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

41. Rhynchospora recognita (Gale) Kral, Novon. 9: 205. 1999.

Rhynchospora globularis (Chapman) Small var. recognita Gale, Rhodora 46: 245. 1944; Dichromena cymosa (Elliott) J. F. Macbride; Phaeocephalum cymosum (Elliott) House

Plants perennial, cespitose, 60–100(–120) cm; rhizomes absent. Culms leafiest at base, trigonous, slender, somewhat stiff. Leaves exceeded by culms; basal blades spreading, blunt, distal ascending, linear, proximally flat, 2–5 mm wide, apex trigonous, subulate, tapering. Inflorescences: spikelet clusters 3–5 or more, compact, proximalmost widely spaced, turbinate to hemispheric or lobed; peduncles ascending, branches ascending; leafy bracts setaceous at apex, exceeding compounds, setaceous bracts often exceeding ultimate clusters, imparting bristly aspect. Spikelets red brown, ovoid to lanceoloid, (2.7–)3–4 mm, apex acuminate; fertile scales ovate, 2.5–3 mm, apex acute, short acuminate, or notched, midrib usually excurrent as cusp or awn. Flowers: perianth bristles 6, not reaching further than fruit midbody. Fruits 1–3 per spikelet, (1.8–)2–2.3(–2.5) mm; body brown, tumidly lenticular, obovoid to suborbicular, 1.4–1.6(–1.8) × 1.2–1.5 mm; surfaces transversely sharply rugose, intervals of rows of vertical, variously rectangular alveolae; tubercle somewhat compressed, triangular to short conic, 0.5–0.7 mm, short subulate, basal rim often present.

Fruiting spring–summer(–early fall). Sands, silts, clays, and peats of low meadows, ditches, low clearings, savannas; 0–400 m; Ala., Ark., Calif., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mich., Miss., Mo., N.J., N.C., Okla., Pa., S.C., Tenn., Tex., Va., W.Va.; West Indies; Central America.

Rhynchospora recognita has larger fruit and tubercles than is consistent with the varietal rank it has held under R. globularis. The two are often observed in the same locality, and in such cases, R. recognita is taller, stiffer, broader leaved, with spikelet clusters wider, denser, and bristlier, and with distinct orange tints in comparison with the darker, less dense, narrower, and less bristly spikelet clusters of plants of R. globularis.


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