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Broadleaf Sedge

Carex platyphylla J. Carey

Description

provided by eFloras
Plants densely cespitose. Culms lateral, ascending, lax, or decumbent, very slender, 14–38 cm × 0.2–0.5 mm. Leaves: basal sheaths white or light brown; sheaths green, lighter to white at base, 1–22 mm; blades erect, ascending, or lax, grayish blue-green, midrib strongly developed, 2 lateral veins developed, 5–22 cm × (7–)11–28 mm, older leaves shriveling or dead at tips. Inflorescences: spikes (2–)3(–4) per culm, scattered; peduncles of pistillate spikes exserted 0–2.2 cm; of staminate spikes 0.1–0.8 cm; bracts from middle and proximal portions of culms 1.4–5.2 cm × 2–6 mm. Pistillate spikes: the proximal basal, erect, 6–16 × 2.8–3.8 mm. Staminate spike 1, linear-clavate, 6–14 × 2–4 mm. Pistillate scales keeled, 3–6 × 1.8–2.2 mm, midribs green, margins hyaline or brown tinged outward, apex apicluate or aristate, awn to 2 mm. Staminate scales obovate, 2.7–5 × 1.8–2.2 mm, midribs green, margins hyaline and brownish to purple tinged outward, apex obtuse to acute. Anthers 3.3–4 mm. Perigynia 2–9 per spike, overlapping, ascending, finely many-veined, obovoid, 3–3.2 × 1.8–2 mm; beak short curved. Achenes ovoid, 2.8–3 × 1.6–1.8 mm, slightly concave at maturity, tightly fitting in perigynia. Style ascending through entire orifice. 2n = 68, 70, n = 32 + (3), 33 + (3), 33 + (4).
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 443, 448 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Distribution

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N.B., Ont., Que.; Conn., Del., D.C., Ind., Ky., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., Tenn., Vt., Va., W.Va., Wis.
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 443, 448 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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eFloras

Flowering/Fruiting

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Fruiting spring.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 443, 448 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
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eFloras

Habitat

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Rich, moist deciduous forests, on rocky or gravelly slopes, soils above limestone, shale, or calcareous metamorphic rocks, often on clay soils; 100–1100m.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 23: 443, 448 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
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eFloras

Comprehensive Description

provided by North American Flora
Carex platyphylla Carey, Am. Jour. Sci. II. 4: 23. 1847
"Carex plantaginea Lam." Michx. Fl. Bor. Am. 2: 173. 1803. Carex anceps Muhl. var. latifolia Boott, 111. Carex 1: 39, as synonym. 1858. Carex digitalis var. latifolia A. Gray; Boott, 111. Carex 1: 39, as synonym. 1858. Carex platyphylla var. Dudley, Bull. Cornell Univ. 2: 115. 1886. (Type from Cayuga Lake, New York.)
Densely cespitose, the rootstocks very short, the culms lateral, very numerous, slender, erect or ascending or at length decumbent, 15-30 cm. high, asperulous, triangular, not winged, much exceeding the leaves, yellowish-brown at base, the basal sheaths edged with cinnamonbrown ; sterile shoots reduced to tufts of leaves or nearly so ; foliage glaucous, the basal blades and those of the sterile culms 1-2 dm. long, 9-25 mm. wide, flat, thin, but long-persistent, strongly nerved, the midnerve strongly developed on the lower and the two mid-lateral nerves on the upper surface, acute, minutely roughened on the margins, but otherwise very glabrous, prominently reticulate-veined; blades of fertile culms 5 cm. long or less and 5 mm. wide or less, their sheaths 2-5 cm. long, conspicuously white-hyaline ventrally, red-dotted towards the mouth, prolonged upward beyond base of blade and continuous with the long ligule; staminate spike linear-clavate, shortto long-peduncled, 8-15 mm. long, 1.5-2.5 mm. wide, the scales obovate, obtusish or acutish with 3-nerved green center and white-hyaline margins, usually strongly reddish-brown-tinged; pistillate spikes usually 2-4, widely separated, the lower nearly basal, on short, erect, slender, rough peduncles, exserted 1 cm. long or less, or not exserted, linear-oblong, 1-2.5 cm. long, 4-5 mm. wide, loosely and alternately 4—10flowered; bracts leaflet-like, exceeded by the culms, exceeding their own spikes; long-sheathing, the sheaths entire or undulate on the margins, not purple-tinged; scales ovate or obovate, white-hyaline with green midrib, more or less cinnamon-brown-tinged, short-awned, cuspidate, or acuminate, narrower and shorter than the perigynia; perigynia obovoid, appressed-ascending, early deciduous, not at all inflated, sharply triangular, 2.5-3.5 mm. long, 1.75 mm. wide, finely but not conspicuously many-nerved, minutely asperulous, membranaceous, olivegreen, short-stipitate, tapering at base, tapering at apex into a short, erect or slightly excurved beak, with entire hyaline orifice ; achenes broadly oval, sharply triangular with deeply concave sides, closely filling the perigynium, 2.5 mm. long, 1.5 mm. wide, short-stipitate, short-apiculate, jointed with the short, slender, deciduous style; stigmas three, slender, 2.5 mm. long.
Type locality: "Hab. in declivibus umbrosis, Nov. Angl. et Nov. Ebor."
Distribution: Dry open, wooded slopes, Quebec and Ontario, and southward to North Carolina
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bibliographic citation
Kenneth Kent Mackenzie. 1935. (POALES); CYPERACEAE; CARICEAE. North American flora. vol 18(5). New York Botanical Garden, New York, NY
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Carex platyphylla

provided by wikipedia EN

Carex platyphylla, called the broad leaf sedge and silver sedge, is a species of flowering plant in the genus Carex, native to southeast Canada, and the north-central and eastern United States.[2][3] It is often found in the same forests as Carex plantaginea, also a broad-leaved species, but they do not compete, as C. plantaginea prefers wet areas and C. platyphylla prefers it dry.[4] Silver sedge is considered a useful native ornamental, since it is showy, deer-resistant, and able to tolerate both deep shade and drought once established.[3]

References

  1. ^ Amer. J. Sci. Arts, ser. 2, 4: 23 (1847)
  2. ^ a b "Carex platyphylla J.Carey". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2017. Retrieved 6 January 2021.
  3. ^ a b "Carex platyphylla". North Carolina Extension Gardener Plant Toolbox. N.C. Cooperative Extension. 2021. Retrieved 6 January 2021.
  4. ^ Handel, Steven N. (1978). "The Competitive Relationship of Three Woodland Sedges and its Bearing on the Evolution of Ant-Dispersal of Carex pedunculata". Evolution. 32 (1): 151–163. doi:10.2307/2407416. JSTOR 2407416. PMID 28564097.
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Carex platyphylla: Brief Summary

provided by wikipedia EN

Carex platyphylla, called the broad leaf sedge and silver sedge, is a species of flowering plant in the genus Carex, native to southeast Canada, and the north-central and eastern United States. It is often found in the same forests as Carex plantaginea, also a broad-leaved species, but they do not compete, as C. plantaginea prefers wet areas and C. platyphylla prefers it dry. Silver sedge is considered a useful native ornamental, since it is showy, deer-resistant, and able to tolerate both deep shade and drought once established.

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