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

33. Rhynchospora inexpansa (Michaux) Vahl, Enum. Pl. 2: 232. 1805 (as Rynchospora).

Schoenus inexpansus Michaux, Fl. Bor.-Amer. 1: 35. 1803

Plants perennial, cespitose, 30–120 cm; rhizomes absent. Culms arching, leafy, drooping tipped, ± terete, ribbed, slender. Principal leaves exceeded by culm; blades spreading to ascending, narrowly linear, proximally flat, 2–3.5 mm wide, apex trigonous, tapering. Inflorescences: clusters of spikelets 3–6, progressively wider-spaced proximally, narrow, elongate; leafy bracts slender, mostly exceeding clusters. Spikelets red brown, lanceoloid, 5–7 mm, apex acuminate; fertile scales narrowly ovate, 4–5 mm, apex acuminate, midrib included or short excurrent. Flowers: perianth bristles 6, exceeding tubercle, antrorsely barbellate. Fruits (1–)2–3(–4) per spikelet, 3–3.2 mm; body brown, narrowly oblong-ellipsoid, flattened, 2 × 0.8–1 mm; surface strongly transversely wavy rugose, vertically finely striate between ridges; tubercle compressed, narrowly triangular-subulate, 1 mm.

Fruiting summer–fall. Sands, peats, clays, and silts of moist meadows, shores of ponds, flatwoods, disturbed low areas; 0–300 m; Ala., Ark., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.


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