Cyperus thyrsiflorus

Junghuhn

Linnaea 6: 24. 1831.

Illustrated
Synonyms: Cyperus anceps Liebmann Cyperus dissitiflorus Nees ex Torrey Cyperus pallens (Liebmann) Standley & Steyermark Cyperus regiomontanus var. pallens (Liebmann) Kükenthal Cyperus tribrachiatus (Liebmann) Kükenthal Mariscus dissitiflorus (Torrey) C. B. Clarke Mariscus pallens Liebmann Mariscus tribrachiatus Liebmann
Treatment appears in FNA Volume 23. Treatment on page 185. Mentioned on page 148, 149, 183, 186.

Herbs, perennial, rhizomatous. Culms trigonous, (15–) 20–40(–65) cm × 0.5–1 mm, glabrous. Leaves V-shaped, (10–)20–40 cm × 0.8–2.8(–3) mm, glabrous. Inflorescences: spike 1, densely oblong-cylindric, (15–)25–35(–40) × 12–18(–22) mm, (spikelets loosely spaced, 7–9 per 5 mm of rachis); rays (5–)6–8(–11), 0.5–4(–7.5) cm; bracts (4–)5–7(–8), ascending at 30º, (4–)10–30(–35) cm × (1–)2–4(–7) mm; rachilla deciduous, wings persistent, 0.4–0.5 mm wide. Spikelets (20–)40–80(–100), linear, ± cylindric, scarcely compressed, (4.5–)6–9(–11) × (0.5–) 0.6–0.7(–1) mm; floral scales persistent, (1–)2–3(–4), appressed, medially green, laterally light brown to tawny or bronze, medially (1–)3-ribbed, laterally 3-ribbed, oblong, (2.6–)2.8–3.2(–3.4) × (1–)1.2(–1.4) mm, apex acute, mucronulate, mucro to 0.1(–0.2) mm. Flowers: anthers 0.6–0.8 mm; styles (0.4–)0.6–1(–1.2) mm; stigmas persistent on achenes, prominently exserted from floral scales, (1.5–)2–3(–4) mm. Achenes brown to reddish brown, stipitate, narrowly oblong, 1.8–2.1 × (0.4–)0.5(–0.7) mm, stipe 0.1–0.2 × 0.1–0.2 mm, apex apiculate, acute, surfaces puncticulate.


Phenology: Fruiting summer.
Habitat: Dry, open woods
Elevation: 0–200 m

Distribution

V23 317-distribution-map.jpg

Ala., Fla., Ga., La., Tex., Mexico, West Indies, South America.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus thyrsiflorus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Junghuhn +
Ala. +, Fla. +, Ga. +, La. +, Tex. +, Mexico +, West Indies +  and South America. +
0–200 m +
Dry, open woods +
Fruiting summer. +
Illustrated +
Cyperus anceps +, Cyperus dissitiflorus +, Cyperus pallens +, Cyperus regiomontanus var. pallens +, Cyperus tribrachiatus +, Mariscus dissitiflorus +, Mariscus pallens +  and Mariscus tribrachiatus +
Cyperus thyrsiflorus +
Cyperus subg. Cyperus +
species +