Cyperus grayoides |
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Illinois flatsedge, Mohlenbrock's sedge, umbrella sedge |
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Habit | Herbs, perennial, cespitose, rhizomatous, tuberlike. |
Culms | trigonous, 5–35 cm × 0.7–1.2 mm, glabrous. |
Leaves | V-shaped, 5–25 cm × 1.5–3.5 mm, slightly scabridulous on abaxial margins, midrib. |
Inflorescences | spikes loosely ± globose, 15–25 mm wide; rays 1–10 cm; rachis 1–4 mm; bracts 3–7, ascending, V-shaped, 3–20 cm × 1–3 mm; rachilla deciduous, wingless. |
Spikelets | 3–24, compressed, oblong-lanceoloid, 4–12 × 2.5–3.2 mm; floral scales deciduous, 3–9, pale reddish brown, ovate, laterally 3–5-ribbed, 2.5–3 × 2–2.4 mm, apex acute to obtuse. |
Flowers | anthers 1–1.2 mm; styles 0.4–0.6 mm; stigmas 1–2 mm. |
Achenes | dark brown, ± stipitate, ellipsoid, 2–2.4 × 0.9–1.2 mm, apex obtuse, apiculate, surfaces glabrous, puncticulate, or papillose. |
2n | = 166. |
Cyperus grayoides |
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Phenology | Fruiting summer. |
Habitat | Sand prairies, waste places, fallow fields |
Elevation | 100–300 m (300–1000 ft) |
Distribution |
AR; IL; LA; MO; TX
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Discussion | Of conservation concern. Cyperus grayoides is in the Center for Plant Conservation’s National Collection of Endangered Plant’s. See frontispiece. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 23. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | |
Name authority | Mohlenbrock: Brittonia 11: 255, fig. 1. (1959) |
Web links |