Cyperus flavicomus

Michaux
Fl. Bor.-Amer. 1: 27. 1803.
IntroducedIllustrated
Synonyms: Cyperus albomarginatus (Martius & Schrader ex Nees) Steudel Cyperus albomarginatus var. sabulosus (Martius & Schrader ex Nees) Kükenthal Cyperus sabulosus Martius & Schrader ex Nees Pycreus albomarginatus Martius & Schrader ex Nees Pycreus sabulosus
Treatment appears in FNA Volume 23. Treatment on page 159. Mentioned on page 142, 156.

Herbs, annual, cespitose or single-stemmed. Culms trigonous, easily compressed, 30–75 cm × 1–5 mm, basally soft, glabrous. Leaves 1–3, usually withered at anthesis, V-shaped, 5–35 cm × 2–8 mm. Inflorescences: spikes loosely ovoid, 5–25 × 8–22 mm; rays (3–)5–11, 0.4–20 cm; 2d order rays occasionally present, 5–28 mm; bracts 3–7, horizontal to ascending at 30°, (2–)8–35 cm × (1–)4–10 mm. Spikelets 6–60, linear to lanceoloid, 7–30 × 2–3 mm, margins appearing serrate; floral scales 6–24, loosely overlapping, light brown to reddish brown, with conspicuous clear border, medially greenish, 5–7-ribbed, ovate-obovate, (1.4–)1.7–2.3 × 1.4–2 mm, apex acute to obtuse. Flowers: stamens 2–3; anthers 0.4 mm, connective apex reddish, to 0.1 mm; styles 0.1–0.3 mm; stigmas 0.7–1.5 mm. Achenes jet black to dark reddish brown, sessile, obovoid, broadly rounded, 1.2–1.6 × 0.6–1.1 mm, surfaces minutely punctate.


Phenology: Fruiting summer–early fall.
Habitat: Emergent shorelines, roadsides ditches, marshes
Elevation: 0–200 m

Distribution

V23 250-distribution-map.jpg

Introduced; Ala., Ariz., Fla., Ga., Ky., La., Miss., Mo., N.Mex., N.C., Pa., S.C., Tex., Va., Mexico, Central America, South America, Asia, Africa.

Discussion

Cyperus flavicomus has long been called C. albomarginatus (see G. C. Tucker 1994). The closely related (perhaps not distinct) C. macrostachyos Lamarck, a pantropical subspecies, has been reported from Central America; the relationship of the two species needs further study.

Cyperus flavicomus has been introduced in New York; it has not persisted there (R. S. Mitchell and G. C. Tucker 1997).

Selected References

None.

Lower Taxa

None.

... more about "Cyperus flavicomus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Michaux +
Undefined subg. Pycreus +
Ala. +, Ariz. +, Fla. +, Ga. +, Ky. +, La. +, Miss. +, Mo. +, N.Mex. +, N.C. +, Pa. +, S.C. +, Tex. +, Va. +, Mexico +, Central America +, South America +, Asia +  and Africa. +
0–200 m +
Emergent shorelines, roadsides ditches, marshes +
Fruiting summer–early fall. +
Fl. Bor.-Amer. +
Introduced +  and Illustrated +
Cyperus albomarginatus +, Cyperus albomarginatus var. sabulosus +, Cyperus sabulosus +, Pycreus albomarginatus +  and Pycreus sabulosus +
Cyperus flavicomus +
Cyperus subg. Pycreus +
species +