Cyperus cuspidatus |
Cyperus granitophilus |
|
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coastal plain flatsedge |
granite flatsedge |
|
Habit | Herbs, annual, cespitose. | Herbs, annual, cespitose, with roots fibrous. |
Culms | 1–6(–25), trigonous to roundly trigonous, (0.5–)2–5(–9) cm × 0.2–0.4–(0.6) mm, glabrous. |
trigonous, glabrous. |
Leaves | 1–6, V-shaped, 1–6 cm × 0.3–1 mm. |
V-shaped to flat, (2–)4–11 cm × 3–4 mm. |
Inflorescences | heads digitate, loosely ovoid, 3–18 × 3–26 mm; rays (0–)1–6(–8), 2.5–20(–30) mm; bracts 2–3(–5), horizontal to ascending at 45(–60)°, V-shaped, 2–60 × 0.3–1.2 mm. |
rays absent; bracts 2–4, ± horizontal, flat, 1–6.5 cm × 2–3 mm; rachilla persistent, wingless. |
Spikelets | (3–)10–20(–30), greenish to reddish brown, narrowly ellipsoid to oblong, 3–11 × (0.8–)1.2–1.5 mm; floral scales (3–)6–20(–28), laterally greenish to reddish brown, glossy, medially greenish to light reddish brown, strongly recurved, laterally ribless, medially strongly 3-ribbed, oblong-ovate, (0.8–)1–1.3 × 0.8–1(–1.2) mm, apex emarginate, cusp 0.6–1.2 mm. |
10–40, compressed, ovoid to linear-lanceoloid, quadrangular, 5–9 × 2–3 mm; floral scales deciduous, 5–20, spreading, pale greenish to reddish brown, laterally (5–)7–9(–13)-ribbed, ovate, 3–4 × 1–2 mm, apex straight, excurved mucronate, or cuspidate. |
Flowers | stamens 2 or 3; anthers oblong-ovoid, 0.1(–0.2) mm; styles (0.2–)0.4–0.6 mm; stigmas 0.3–0.5 mm. |
stamens 1–2; filaments 1.5 mm; anthers 0.8–1 mm, connective apex reddish yellow, less than 0.1 mm; styles 0.8–1 mm; stigmas 1–1.2 mm. |
Achenes | brown, oblong-obovoid, (0.5–)0.6 × (0.3–)0.4 mm, base cuneate, apex blunt, surfaces coarsely papillose. |
brown to reddish brown, broadly ellipsoid to obovoid, 0.8–1.2 × 0.5–0.6 mm, base ± cuneate, apex truncate-obtuse, surfaces puncticulate. |
Cyperus cuspidatus |
Cyperus granitophilus |
|
Phenology | Fruiting summer. | Fruiting summer. |
Habitat | Damp, disturbed soils | Thin soil over outcrops of granite or sandstone of the Piedmont and inner coastal plain |
Elevation | 0–300 m (0–1000 ft) | 50–400 m (200–1300 ft) |
Distribution |
AL; FL; GA; SC; Mexico; Central America; South America
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AL; GA; NC; SC; TN; VA
|
Discussion | Cyperus granitophilus is documented as an autotetraploid derivative of C. squarrosus (L. W. Garoni and W. H. Murdy 1964). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 158. | FNA vol. 23, p. 165. |
Parent taxa | Cyperaceae > Cyperus > subg. Pycnostachys | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Name authority | Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 1: 204. (1816) | McVaugh: Castanea 2: 103, figs. 4–8. (1937) |
Web links |