Rhynchospora wrightiana |
Rhynchospora harveyi |
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Wright's beaksedge |
Harvey's beaksedge |
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Habit | Plants perennial, cespitose, 10–50 cm; rhizomes absent. | Plants perennial, cespitose, 70–110 cm; rhizomes absent. | ||||
Culms | slender, ± filiform, leafy, terete to bluntly trigonous. |
erect to excurved, leafy, obscurely trigonous, slender. |
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Leaves | shorter than culm; blades spreading to ascending, ± filiform, proximally flat, 0.5–1(–1.5) mm, apex tapering, trigonous. |
spreading to ascending, shorter than culm, crowded toward culm base; blades linear, proximally flat, 1–3 mm wide, gradually involute, apically trigonous, subulate. |
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Inflorescences | spikelet clusters 1–3, loose to dense, widely spaced to close together, turbinate to hemispheric; leafy bracts setaceous, mostly exceeding spikelet clusters. |
spikelet clusters 1–4, dense to open, mostly irregularly turbinate; peduncles ascending, branches spreading to erect, ultimate branches with many spikelets; leafy bracts setaceoustipped, usually exceeding all clusters, or at least all but the distal. |
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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. |
light redbrown or brown, broadly ellipsoid to lanceoloid, 3–4 mm, apex acute to acuminate; fertile scales ovate to obovate or suborbiculate, 2–3.5 mm apex acute to rounded or emarginate, midrib included or exserted as mucro. |
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Flowers | bristles 6, of various length, mostly extending from fruit midbody to tubercle base, antrorsely barbellate. |
perianth bristles mostly 6, rarely reaching fruit midbody, antrorsely barbellate. |
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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. |
mostly 1 per spikelet, 2–2.5 mm, body dark brown, obovoid to subglobose, tumid or lenticular, 1.5–1.7 mm, transversely finely rugose to nearly level, intervals with very small, pitlike alveoli. |
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Rhynchospora wrightiana |
Rhynchospora harveyi |
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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 (0–700 ft) | |||||
Distribution |
AL; FL; GA; MS; NC; SC; VA; Central America; West Indies
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AL; AR; FL; GA; KS; LA; MO; MS; NC; OK; SC; TN; TX; VA; se United States; Midwestern |
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Discussion | 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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 23, p. 236. | FNA vol. 23, p. 231. | ||||
Parent taxa | Cyperaceae > Rhynchospora | Cyperaceae > Rhynchospora | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | R. gracillima, R. distans var. gracillima, R. distans var. tenuis | |||||
Name authority | Boeckeler: Flora 64: 78. (1881) | W. Boott: Bot. Gaz. 9: 85. (1884) | ||||
Web links |