Cyperus diandrus

Torrey

Cat. Pl. New York, 90. 1819.

IllustratedEndemic
Synonyms: Pycreus diander (Torrey) C. B. Clarke
Treatment appears in FNA Volume 23. Treatment on page 161. Mentioned on page 142, 157, 159.

Herbs, annual, cespitose, with fibrous roots. Culms trigonous, 4–25(–35) cm, glabrous. Leaves flat, 5–20 cm × 1.5–3 mm. Inflorescences: heads ± digitate, 12–22 mm diam.; rays 3–6, 1–6 cm; bracts 1–4, ± horizontal, flat, 1.5–15 cm × 1.5–3 mm. Spikelets 6–12, oblong-lanceoloid, compressed, 5–10 × 2.8–3.2 mm; floral scales 8–28, closely imbricate, stramineous to light brown or clear (marginal band bright red, spikelet thus appearing dark margined), laterally ribless, oblong to ovate, 2.5–3 × 1.6–1.9 mm. Flowers: stamens 2(–3); anthers 0.3 mm, connective apex reddish, subulate, 0.1–0.2 mm; styles 0.3–0.5 mm; stigmas 2.2–3.1 mm. Achenes brown, network of ridges forming isodiametric or square cells, sessile or stipitate, obovoid to ovoid, 1–1.2 × 0.5–0.6 mm, stipe, if present, 0.1 mm, apex obtuse, apiculate, surfaces minutely punctate.


Phenology: Fruiting summer.
Habitat: Emergent shorelines, in sandy, peaty, or slightly brackish areas (though seldom where disturbed)
Elevation: 0–600 m

Distribution

V23 256-distribution-map.jpg

N.B., N.S., Ont., Que., Conn., Del., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., Pa., R.I., Vt., Va.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus diandrus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Torrey +
Undefined subg. Pycreus +
N.B. +, N.S. +, Ont. +, Que. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, Pa. +, R.I. +, Vt. +  and Va. +
0–600 m +
Emergent shorelines, in sandy, peaty, or slightly brackish areas (though seldom where disturbed) +
Fruiting summer. +
Cat. Pl. New York, +
Illustrated +  and Endemic +
Pycreus diander +
Cyperus diandrus +
Cyperus subg. Pycreus +
species +