Cyperus mutisii
Galapagos Veg., 53. 1854.
Herbs, perennial, cespitose, rhizomatous. Culms trigonous, (20–) 30–120 cm × 1.4–3.5 mm, glabrous or occasionally with scattered prickles on distal angles. Leaves 2–4 (–6), inversely W-shaped, 10–60 (–70) cm × (2–) 4–13 mm, margins and midribs scabridulous or glabrous. Inflorescences: spikes (1–) 3–6, narrowly cylindric, 1–4 (–6) cm × 5–11 mm; rays 0 or 3–6, 2–23 cm; bracts 5–8, ascending at ± 45°, inversely W-shaped, (4–) 14–40 (–46) cm × 1–12 mm; rachilla deciduous, wings persistent, 0.3–0.5 mm wide. Spikelets 35–100, oblongellipsoid, ± terete, elliptic in cross-section, 3–7 × (0.9–) 1.3–2 mm; distal spikelets spreading or ascending; floral scales persistent, 1–2 (–5), appressed, becoming clear at maturity, laterally brownish to reddish-brown, medially greenish, laterally 3–5-ribbed, medially 3-ribbed, often erose at maturity, ovate to elliptic, 2.2–3.2 × 1.5–2.1 mm, apex obtuse. Flowers: anthers 0.6–0.8 mm; styles 0.4–0.8 mm; stigmas 1.2–2.2 mm. Achenes brown to reddish-brown, sessile, broadly ellipsoid, slightly dorsiventrally flattened, 1.5–1.8 × 0.7–0.9 (–1) mm, apex obtuse, apiculate, surfaces papillose to puncticulate.
Phenology: Fruiting summer–fall (Jun–Nov).
Habitat: Clearings in montane forests, canyons
Elevation: 500–1500 m
Distribution
Ariz., Mexico, Central America, South America
Discussion
Cyperus mutisii is recognized by its cylindric spikes borne digitately at the ends of the rays and its short, plump spikelets. As spikelets mature, the floral scales, having erose margins contrasting with the brownish sides, beome useful distinguishing features.
Selected References
None.
Lower Taxa
"shortened" is not a number.