Carex madrensis L. H. Bailey

Carex madrensis L. H. Bailey, Bot. Gaz. 25: 270. 1898
Carex polystachya var. madrensis Kiikenth. in Engler, Pflanzenreich, 4=°: 267. 1909. (Based on C. madreyisis L. H. Bailey.)
Clumps medium-sized or large, from densely matted, woody rootstocks, the culms 2.5-6 dm. high, slender, obtusely triangular, smooth, phyllopodic, much exceeding the leaves, strongly brownish-tinged and strongly fibrillose at base ; leaves (not bracts) with well-developed blades 5-10 to a fertile culm, the lower clustered, the upper regularly separated, the blades flat with revolute margins, coriaceous, stiff, light-green, usually 1-2.5 dm. long, 2.5-4 mm. wide, strongly roughened towards the attenuate apex, the midvein prominent below, the sheaths tight, somewhat brownish-tinged ventrally, truncate at mouth and slightly pubescent, the ligule very short; spikes rather few for the group, androgynous, in 1-3 erect peduncled panicles, not in pairs, the lower on slender scabrous peduncles, the panicle bracts leaflet-like, strongly sheathing; panicles ovoid or oblong-ovoid, 1.5-3 cm. long, 7-15 mm. wide, containing 3-6 sessile, simple, appressed-ascending spikes, the rachis hispid; spikes ovoid or oblong-ovoid, 7-15 mm. long, 4-6 mm. wide, closely flowered, containing 5-15 appressed perig>-nia below in several rows and the inconspicuous staminate flowers above, the bracts small, awn-pointed; cladoprophyllum prominent, perigynium-like; pistillate scales broadly ovate, obtuse, acute or the lower cuspidate, chestnut-brown with greenish center and slightly hyaline margins, finely many-striate, the midvein prominent, 2.5-3.5 mm. long, wider but shorter than the mature perigynia; staminate scales similar, but narrower and hardly at all greenish; perigynia 4 mm. long, 1.5 mm. wide, glabrous, the body obovoid, sharply triangular, not inflated, membranaceous, puncticulate, bright-green, finely several-ner-ed, short-stipitate, tapering to a stout spongy base, abruptly contracted at apex into a smooth, minutely bidentate beak 1 mm. long; achenes obovoid, nearly sessile, 2.75 mm. long, 1.25 mm. wide, triangular with concave sides and blunt angles, very closely enveloped, short-apiculate, jointed with the very short, thickish, straight style; stigmas three, slender, reddish-brown.
Type locality: Sierra Madre mountains. State of Durango, Mexico (Rose 2357). Distribution: Dry woodlands, mountains. Durango to Morelos. (Specimens examined from Durango, Morelos.)

Carex madrensis is a tussock-forming species of perennial sedge in the family Cyperaceae. It is native to parts of Mexico.

Carex madrensis adalah spesies tumbuhan seperti rumput yang tergolong ke dalam famili Cyperaceae. Spesies ini juga merupakan bagian dari ordo Poales. Spesies Carex madrensis sendiri merupakan bagian dari genus Carex. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh L.H.Bailey.

Carex madrensis là một loài thực vật có hoa trong họ Cói. Loài này được L.H.Bailey mô tả khoa học đầu tiên năm 1898.