Cyperus hermaphroditus |
Cyperus filiformis |
|
---|---|---|
hermaphrodite flatsedge |
wiry flatsedge |
|
Habit | Herbs, perennial, rhizomatous. | Herbs, perennial. |
Culms | trigonous, (10–)30–80(–140) cm × (0.4–)1–3(–5) mm, glabrous. |
trigonous, 20–36 cm × 0.5–1 mm. |
Leaves | V-shaped or flanged V-shaped, (5–)15–70(–90) cm × (2–)4–10(–13) mm, glabrous. |
flat, 4–22 cm × 1–2 mm. |
Inflorescence(s) | spikes 1(–5), rather densely ovoid or oblong-cylindric, (10–)25–45(–62) × 7–22 mm, 11–21 spikelets per 5 mm of rachis; rays (3–)5–10(–17), (1–)5–12(–24) cm; bracts (2–)4–8, ascending at 30–45°, V- or inversely W-shaped, (2–)8–40(–65) cm × (1–)2–8 mm; rachilla deciduous, wings 0.4–0.5 mm wide. |
a single loose cluster of spikelets; rays 0–(1–2), if present, to 4 cm; bracts 2–3, ascending, 1–8 cm × 0.7–1 mm; rachilla with wings 0.6 mm wide. |
Spikelets | (10–)50–150, oblong to linear, quadrangular, (3–)4–8(–18) × (0.8–)1–1.2(–1.6) mm; distal spikelet spreading or ascending; floral scales (1–) 3–8, pale greenish white to golden brown, deep brown, or reddish brown, medially usually green, weakly to strongly 3(–4)-ribbed laterally, 1–3-ribbed medially, ovate to elliptic, (2–)2.6–3.2(–4) × 1.2–2 mm, apex obtuse. |
2–8, linear, terete, 6–20 × 0.7–1 mm; floral scales 6–10, medially green, laterally brown, medially faintly 3-ribbed, laterally faintly 3–5-ribbed, ovate, 2.5–3 × 2 mm. |
Flowers | anthers (0.4–)0.6–1 mm; styles 0.4–1.6 mm; stigmas 1–1.5 mm. |
anthers 1 mm; styles 0.5 mm; stigmas 1 mm. |
Achenes | brown or reddish brown, sessile or nearly so, ellipsoid, 1.4–1.8(–2) × 0.6–0.8(–1) mm, apex acute to obtuse, slightly apiculate, surfaces puncticulate. |
black, sessile, obovoid, 2 × 0.8 mm, apex scarcely apiculate, surfaces puncticulate. |
Cyperus hermaphroditus |
Cyperus filiformis |
|
Phenology | Fruiting summer–fall. | Fruiting spring–fall. |
Habitat | Arroyos | Damp, disturbed places |
Elevation | 500–1200 m (1600–3900 ft) | 0–20 m (0–100 ft) |
Distribution |
AZ; TX; Mexico; South America; West Indies |
FL; West Indies |
Discussion | An erroneous report of Cyperus hermaphroditus from Alabama was based on misidentification of C. thyrsiflorus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 186. | FNA vol. 23. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Diclidium |
Sibling taxa | ||
Synonyms | Carex hermaphrodita, Mariscus hermaphroditus, Mariscus jacquinii | C. floridanus, Mariscus filiforme, Mariscus floridensis, Torulinium filiforme |
Name authority | (Jacquin) Standley: Contr. U.S. Natl. Herb. 18: 88. (1916) | Swartz: Prodr., 20. (1788) |
Web links |