Scirpus divaricatus Elliott

Spreading bulrush (en)

Species

Angiosperms > Poales > Cyperaceae > Scirpus

Characteristics

Plants cespitose; rhizomes not apparent. Culms: fertile ones lax, reclining, inflorescences lopping over to (or nearly to) ground; nodes frequently with axillary bulblets. Leaves 10–18 per culm; proximal leaf sheaths green or brownish; proximal sheaths and blades with septa few, inconspicuous; blades 16–55 cm × 4–8 mm. Inflorescences terminal; rays divergent, proximal rays smooth, pedicels and distal rays scabrous, rays often bearing axillary bulblets; bases of involucral bracts green or brownish, not glutinous. Spikelets in open cymes, central spikelet of each cyme sessile, others long-pedicellate, spikelets cylindric to narrowly ovoid, 4–14 × 1–2 mm; scales light brown to reddish with broad green midribs, broadly ovate or elliptic, 1.2–1.8 mm, apex rounded to obtuse, apiculate, or sometimes short-mucronate, apiculus or mucro (if present) to 0.1 mm. Flowers: perianth bristles persistent, 6, stout, contorted, equaling or longer than achene, not projecting beyond it, with delicate, round-tipped, retrorse teeth in distal 1/2, enclosed within scales; styles 3-fid. Achenes off-white to yellowish brown, elliptic-obovate in outline, strongly trigonous with very strong angles and concave sides, 0.8–1 × 0.6–0.8 mm. 2n = 28.
More
Cespitose perennial; stems slender and weak, to 1.5 m, often lopping over to the ground, often with bulblets at the nodes; lvs 10–20, mostly 5–10 mm wide; infl large and lax, often bearing tufts of lvs; spikelets cylindric, to 1 cm, individually pedicellate; scales numerous, in few rows on the rachilla, broadly ovate, with green midrib and pale or hyaline sides; bristles 6, ca equal to achene, contorted, retrorsely barbellate above the middle; achenes 1 mm, elliptic or obovate, trigonous with protruding angles and concave sides; 2n=28. Swamps and wet woods; n. Fla. to La., n. to se. Va., s. Tenn., and se. Mo. Fr May, June.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
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Root system rhizome
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Environment

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Hardiness (USDA) 4-10

Usage

Uses -
Edible -
Therapeutic use -
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Animal toxicity -

Cultivation

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Distribution

Scirpus divaricatus world distribution map, present in Åland Islands, Georgia, Nicaragua, and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:313503-1
WFO ID wfo-0000537489
COL ID 4VLY3
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Isolepis divaricata Scirpus divaricatus Scirpus ambiguus