3.2–4.2 mm long, 0.7–0.9 mm wide, membranous, very pale red-brown (apex often darker than body), ciliate on the keel and margins, lamina glabrous, lanceolate to obovate, acuminate, with a mucro 0.2–0.6 mm long, keel distinct; rachilla compact and not or scarcely sinuous in fruiting spikelets. Perianth segments 6, whitish, minute, 0.4–0.6 mm long, expanded only at base, tapering to a fine point, glabrous or apex minutely hispid. Stamens 3; anther connective 3.3–4.6 mm long, subulate; anthers cream, 2.4–2.6 mm long, with a glabrous apical appendage 0.6–0.8 mm long. Style trifid, base 1.2–2.0 mm long, glabrous, slender above, not dilated below, branches 1.4–1.9 mm long, hispidulous. Nutlet shortly stipitate, stipe c. 0.5 mm long, somewhat constricted, obovoid to obpyriform or broad ellipsoid, obscurely trigonous, shiny, dark brown to almost black, 1.2–1.7 mm long including the stipe and style base, 0.8–1.0 mm diam., faces smooth, sparsely puberulous, epidermal cells square–hexagonal, inconspicuous, with three fine white ribs, style base not enlarged, cap-like; embryo not examined. Photosynthetic pathway not examined. [details]
