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annual greenhead sedge, low spikesedge

Asiatic greenhead sedge, pasture greenhead-sedge, pasture spikesedge

Habit Herbs, annual, cespitose, not rhizomatous. Plants perennial, not cespitose, long-creeping rhizomatous.
Culms

(5–)15–30(–55) cm, smooth.

10–35(–50) cm, smooth.

Leaves

flat to V-shaped, 4–20(–30) cm × 1.5–3(–3.6) mm.

flat, 10–30 cm × 1–3.5 mm.

Inflorescences

spikes 1–3, pale greenish, (3–)5–8(–11) × 5–7 mm;

bracts (3–) 4(–5), horizontal to ascending at 30°, flat, (1–)3–10(–22) cm × 1–2.5(–3) mm.

spike 1, ovoid, 7–12 × 6–10 mm;

bracts 3–4, horizontal to slightly reflexed, flat, 2–20(–30) cm × 1–3 mm.

Spikelets

50–150, lanceolate to ovate-lanceolate, (1.9–)2.4–2.8(–3.8) × 0.6–0.9 mm;

floral scales pale brownish to transparent, midvein not winged, laterally 2–3(–4)-veined, ovate, (1.8–)2.2–3.1(–3.4) × 1–1.7 mm;

stamens 2;

anthers elliptic, (0.2–)0.3–0.4 mm;

style 0.5–0.8 mm;

stigmas 0.5–0.9 mm.

40–80, pale greenish or reddish brown, ovate, 3.5–4.5 × 1.2–1.3(–1.4) mm;

floral scales laterally 2(–5)-veined, elliptic, 1.8–3.2 × 1–1.6 mm, apex mucronate;

stamens 2–3;

anthers 0.8–1.1 mm;

style 1.8–2.2 mm;

stigmas 0.5–1 mm.

Achenes

light brown, stipitate, oblong, 1–1.2(–1.4) × 0.5–0.6(–0.7) mm, base cuneate to rounded, stipe to 0.1 mm, apex subtruncate, apiculate, finely papillose.

brown, sessile or stipitate, broadly ellipsoid, 1.5–1.8 × 0.8–1 mm, stipe, if present, to 0.1 mm, apex obtuse, apiculate, puncticulate.

Kyllinga pumila

Kyllinga gracillima

Phenology Fruiting summer. Fruiting summer.
Habitat Damp grasslands, shorelines, ditches, lawns, gardens Muddy banks of streams and estuaries
Elevation 0–200 m (0–700 ft) 0–1000 m (0–3300 ft)
Distribution
from FNA
AL; AR; DE; FL; GA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WV; Mexico; Central America; South America; West Indies; Africa
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CT; DE; GA; KY; MD; MS; NC; NJ; NY; PA; TN; VA; temperate e Asia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 23, p. 194. FNA vol. 23, p. 194.
Parent taxa Cyperaceae > Kyllinga Cyperaceae > Kyllinga
Sibling taxa
K. brevifolia, K. gracillima, K. odorata, K. squamulata
K. brevifolia, K. odorata, K. pumila, K. squamulata
Synonyms Cyperus densicaespitosus, Cyperus tenuifolius, K. tenuifolia Cyperus brevifolioides, K. brevifolia var. gracillima, K. brevifolioides
Name authority Michaux: Fl. Bor.-Amer. 1: 28. (1803) Miquel: Ann. Mus. Bot. Lugduno-Batavi 2: 142. (1866)
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