Cyperus thyrsiflorus
Linnaea 6: 24. 1831.
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
Ala., Fla., Ga., La., Tex., Mexico, West Indies, South America
Discussion
Selected References
None.
Lower Taxa
"shortened" is not a number.