Cyperus croceus |
Cyperus serotinus |
|
---|---|---|
Baldwin's flatsedge |
tidalmarsh flatsedge |
|
Habit | Herbs perennial, cespitose. | Herbs, perennial, stoloniferous; stolons terminated by tubers. |
Culms | trigonous, (4–)14–45 cm × 1–2 mm, glabrous. |
trigonous, 50–100 cm × 5–8 mm, glabrous. |
Leaves | yellow-green, flat, 18–44 cm × 3–4.5 mm. |
3–6, V-shaped, 20–50 cm × 5–8(–10) mm. |
Inflorescences | spikes densely to loosely globose to ovoid, 10–20 mm wide; rays (3–)5–9(–14), 1–15(–26) cm; rachis 3–6(–9) mm; bracts (4–)6–9(–11), horizontal to ascending at 45°, flat, 1–30 cm × 0.5–4 mm; rachilla deciduous, wings persistent, 0.3–0.5(–0.8) mm wide. |
spikes not appearing lateral, rays 5–8, 2–7(–12) cm; bracts 3–4, ± horizontal to ascending at 45°, V-shaped, 5–25 cm × 1.5–8 mm; spikes 1–4, ovoid, 2–4 × 2–3 cm; rachis 1–2.7 cm, smooth or hispidulous; rachilla persistent, wingless or with hyaline wings scarcely 0.1 mm wide. |
Spikelets | (10–)30–50, oblong to lanceoloid, quadrangular to subterete, compressed, 4–8 × 1–1.3 mm; distal spikelet spreading or ascending; floral scales persistent, (1–)2–4(–6), appressed, whitish with red speckles, laterally 2–4-ribbed, ovate, 2.3–3.6 × 1.8–2.2 mm. |
7–14, flattened, lanceoloid, 10–20 × 2–2.5 mm; floral scales 10–30, laterally dark brown to reddish brown, medially greenish, laterally 5–9-ribbed, ovate-deltate; anthers 3, 0.5 mm; styles 0.5 mm; stigmas 1.2–1.6 mm. |
Flowers | anthers 0.5 mm; styles 0.6–1.3 mm; stigmas 1.2–2.6 mm. |
|
Achenes | reddish brown to nearly black, sessile, oblong, ellipsoid, 2–2.4 × 0.4–0.5(–0.7) mm, apex ± truncate-emarginate, apiculate, surfaces puncticulate. |
brown, sessile, ellipsoid, 1.4–1.6 × 1.4–1.5 mm, apex obtuse, apiculate. |
Cyperus croceus |
Cyperus serotinus |
|
Phenology | Fruiting summer–early fall. | Fruiting summer. |
Habitat | Disturbed, sunny areas, coastal rocks, moist thickets | Tidal marshes |
Elevation | 0–200 m (0–700 ft) | 0 m (0 ft) |
Distribution |
AL; AR; DE; FL; GA; LA; MD; MO; MS; NC; NJ; OK; PA; SC; TN; TX; VA; WV; Mexico; Central America; West Indies; South America (Venezuela)
|
DE; NJ; PA; Eurasia [Introduced in North America] |
Discussion | Cyperus globulosus Aublet is a synonym of C. luzulae (Linnaeus) Rottbøll ex Retzius, which is a widespread neotropical species, and it has long been misapplied to Cyperus croceus (G. C. Tucker 1987). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 183. | FNA vol. 23, p. 164. |
Parent taxa | Cyperaceae > Cyperus > subg. Cyperus | Cyperaceae > Cyperus > subg. Juncellus |
Sibling taxa | ||
Synonyms | C. baldwinii, C. cyclostachyus, C. echinatus var. multiflora, C. globulosus var. pseudofiliculmis, C. globulosus var. robustus, C. plankii, C. retrorsus var. robustus, Mariscus bracheilema, Mariscus brittonii | Chlorocyperus serotinus, Juncellus serotinus |
Name authority | Vahl: Enum. Pl. 2: 357. (1805) | Rottbøll: Descr. Pl. Rar., 18. (1772) |
Web links |