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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
from FNA
AL; AR; DE; FL; GA; KY; LA; MD; MO; MS; NC; NJ; OK; SC; TN; TX; VA
[WildflowerSearch map]
[BONAP county map]
from FNA
CT; DE; GA; MA; MD; NC; NH; NJ; NY; PA; RI; SC; VA
[BONAP county map]
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
C. acuminatus, C. aggregatus, C. alopecuroides, C. amabilis, C. articulatus, C. bipartitus, C. cephalanthus, C. compressus, C. croceus, C. cuspidatus, C. dentatus, C. dentoniae, C. diandrus, C. difformis, C. digitatus, C. dipsaceus, C. distans, C. distinctus, C. drummondii, C. echinatus, C. elegans, C. entrerianus, C. eragrostis, C. erythrorhizos, C. esculentus, C. fendlerianus, C. filicinus, C. filiculmis, C. filiformis, C. flavescens, C. flavicomus, C. floribundus, C. fugax, C. fuligineus, C. fuscus, C. giganteus, C. gracilis, C. granitophilus, C. grayi, C. grayoides, C. haspan, C. hermaphroditus, C. houghtonii, C. hypopitys, C. hystricinus, C. involucratus, C. iria, C. laevigatus, C. lancastriensis, C. lanceolatus, C. lecontei, C. lentiginosus, C. ligularis, C. lupulinus, C. manimae, C. microiria, C. mutisii, C. niger, C. ochraceus, C. odoratus, C. onerosus, C. ovatus, C. owanii, C. oxylepis, C. pallidicolor, C. papyrus, C. parishii, C. pilosus, C. planifolius, C. polystachyos, C. prolifer, C. prolixus, C. pseudothyrsiflorus, C. pseudovegetus, C. pumilus, C. reflexus, C. refractus, C. retroflexus, C. retrofractus, C. retrorsus, C. rotundus, C. sanguinolentus, C. schweinitzii, C. serotinus, C. seslerioides, C. setigerus, C. spectabilis, C. sphacelatus, C. sphaerolepis, C. squarrosus, C. strigosus, C. surinamensis, C. tetragonus, C. thyrsiflorus, C. virens
C. acuminatus, C. aggregatus, C. alopecuroides, C. amabilis, C. articulatus, C. bipartitus, C. cephalanthus, C. compressus, C. croceus, C. cuspidatus, C. dentatus, C. dentoniae, C. diandrus, C. difformis, C. digitatus, C. dipsaceus, C. distans, C. distinctus, C. drummondii, C. echinatus, C. elegans, C. entrerianus, C. eragrostis, C. erythrorhizos, C. esculentus, C. fendlerianus, C. filicinus, C. filiculmis, C. filiformis, C. flavescens, C. flavicomus, C. floribundus, C. fugax, C. fuligineus, C. fuscus, C. giganteus, C. gracilis, C. granitophilus, C. grayoides, C. haspan, C. hermaphroditus, C. houghtonii, C. hypopitys, C. hystricinus, C. involucratus, C. iria, C. laevigatus, C. lancastriensis, C. lanceolatus, C. lecontei, C. lentiginosus, C. ligularis, C. lupulinus, C. manimae, C. microiria, C. mutisii, C. niger, C. ochraceus, C. odoratus, C. onerosus, C. ovatus, C. owanii, C. oxylepis, C. pallidicolor, C. papyrus, C. parishii, C. pilosus, C. planifolius, C. plukenetii, C. polystachyos, C. prolifer, C. prolixus, C. pseudothyrsiflorus, C. pseudovegetus, C. pumilus, C. reflexus, C. refractus, C. retroflexus, C. retrofractus, C. retrorsus, C. rotundus, C. sanguinolentus, C. schweinitzii, C. serotinus, C. seslerioides, C. setigerus, C. spectabilis, C. sphacelatus, C. sphaerolepis, C. squarrosus, C. strigosus, C. surinamensis, C. tetragonus, C. thyrsiflorus, C. virens
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)
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