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FNA | Family List | FNA Vol. 23 | Cyperaceae | Rhynchospora

68. Rhynchospora fascicularis (Michaux) Vahl, Enum. Pl. 2: 234. 1805 (as Rynchospora).

Schoenus fascicularis Michaux, Fl. Bor.-Amer. 1: 37. 1803; Dichromena distans (Michaux) J. F. Macbride; Phaeocephalum fasciculare (Michaux) House; P. distans (Michaux) House; Rhynchospora distans (Michaux) Vahl; R. distans var. fascicularis (Michaux) Kükenthal; R. dommucensis A. H. Moore; R. fascicularis var. distans (Michaux) Chapman; Schoenus distans Michaux

Plants perennial, cespitose, 100–150 cm; rhizomes absent. Culms erect to excurved ascending, narrowly linear to ± filiform, terete to obscurely trigonous, leafy, densely so toward base, stiff to rather lax. Leaves overtopped by culm; blades linear, ascending, proximally flat, 1–4 mm wide, apex trigonous, subulate, tapering gradually. Inflorescences: spikelet clusters 1–3(–4), proximal mostly widely spaced, dense, broadly turbinate to hemispheric, to 2 cm broad; leafy bracts subulate, exceeding proximal spikelets, slightly or not exceeding most distal clusters. Spikelets red brown, narrowly ovoid, (3–)3.5–5 mm, apex acute; fertile scales ovate, 3–3.5(–4) mm, apex acute, mostly with cusp or mucro 0.5–1 mm. Flowers: bristles 5–6, from rudimentary to reaching tubercle tip, or (rarely) beyond, antrorsely barbellate. Fruits 1–3 per spikelet, (1.5–)2–2.2(–2.5) mm; body dark brown with pale center, lenticular, broadly ellipsoid to ± orbicular, (1.3–)1.5–1.7(–1.9) × 1–1.5 mm, margins pale, narrow or narrowly rounded, flowing to tubercle; surfaces dull, minutely longitudinally striate; tubercle compressed, triangular to triangular subulate, 0.5–0.7(–0.9) mm.

Fruiting late spring–fall or all year (south). Sands and peats of interdunal swales, depressions in savannas, open flatwoods, and seep-bog edges; 0–100 m; Ala., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.; Bermuda; Central America.

In her revision, S. Gale (1944) treated var. distans as the more slender version of the species, one with a smaller inflorescence, more distinctly margined fruit body, and consistently elongate perianth bristles. All those character states appear to vary independently over the total range of the species.


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