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

19. Rhynchospora floridensis (Britton) H. Pfeiffer, Repert. Spec. Nov. Regni Veg. 49: 82. 1940.

Dichromena floridensis Britton in J. K. Small, Fl. S.E. U.S., 190. 1903

Plants perennial, cespitose, 20–50 cm, wiry; rhizomes absent. Culms erect to spreading, leafy based; scapes nearly filiform, nearly trigonous, few ribbed. Leaves spreading to erect, exceeded by scape; blades filiform to linear, proximally flat or involute, becoming involute, 0.4–2 mm wide, apex tapering, trigonous. Inflorescences terminal, solitary, headlike, dense, white, leafy involucrate, 0.5–1 cm wide; involucral bracts 3–6, spreading to recurved, white based, green tipped, narrowly linear, longest bract elongate subulate, 4–8 cm × 2–5 mm. Spikelets white, ovoid, 4–6 mm; scales several, boat shaped, basal ones with ciliolate keel, fertile ones 3–3.8 mm. Flowers: perianth absent. Fruits 1–1.2 mm; body yellow to black, nearly orbicular, tumidly lenticular, 0.8–1 × 0.6–0.7(–1) mm; surface lattices short linear, vertical in fine undulating rows, with ends raised to rounded, transverse rugulosities; tubercle low triangular, lunate, 0.2–0.3 mm, apex acute, blunt or apiculate.

Fruiting spring–fall, or all year. Moist open areas over reef limestones, rocky pine savanna; 0–50 m; Fla.; Mexico (Chiapas, Yucatán); West Indies (Bahamas); Central America (Belize).

Rhynchospora floridensis is much like R. colorata, with which it is often associated; it can be easily distinguished by its strictly cespitose habit and its ciliolate spikelet scale keels.


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