Cyperaceae taxon details
Carex geographica B.A.Ford & J.R.Starr
1677784 (urn:lsid:marinespecies.org:taxname:1677784)
accepted
Species
terrestrial
Ford, B. A.; Starr, J. R.; Thanh, N. T. K.; Tài, V. A. (2017). Two Extraordinary New Pseudopetiolate Carex Species from Vietnam (sect. Hemiscaposae, Cyperaceae). Systematic Botany, 42(3): 402-417., available online at https://doi.org/10.1600/036364417X695998
page(s): 414 [details]
page(s): 414 [details]
Holotype WIN, geounit Vietnam
Holotype WIN, geounit Vietnam [details]
Description Plants rhizomatous with stout, pale brown woody rhizomes and pale brown woody roots. Culms pseudolateral, 86–691...
Description Plants rhizomatous with stout, pale brown woody rhizomes and pale brown woody roots. Culms pseudolateral, 86–691 30.7–1.0 mm, ca. half the height of fully developed basal leaves, weakly trigonous, smooth, sometimes minutely scabrous below lowermost bract, with brown, minutely scabrous cataphylls with stramineous veins. Leaves basal and cauline. Basal leaves pseudopetiolate, appearing singly from the rhizome, 340–932 mm long; pseudopetiole 105–405 3 1.6–3.8 mm, glabrous, channeled; blades 225–558 3 26–79 mm, plicate, oblanceolate with caudate apices, dull green to yellow green, 90–170 veined, abaxial surfaces minutely scabrous, adaxial surfaces smooth, margins smooth or minutely scabrous; leaf sheaths highly friable and frequently missing, when present up to 210 mm long, loosely enveloping the pseudopetiole, scabrous, brown. Cauline leaves 25–54 mm long, spathelike, reduced to brown, scabrous 6 bladeless sheaths, similar in morphology to bracts. Inflorescences 154–307 mm long, occupying 30–66% of culm height, lowest two inflorescence units 50–110 mm apart, with upper units more proximate; inflorescence units 1–2 per node on erect, scabrous peduncles; lowermost peduncles 31–60 mm long, the uppermost becoming progressively shorter, 3–14 mm long; lowermost bracts 35–53 mm long, spathelike, reduced to green (–pink-red), pubescent/scabrous 6 bladeless sheaths, similar in morphology to cauline leaves, uppermost reduced in size but otherwise similar, 6–26 mm long. Inflorescence units androgynous, linear-cylindric; lateral inflorescence units simple, with 1 primary branch (5 lateral order), 10–28 3 2.5–6.5 mm; staminate portion 7.5–14 3 (1.5–)2.0–3.5 mm, 25–40 flowered; pistillate portion 6–10 flowered, shorter than staminate region; terminal inflorescence units smaller than lateral units, often compound with second order branches arising from inflorescence prophylls similar in morphology to perigynia. Staminate scales 3.1–4.5 3 0.7–1.2 mm, narrowly oblong to lanceolate, with an obtuse apex, pubescent, pink-red to pinkbrown (often drying brown) with green center, 3-veined with additional faint nerves sometimes present. Stamens with anthers 1.6–2.5 mm long; filaments 6 terete, arching and are exserted from scales after anthesis. Pistillate scales (2.7–)3.1–4.0 3 0.8–1.9 mm, ovate to lanceolate, with an obtuse apex, pubescent, pink-red to pink-brown (often drying brown) with green center, 3-veined with additional faint nerves sometimes present. Perigynia often poorly developed; mature perigynia 3.6–4.3 3 1.2–1.9 mm, longer than the subtending scales, concavely trigonous, ascending, pink-red to pink-brown (often drying brown), pubescent, short stipitate, 4–11 veins but often faintly nerved on adaxial face; body ovoid-ellipsoid, contracting into a beak; beaks 1.1–1.5 mm smooth, apex 6 truncate to shallowly bidentate. Achenes 2.2–2.5 3 1.2–1.9 mm, concavely trigonous, tightly enveloped by the perigynium, ovate, yellowish green to brown. Styles withering but persistent, dark brown, minutely papillose, dilated at point of attachment with achene; stigmas 3, dark brown, minutely papillose, filiform, reflexed. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Carex geographica B.A.Ford & J.R.Starr. Accessed at: https://cyperaceae.org/aphia.php?p=taxdetails&id=1677784 on 2025-09-13
Date
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by
2024-12-10 11:47:54Z
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Nomenclature
original description
Ford, B. A.; Starr, J. R.; Thanh, N. T. K.; Tài, V. A. (2017). Two Extraordinary New Pseudopetiolate Carex Species from Vietnam (sect. Hemiscaposae, Cyperaceae). Systematic Botany, 42(3): 402-417., available online at https://doi.org/10.1600/036364417X695998
page(s): 414 [details]
basis of record Plants of the World Online (POWO). , available online at https://powo.science.kew.org/ [details]
page(s): 414 [details]
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
Holotype WIN, geounit Vietnam [details]
From editor or global species database
Description Plants rhizomatous with stout, pale brown woody rhizomes and pale brown woody roots. Culms pseudolateral, 86–691 30.7–1.0 mm, ca. half the height of fully developed basal leaves, weakly trigonous, smooth, sometimes minutely scabrous below lowermost bract, with brown, minutely scabrous cataphylls with stramineous veins. Leaves basal and cauline. Basal leaves pseudopetiolate, appearing singly from the rhizome, 340–932 mm long; pseudopetiole 105–405 3 1.6–3.8 mm, glabrous, channeled; blades 225–558 3 26–79 mm, plicate, oblanceolate with caudate apices, dull green to yellow green, 90–170 veined, abaxial surfaces minutely scabrous, adaxial surfaces smooth, margins smooth or minutely scabrous; leaf sheaths highly friable and frequently missing, when present up to 210 mm long, loosely enveloping the pseudopetiole, scabrous, brown. Cauline leaves 25–54 mm long, spathelike, reduced to brown, scabrous 6 bladeless sheaths, similar in morphology to bracts. Inflorescences 154–307 mm long, occupying 30–66% of culm height, lowest two inflorescence units 50–110 mm apart, with upper units more proximate; inflorescence units 1–2 per node on erect, scabrous peduncles; lowermost peduncles 31–60 mm long, the uppermost becoming progressively shorter, 3–14 mm long; lowermost bracts 35–53 mm long, spathelike, reduced to green (–pink-red), pubescent/scabrous 6 bladeless sheaths, similar in morphology to cauline leaves, uppermost reduced in size but otherwise similar, 6–26 mm long. Inflorescence units androgynous, linear-cylindric; lateral inflorescence units simple, with 1 primary branch (5 lateral order), 10–28 3 2.5–6.5 mm; staminate portion 7.5–14 3 (1.5–)2.0–3.5 mm, 25–40 flowered; pistillate portion 6–10 flowered, shorter than staminate region; terminal inflorescence units smaller than lateral units, often compound with second order branches arising from inflorescence prophylls similar in morphology to perigynia. Staminate scales 3.1–4.5 3 0.7–1.2 mm, narrowly oblong to lanceolate, with an obtuse apex, pubescent, pink-red to pinkbrown (often drying brown) with green center, 3-veined with additional faint nerves sometimes present. Stamens with anthers 1.6–2.5 mm long; filaments 6 terete, arching and are exserted from scales after anthesis. Pistillate scales (2.7–)3.1–4.0 3 0.8–1.9 mm, ovate to lanceolate, with an obtuse apex, pubescent, pink-red to pink-brown (often drying brown) with green center, 3-veined with additional faint nerves sometimes present. Perigynia often poorly developed; mature perigynia 3.6–4.3 3 1.2–1.9 mm, longer than the subtending scales, concavely trigonous, ascending, pink-red to pink-brown (often drying brown), pubescent, short stipitate, 4–11 veins but often faintly nerved on adaxial face; body ovoid-ellipsoid, contracting into a beak; beaks 1.1–1.5 mm smooth, apex 6 truncate to shallowly bidentate. Achenes 2.2–2.5 3 1.2–1.9 mm, concavely trigonous, tightly enveloped by the perigynium, ovate, yellowish green to brown. Styles withering but persistent, dark brown, minutely papillose, dilated at point of attachment with achene; stigmas 3, dark brown, minutely papillose, filiform, reflexed. [details]
