Cyperus houghtonii |
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Houghton's flatsedge |
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Habit | Herbs, perennial, cespitose, bases cormose, rhizomatous. |
Culms | trigonous, 5–50 cm × 0.5–1.5 mm, glabrous. |
Leaves | V-shaped, 12–30 cm × 1–6 mm. |
Inflorescences | spikes ± globose to broadly ovoid, 8–20 mm wide; rays 1–8 cm; rachis 2–5 mm, glabrous; bracts 3–8, weakly ascending, flat, 3–20 cm × 1–3.5 mm; rachilla deciduous, wingless. |
Spikelets | 3–18, compressed, ovoid to oblong-lanceoloid, 4–15 × 2.6–3.4 mm; floral scales deciduous, 3–18, laterally stramineous to reddish brown, laterally 3–4-ribbed, broadly ovate, 1.8–2.5 × 1.3–1.6 mm, apex with mucro 0.1–0.2 mm. |
Flowers | anthers 0.5–0.7 mm; styles 0.4–0.6 mm; stigmas 1–1.5 mm. |
Achenes | dark brown, sessile, broadly ellipsoid, 1.5–2 × 1–1.5 mm, apex obtuse, apiculate, surface glabrous, puncticulate, or papillose. |
2n | = 168, 170, 172. |
Cyperus houghtonii |
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Phenology | Fruiting summer. |
Habitat | Riverbanks, sand bars, lakeshores, sand dunes, sandy openings in woods, especially among Jack pines |
Elevation | 0–1100 m (0–3600 ft) |
Distribution |
IL; IN; MA; MD; ME; MI; MN; NH; NJ; NY; OH; PA; VA; VT; WI; WV; MB; ON; QC
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Source | FNA vol. 23, p. 175. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | |
Name authority | Torrey: Ann. Lyceum Nat. Hist. New York 3: 277. (1836) |
Web links |