Cyperus plukenetii |
Cyperus grayi |
|
---|---|---|
Plukenet's flatsedge, Plukenet's sedge |
Gray's flatsedge, Gray's sedge |
|
Habit | Herbs, perennial, cespitose. | Herbs, perennial, cespitose, rhizomatous. |
Culms | basally cormlike, obtusely trigonous to subterete, 25–100 cm × 2–4 mm, densely minutely scabridulous. |
basally cormlike, trigonous, 5–40 cm × 0.5–1.3 mm, glabrous. |
Leaves | inversely W-shaped, 20–70 cm × 4–7 mm, adaxial surface densely hirtellous. |
V-shaped, 5–25 cm × 1–3 mm, slightly minutely scabridulous abaxially on margins, midrib. |
Inflorescences | spikes turbinate, 10–12 × 6–9 mm, ± as long as wide; rays 6–12, 1–30 cm (longest bract equaling or shorter than longest ray), harshly scabrid; bracts 3–10, horizontal to ascending at 30°, inversely W-shaped, 6–27 cm × 3–6 mm; rachilla persistent, wings hyaline, 0.5 mm wide, covering 1/2 of mature achene. |
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 | 30–60, proximal spikelets reflexed nearly parallel to ray, distal ones spreading, linear, ± terete, 6–8 × 1–1.4 mm; floral scales persistent, 1(–2), appressed, stramineous, often suffused with reddish purple, laterally 4–6-ribbed, ovate-lanceolate, 4–4.5 × 1.4–1.6 mm, apex straight, excurved mucronate or cuspidate; terminal scale spinose. |
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 0.5–1 mm; styles 1.5–2 mm; stigmas 2 mm. |
anthers 0.7–1 mm; styles 0.4–0.6 mm; stigmas 1–2 mm. |
Achenes | dark brown, narrowly oblong, (2.4–)2.7–2.9(–3.2) × 0.7–0.8 mm, base cuneate, apex obtuse, apiculate, surfaces puncticulate. |
dark brown, ± stipitate, ellipsoid, 1.5–2 × 0.7–1 mm, apex obtuse, apiculate surfaces glabrous or puncticulate. |
2n | = 166. |
|
Cyperus plukenetii |
Cyperus grayi |
|
Phenology | Fruiting summer (Jul–Aug). | Fruiting summer. |
Habitat | Dry sand hills, xeric upland woods | Coastal dunes, well-drained woods, railroad yards |
Elevation | 0–200 m (0–700 ft) | 0–200 m (0–700 ft) |
Distribution |
AL; AR; DE; FL; GA; KY; LA; MD; MO; MS; NC; NJ; OK; SC; TN; TX; VA
|
CT; DE; GA; MA; MD; NC; NH; NJ; NY; PA; RI; SC; VA |
Discussion | Cyperus plukenetii is distinguished by its tight, burlike spikes, few-flowered spikelets, and densely pubescent culms, leaves, and rays. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 180. | FNA vol. 23, p. 179. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Cyperus |
Sibling taxa | ||
Synonyms | C. filiculmis var. grayi, C. filiculmis var. oblitus | |
Name authority | Fernald: Rhodora 47: 110, plate 877. (1945) | Torrey: Ann. Lyceum Nat. Hist. New York 3: 268. (1836) |
Web links |