Cyperus elegans |
Cyperus lecontei |
|
---|---|---|
royal flatsedge, sticky flatsedge |
Le Conte's flatsedge |
|
Habit | Herbs, perennial, cespitose, shortly rhizomatous, coarse, viscous. | Herbs, perennial, cespitose, rhizomatous, with stolons, lacking tubers. |
Culms | round to roundly trigonous, 15–80 cm × 2–4 mm, glabrous. |
trigonous, 10–50 cm × 1–3 mm. |
Leaves | adaxial face concave, becoming trigonous apically, 15–75 cm × 1–4 mm, margins involute. |
flat to V-shaped, 10–40 cm × 2–5 mm. |
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. |
heads digitate, 10–40 mm diam.; rays 5–12, 1–12 cm; 2d order rays 1–3 cm; bracts 3–5, horizontal, flat to V-shaped, 1–15 cm × 1–2 mm. |
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. |
(1–)2–4(–6), oblong to linear, compressed, 5–25 × 2.8–3.6 mm; floral scales 20–60, stramineous or reddish green, laterally weakly 3-ribbed, ovate-elliptic, 2.5–3 × 1–1.8 mm. |
Flowers | anthers 0.6–1.4 mm; styles 1.2–1.5 mm; stigmas 1–1.5(–3) mm. |
stamens 3; anthers 1–1.3 mm; styles 0.6 mm; stigmas 1.5 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. |
reddish brown, sessile, ovoid, 0.7–0.8 × 0.4–0.5 mm, apex obtuse, apiculate or not, surfaces glabrous. |
Cyperus elegans |
Cyperus lecontei |
|
Phenology | Fruiting summer. | Fruiting summer. |
Habitat | Ditches, damp pastures, pond shores, riverbanks | Emergent shorelines |
Elevation | 0–500 m (0–1600 ft) | 0–100(–300) m (0–300(–1000) ft) |
Distribution |
FL; LA; NM; TX; Mexico; Central America; South America
|
AL; FL; LA; MS; NC; SC
|
Source | FNA vol. 23, p. 172. | FNA vol. 23, p. 151. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Pycnostachys |
Sibling taxa | ||
Synonyms | C. trachynotus | C. dentatus var. multiradiatus, C. multiradiatus |
Name authority | Linnaeus: Sp. Pl. 1: 45. (1753) | Torrey ex Steudel: Syn. Pl. Glumac. 2: 21. (1855) |
Web links |