Rhynchospora wrightiana


Flora 64: 78. 1881.

Basionym: Rhynchospora gracillima C. Wright in F. A. Sauvalle, Fl. Cub., 181. 1871,
Synonyms: Rhynchospora distans var. gracillima Kükenthal Rhynchospora distans var. tenuis Britton
Treatment appears in FNA Volume 23. Treatment on page 236. Mentioned on page 206, 235, 237.
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Plants perennial, cespitose, 10–50 cm; rhizomes absent. Culms slender, ± filiform, leafy, terete to bluntly trigonous. Leaves shorter than culm; blades spreading to ascending, ± filiform, proximally flat, 0.5–1(–1.5) mm, apex tapering, trigonous. Inflorescences: spikelet clusters 1–3, loose to dense, widely spaced to close together, turbinate to hemispheric; leafy bracts setaceous, mostly exceeding spikelet clusters. Spikelets dark redbrown, lanceovoid, 2.5–3.5(–4) mm, apex acute; fertile scales ovate, 2–3.5 mm, apex acute or acuminate, rarely minutely awned. Flowers: bristles 6, of various length, mostly extending from fruit midbody to tubercle base, antrorsely barbellate. Fruits 1–2 per spikelet, (2–)2–2.5 mm; body brown with pale center, lenticular, broadly ellipsoid, 1.5–1.7 × 1.2–1.3 mm, surfaces nearly smooth or very finely cancellate; tubercle flat, triangular with short-oblong, blunttipped nose, or triangularsubulate, 0.5–0.8 mm.

Phenology: Fruiting late spring–fall or all year (south).
Habitat: Sands and peats in flatwoods, pine savannas, pond and stream banks, bogs, and seeps
Elevation: 0–200 m


V23 421-distribution-map.jpg

Ala., Fla., Ga., Miss., N.C., S.C., Va., West Indies, Central America.


The morphologic boundary between Rhynchospora wrightiana and R. fascicularis (particularly morphs of R. fascicularis referred to R. fascicularis var. distans) is difficult, as recent annotations of the material testify. It is best to consider R. wrightiana as a lower, distinctly filiformleaved entity with darker brown, shorter spikelets and shorter fruit. Kükenthal’s concept of R. wrightiana appears to include a considerable amount of R. fascicularis var. distans.

Selected References


Lower Taxa

... more about "Rhynchospora wrightiana"
Robert Kral +
Boeckeler +
Rhynchospora gracillima +
Ala. +, Fla. +, Ga. +, Miss. +, N.C. +, S.C. +, Va. +, West Indies +  and Central America. +
0–200 m +
Sands and peats in flatwoods, pine savannas, pond and stream banks, bogs, and seeps +
Fruiting late spring–fall or all year (south). +
Illustrated +
Rhynchospora distans var. gracillima +  and Rhynchospora distans var. tenuis +
Rhynchospora wrightiana +
Rhynchospora +
species +