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

51b. Rhynchospora harveyi W. Boott var. culixa (Gale) Kral, Novon. 9: 206. 1999.

Rhynchospora culixa Gale, Rhodora 46: 235, plate 828, figs. 3A, B. 1944; R. grayi Kunth var. culixa (Gale) Kükenthal

Plants perennial, cespitose, to 70–80 cm. Culms mostly excurved, slender. Inflorescences: spikelet clusters mostly loose, branching lax, ascending to arching, ultimate branches with few spikelets; leafy bracts setaceous tipped, these and bractlets exceeding proximal clusters, exceeded by distal. Spikelets prevalently lanceoloid, 3–4 mm, apex acute or acuminate; fertile scales ovate, 2.5–3.5 mm, apex acute, mostly mucronate. Flowers: perianth bristles 6, short, reaching at most to fruit midbody, antrorsely barbellate. Fruits 1(–2) per spikelet, 2–2.2 mm; body brown or red brown, obovoid, lenticular, 1.5–1.6 mm; surfaces with numerous, wavy lines of tiny pitlike, short-rectangular, vertical alveolae, separated by numerous, transverse, undulate, low, broad ridges; tubercle with narrow buttress, low conic, 3–5 mm.

Fruiting spring–summer. Sands and peats of savannas, mostly rises in bogs in pinelands or sandhill bog ecotones; of conservation concern; 0–200 m; Fla., Ga.

Variety culixa is distinguished from var. harveyi by a lower, more slender habit, by sparser inflorescences, the terminal cluster overtopping subtending leafy bract, and by the comparatively flatter fruit. Its fruit body surfaces have broader, low, smooth, and pale transverse ridges.


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