Cyperus amabilis

Vahl

Enum. Pl. 2: 318. 1805.

Illustrated
Synonyms: Cyperus amabilis var. macrostachyus (Boeckeler) Kükenthal Cyperus aurantiacus Kunth Cyperus aureus Vahl Cyperus aureus var. aurantiacus (Kunth) Boeckeler Cyperus aureus var. macrostachyus Boeckeler Cyperus aureus var. oligostachyus (Kunth) Boeckeler Cyperus microstachyus Cyperus oligostachyus
Treatment appears in FNA Volume 23. Treatment on page 158. Mentioned on page 143, 156.

Herbs, annual, cespitose. Culms 1–10(–25), roundly trigonous, 3–12 cm × 0.3–0.8 mm, glabrous. Leaves 1–3–(4), 1–6 cm × 1(–1.5) mm. Inflorescences: if rays absent heads single, dense, sessile, digitate, 5–20 × 10–30 mm, single heads 10–30(–50) mm; rays usually absent, if present 1–8 cm; 2d order rays infrequently present, 1–2 cm; bracts 3–6, erect to oblique, flat to V-shaped,(0.5–)2–10(–15) cm × 0.5–2 mm. Spikelets 5–10(–20), linear to linear-lanceoloid, (5–)8–12(–35) × 1.6–2.3(–2.5) mm; floral scales (6–)16–30(–76), laterally glossy reddish brown to brown, medially greenish, sometimes also reddish or brownish, laterally ribless, medially strongly 3-ribbed, ovate-lanceolate, 1.9–2(–2.3) mm (including prominent excurved cusp of 0.3–0.5 mm) × 0.8–1.1 mm, apex truncate, emarginate, or cuspidate. Flowers: stamens (1–)2–3; anthers ellipsoid, 0.3 mm, connectives not prolonged; styles 0.3–0.4 mm; stigmas 0.4–0.7 mm. Achenes brown, slightly stipitate, obovoid to oblong, 0.8–0.9 × 0.4–0.5 mm, apex abruptly apiculate, surfaces papillose.


Phenology: Fruiting summer.
Habitat: Seasonally wet, sandy soils
Elevation: 500 m

Distribution

V23 247-distribution-map.jpg

Ariz., Mexico, Central America, South America, Asia, Africa.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus amabilis"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Ariz. +, Mexico +, Central America +, South America +, Asia +  and Africa. +
Seasonally wet, sandy soils +
Fruiting summer. +
Illustrated +
Cyperus amabilis var. macrostachyus +, Cyperus aurantiacus +, Cyperus aureus +, Cyperus aureus var. aurantiacus +, Cyperus aureus var. macrostachyus +, Cyperus aureus var. oligostachyus +, Cyperus microstachyus +  and Cyperus oligostachyus +
Cyperus amabilis +
Cyperus subg. Pycnostachys +
species +