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

61. Rhynchospora gracilenta A. Gray, Ann. Lyceum Nat. Hist. New York. 3: 216. 1835.

Phaeocephalum gracilentum (A. Gray) House; Rhynchospora drummondiana Boeckeler 1858, not Steudel 1855; R. gracilenta var. diversifolia Fernald; R. trichophylla Fernald

Plants perennial, densely cespitose or solitary, 10–100 cm; rhizomes absent. Culms mostly lax, ascending to leaning excurved, leafy, linear to filiform, terete. Leaves shorter than culm; blades ascending, filiform to narrowly linear, proximally flat, 0.5–1.5(–2.5) mm wide, margins distally strongly involute, apex trigonous, tapering. Inflorescences: spikelet clusters 1–3(–4), proximalmost distant, dense to sparse, narrowly turbinate to hemispheric; peduncles and branches ascending; leafy bracts linear setaceous, mostly overtopping clusters. Spikelets red brown, ovoid to lanceoloid, (3.5–)4–5 mm, apex acute; fertile scales ovate, 3–4.5 mm, apex acute, mucronate to awned cuspidate. Flowers: bristles 6, mostly reaching tip of tubercle or beyond, antrorsely barbellate. Fruits 1–3 per spikelet, (2.5–)3–3.5(–4.1) mm; body dark brown with small pale center, lenticular, broadly ellipsoid to suborbicular, 1.3–2.1 × 1.3–1.5 mm, smooth, margins narrow, flowing into tubercle; tubercle triangular-subulate, compressed, mostly 1.5–2 mm.

Fruiting late spring–fall. Moist to wet sandy peaty substrates in ditches, bogs, seeps, wet savannas, barrens, and flatwoods; 0–400 m; Ala., Ark., Del., Fla., Ga., La., Md., Miss., N.J., N.C., Okla., Pa., S.C., Tenn., Tex., Va.; West Indies (Cuba); Central America.

Through the southern coastal plain are wider leaved examples of Rhynchospora gracilenta that are sparingly cespitose to solitary-stemmed, often with but a single terminal inflorescence with dense clusters of spikelets (var. diversifolia). That would be a tenable designation were it not for the large numbers of populations with intermediate habit.


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