Cyperus microiria

Steudel

Syn. Pl. Glumac. 2: 23. 1855.

IntroducedIllustrated
Synonyms: Cyperus iria var. microiria (Steudel) Franchet & Savatier Cyperus iria var. parviflorus (Nees) Miquel Cyperus iria var. rectangularis Kükenthal
Treatment appears in FNA Volume 23. Treatment on page 166. Mentioned on page 146, 165.

Herbs, annual, cespitose. Culms trigonous, (5–)20–60 cm × (0.2–)0.6–2.4 mm, glabrous. Leaves (1–)3–4, V-shaped, 15–40 cm × 3–6 mm. Inflorescences: spikes 2–5(–8), oblong to ovoid, 2–10 cm × 3–12 mm; rays 4–8, to 11 cm; bracts (4–)5(–7), ascending at 45°, V-shaped, (1.5–)8–30(–50) cm × 1–6 mm; rachilla persistent, wingless (successive floral scales 1.1–1.5 mm apart). Spikelets 10–30, spreading, compressed, linear, 4–20 × 1.5–2.1 mm; floral scales deciduous, (2–)6–26, laterally brown to golden brown, edges clear, medially green, 5-ribbed, outermost ribs more noticeable than others, obovate to nearly orbiculate, 1.3–1.8 × 1.2–1.8 mm, margins emarginate, apex mucronulate, mucro 0.2–0.25 mm. Flowers: stamens 2(–3); anthers (0.2–)0.3–0.4 mm, tips of connectives reddish, less than 0.1 mm; styles less than 0.1 mm; stigmas 0.2–0.4(–0.5) mm. Achenes brown, slightly stipitate, obovoid, 1.2–1.4(–1.5) × 0.5–0.7 mm, apex apiculate, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Disturbed soils
Elevation: 0–100 m

Distribution

V23 268-distribution-map.jpg

Introduced; Conn., Ky., Mass., N.J., N.Y., Ohio, Pa., e Asia.

Discussion

The name Cyperus amuricus Maximowicz has been misapplied to C. microiria by some American authors (e.g., M. V. McGivney 1938).

Selected References

None.

Lower Taxa

None.
... more about "Cyperus microiria"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Steudel +
Conn. +, Ky. +, Mass. +, N.J. +, N.Y. +, Ohio +, Pa. +  and e Asia. +
0–100 m +
Disturbed soils +
Fruiting summer. +
Syn. Pl. Glumac. +
Introduced +  and Illustrated +
Cyperus iria var. microiria +, Cyperus iria var. parviflorus +  and Cyperus iria var. rectangularis +
Cyperus microiria +
Cyperus subg. Cyperus +
species +