Cyperaceae taxon details
Carex austromexicana Reznicek
1677280 (urn:lsid:marinespecies.org:taxname:1677280)
accepted
Species
terrestrial
Reznicek, A. A. (1982). Two new species of <i>Carex</i> (Cyperaceae) from Southern Mexico. <em>Systematic Botany.</em> 7(3): 340-344., available online at https://doi.org/10.2307/2418393
page(s): 340 [details] Available for editors
[request]
page(s): 340 [details] Available for editors
[request]
Holotype MICH 1109121, geounit Oaxaca
Holotype MICH 1109121, geounit Oaxaca [details]
Description Plants cespitose with short rhizomes; roots greyish brown, not densely felted with rootmhairs; fertile culms 40-70 cm tall,...
Description Plants cespitose with short rhizomes; roots greyish brown, not densely felted with rootmhairs; fertile culms 40-70 cm tall, trigonous, smooth, with glabrous, dark purple, bladeless basal sheaths with stramineous veins. Leaves 7-11, mostly basal; blades 10-30 cm long, 3-5.8 mm wide, plicate, glabrous abaxially, antrorsely scabrous adaxially, the margins antorsely scabrous distally, the widest leaves 4.9-5.8 mm wide; leaf sheaths 2-10 cm long, tightly enveloping culms, glabrous, green but at least the lower purple-tinged near base; inner band of sheaths +- hyaline, purple-tinged or purple-dotted, glabrous to finely hispidulous with red to stramineous prickle-hairs, the apex concave; ligules 0.9-2.3 mm long, rounded, the free portion stramineous. Vegetative shoots ca. 15 cm tall; leaves 5-7, similar to those of fertile culms; pseudoculms ca. 2.5-4.5 cm tall. Inflorescences 10-33 cm long, with the upper spikes strongly overlapping and the lowest 2 spikes 4-19 cm distant; spikes single at nodes, erect on stiff, smooth or slightly scabrous peduncles; lowermost spikes with peduncles 2.5-16.5 cm long, the uppermost lateral spikes sessile or with peduncles to 1.8 cm long; lowermost bracts with blades 9-25 cm long and 1.8-4 mm wide and sheaths 1.5-7 cm long, the uppermost bracts much reduced. Spikes 4-6, the terminal staminate, the lateral androgynous or the lower sometimes pistillate. Terminal spikes 1.5-3 cm long, 1.7-3 mm wide, 25-60-flowered; peduncles 3-12 mm long. Lateral spikes 1.2-4.1 cm long, the lowermost sometimes compound, with secondary spikes 1-2, androgynous or pistillate, up to 1.4 cm long; staminate portion of lateral spikes (0-)0.3-0.8 cm long, ca. (0-)4-25 flowered; pistillate portion of lateral spikes 0.9 3.8 cm long, 3.5-5 mm wide, ca. 8-50-flowered. Pistillate scales 2.6-5.9 mm long, 1.5-1.8 mm wide, oblong, obtuse to acute or the lowermost acuminate, glabrous, or scabrous on the veins distally, reddish brown to purple, with hyaline margins and stramineous center, 1(-3)-veined. Staminate scales 3.5-5.7(-6.9) mm long, 1.4-1.6(-2) mm wide, lanceolate to narrowly oblong, obtuse to acute or the lowermost acuminate, glabrous, or scabrous on the veins distally, reddish brown to purple, with hyaline margins and stramineous center, 1(-3)-veined. Perigynia 3.3-4.5 mm long, 0.9-1.3 mm wide, ascending, flattened-trigonous with convex to +- flat, lanceolate to narrowly ovate sides, dark purple distally, green or green and purple mottled proximally, glabrous, sessile or short stipitate, 9-16-veined, tapering to a poorly defined beak; beaks 0.4-1.1 mm long, glabrous or very sparsely scabrous, the apex hyaline and truncate, entire or erose. Achene 1.8-2.4 mm long, 1-1.2 mm wide, flattened-trigonous with convex to +- flat, ovate sides, tightly enveloped by the perigynium, pale brown, short-stipitate. Styles withering; stigmas 3. Anthers 3, 1-1.7 mm long. [details]
Cyperaceae Working Group. (2025). [see How to cite]. Global Cyperaceae Database. Carex austromexicana Reznicek. Accessed at: https://www.cyperaceae.org/aphia.php?p=taxdetails&id=1677280 on 2026-06-29
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2024-12-10 11:47:54Z
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Nomenclature
original description
Reznicek, A. A. (1982). Two new species of <i>Carex</i> (Cyperaceae) from Southern Mexico. <em>Systematic Botany.</em> 7(3): 340-344., available online at https://doi.org/10.2307/2418393
page(s): 340 [details] Available for editors [request]
page(s): 340 [details] Available for editors
[request]Other
additional source
Reznicek, A. A. (1986). The Taxonomy of <i>Carex</i> sect. <i>Hymenochlaenae</i> (Cyperaceae) in Mexico and Central America. <em>Systematic Botany.</em> 11(1): 56-87., available online at https://doi.org/10.2307/2418947
page(s): 60 [details] Available for editors [request]
page(s): 60 [details] Available for editors
[request]
Present Inaccurate Introduced: alien Containing type locality
Holotype MICH 1109121, geounit Oaxaca [details]
From editor or global species database
Comparison details of perigynia, C. austromexicana resembles C. caxinensis and C. flexirostris Reznicek. The species is different in aspect from all other members of sect. Hymenochlaenae in Mexico and Central America because of its erect spikes. The similarity to California species placed by Mackenzie (1935) in sect. Sylvaticae,especially to C. mendocinensis W. Boott, has already been noted (Reznicek 1982). No better sectional placement is presently apparent to me. [details]
Description Plants cespitose with short rhizomes; roots greyish brown, not densely felted with rootmhairs; fertile culms 40-70 cm tall, trigonous, smooth, with glabrous, dark purple, bladeless basal sheaths with stramineous veins. Leaves 7-11, mostly basal; blades 10-30 cm long, 3-5.8 mm wide, plicate, glabrous abaxially, antrorsely scabrous adaxially, the margins antorsely scabrous distally, the widest leaves 4.9-5.8 mm wide; leaf sheaths 2-10 cm long, tightly enveloping culms, glabrous, green but at least the lower purple-tinged near base; inner band of sheaths +- hyaline, purple-tinged or purple-dotted, glabrous to finely hispidulous with red to stramineous prickle-hairs, the apex concave; ligules 0.9-2.3 mm long, rounded, the free portion stramineous. Vegetative shoots ca. 15 cm tall; leaves 5-7, similar to those of fertile culms; pseudoculms ca. 2.5-4.5 cm tall. Inflorescences 10-33 cm long, with the upper spikes strongly overlapping and the lowest 2 spikes 4-19 cm distant; spikes single at nodes, erect on stiff, smooth or slightly scabrous peduncles; lowermost spikes with peduncles 2.5-16.5 cm long, the uppermost lateral spikes sessile or with peduncles to 1.8 cm long; lowermost bracts with blades 9-25 cm long and 1.8-4 mm wide and sheaths 1.5-7 cm long, the uppermost bracts much reduced. Spikes 4-6, the terminal staminate, the lateral androgynous or the lower sometimes pistillate. Terminal spikes 1.5-3 cm long, 1.7-3 mm wide, 25-60-flowered; peduncles 3-12 mm long. Lateral spikes 1.2-4.1 cm long, the lowermost sometimes compound, with secondary spikes 1-2, androgynous or pistillate, up to 1.4 cm long; staminate portion of lateral spikes (0-)0.3-0.8 cm long, ca. (0-)4-25 flowered; pistillate portion of lateral spikes 0.9 3.8 cm long, 3.5-5 mm wide, ca. 8-50-flowered. Pistillate scales 2.6-5.9 mm long, 1.5-1.8 mm wide, oblong, obtuse to acute or the lowermost acuminate, glabrous, or scabrous on the veins distally, reddish brown to purple, with hyaline margins and stramineous center, 1(-3)-veined. Staminate scales 3.5-5.7(-6.9) mm long, 1.4-1.6(-2) mm wide, lanceolate to narrowly oblong, obtuse to acute or the lowermost acuminate, glabrous, or scabrous on the veins distally, reddish brown to purple, with hyaline margins and stramineous center, 1(-3)-veined. Perigynia 3.3-4.5 mm long, 0.9-1.3 mm wide, ascending, flattened-trigonous with convex to +- flat, lanceolate to narrowly ovate sides, dark purple distally, green or green and purple mottled proximally, glabrous, sessile or short stipitate, 9-16-veined, tapering to a poorly defined beak; beaks 0.4-1.1 mm long, glabrous or very sparsely scabrous, the apex hyaline and truncate, entire or erose. Achene 1.8-2.4 mm long, 1-1.2 mm wide, flattened-trigonous with convex to +- flat, ovate sides, tightly enveloped by the perigynium, pale brown, short-stipitate. Styles withering; stigmas 3. Anthers 3, 1-1.7 mm long. [details]
Ecology Carex austromexicana fruits in late July through December and occurs in open, moist pine forest in Oaxaca (fig. 1) at about 2800-3000 m. [details]
