Cyperus elegans |
Cyperus grayi |
|
---|---|---|
royal flatsedge, sticky flatsedge |
Gray's flatsedge, Gray's sedge |
|
Habit | Herbs, perennial, cespitose, shortly rhizomatous, coarse, viscous. | Herbs, perennial, cespitose, rhizomatous. |
Culms | round to roundly trigonous, 15–80 cm × 2–4 mm, glabrous. |
basally cormlike, trigonous, 5–40 cm × 0.5–1.3 mm, glabrous. |
Leaves | adaxial face concave, becoming trigonous apically, 15–75 cm × 1–4 mm, margins involute. |
V-shaped, 5–25 cm × 1–3 mm, slightly minutely scabridulous abaxially on margins, midrib. |
Inflorescences | spikes ovoid, 10–20 mm wide; rays 3–8(–10), 0.5–12 cm; 2d order rays 0–3, 1–3 cm; bracts 3–7, horizontal to vertical, 2.5–5.5 cm × 1–4 mm, margins involute; 2d order bracts 0–3, 1–3 cm; rachilla persistent, wingless. |
spikes loosely ± globose, 6–20 mm wide; rays 1–8 cm; rachis 1–4 mm; bracts 3–8, ascending, V-shaped, 3–20 cm × 1–3 mm; rachilla deciduous, wings hyaline, 0.6 mm wide. |
Spikelets | 3–20(–30), beige to greenish or reddish brown, strongly compressed, oblong-ellipsoid to oblong-lanceoloid, 3–15 × 2.5–3.5 mm; floral scales deciduous, 6–22, laterally pale greenish white to stramineous or reddish brown, medially pale green to yellowish green, laterally 2-ribbed, medially 3–5-ribbed, broadly ovate, (2–)2.8–3.6 × 2.4–2.6 mm, apex with slightly excurved mucro 0.2–0.3 mm, apically scabrid. |
3–18(–28), oblong-lanceoloid, compressed, 3–12 × 1.8–2.5 mm; floral scales deciduous, 2–11, yellowish brown to reddish brown, laterally 3–4-ribbed, ovate, 2–2.8 × 1.6–2.2 mm, apex mucronulate. |
Flowers | anthers 0.6–1.4 mm; styles 1.2–1.5 mm; stigmas 1–1.5(–3) mm. |
anthers 0.7–1 mm; styles 0.4–0.6 mm; stigmas 1–2 mm. |
Achenes | dark reddish brown to black, stipitate, obovoid, faces concave, flat or subtly convex, (1.4–)1.8–2 × 0.9–1 mm, base cuneate, stipe (sometimes absent) spongy, 0.1–0.2 × 0.2–0.4 mm, apex truncate, apiculate, surfaces coarsely papillose. |
dark brown, ± stipitate, ellipsoid, 1.5–2 × 0.7–1 mm, apex obtuse, apiculate surfaces glabrous or puncticulate. |
2n | = 166. |
|
Cyperus elegans |
Cyperus grayi |
|
Phenology | Fruiting summer. | Fruiting summer. |
Habitat | Ditches, damp pastures, pond shores, riverbanks | Coastal dunes, well-drained woods, railroad yards |
Elevation | 0–500 m (0–1600 ft) | 0–200 m (0–700 ft) |
Distribution |
FL; LA; NM; TX; Mexico; Central America; South America
|
CT; DE; GA; MA; MD; NC; NH; NJ; NY; PA; RI; SC; VA |
Source | FNA vol. 23, p. 172. | FNA vol. 23, p. 179. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. trachynotus | C. filiculmis var. grayi, C. filiculmis var. oblitus |
Name authority | Linnaeus: Sp. Pl. 1: 45. (1753) | Torrey: Ann. Lyceum Nat. Hist. New York 3: 268. (1836) |
Web links |