Eleocharis melanocarpa


Ann. Lyceum Nat. Hist. New York 3: 311. 1836.

Common names: Black-fruited spike-rush
Treatment appears in FNA Volume 23. Treatment on page 89. Mentioned on page 62, 66, 87.

Culms to 2 times wider than thick, 35–60(–70) cm × 0.5–1.3 mm, hard, usually with to 10 blunt ribs, at 20X often finely ridged and minutely granular. Leaves: distal leaf sheaths brown to reddish. Spikelets 3–12 × 3–4 mm; proximal scale amplexicaulous, 3.5–4 mm, midrib region very broad and fleshy, apex entire; subproximal scale with a flower; floral scales 30–40, 8–10 per mm of rachilla, orange-brown to stramineous, midrib region stramineous, broadly ovate, papery or sometimes membranous, 3–4 × 2 mm, apex entire, rounded. Flowers: perianth bristles present, sometimes rudimentary, brown, length variable, obscurely retrorsely spinulose; anthers brown, 1.7–2.2 mm. Achenes subdeltoid in outline, sometimes broadly obpyriform, equilaterally trigonous, angles prominent, 0.9–1.2 × 0.7–1.1 mm, apex truncate. Tubercles sessile, depressed-pyramidal, often apiculate, as wide as achene, 0.3–0.5 × 0.7–1.1 mm.

Phenology: Fruiting summer.
Habitat: Fresh, oligotrophic, acid, sandy or peaty, often drying shores, ponds, ditches
Elevation: 10–300 m


V23 125-distribution-map.jpg

Ala., Fla., Ga., Ind., Mass., Mich., N.Y., N.C., R.I., S.C., Tex., Va.


Eleocharis melanocarpa is reported from Rhode Island; I have not seen a voucher specimen.

Selected References


Lower Taxa

... more about "Eleocharis melanocarpa"
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
Torrey +
Black-fruited spike-rush +
Ala. +, Fla. +, Ga. +, Ind. +, Mass. +, Mich. +, N.Y. +, N.C. +, R.I. +, S.C. +, Tex. +  and Va. +
10–300 m +
Fresh, oligotrophic, acid, sandy or peaty, often drying shores, ponds, ditches +
Fruiting summer. +
Ann. Lyceum Nat. Hist. New York +
Illustrated +  and Endemic +
Eleocharis +
Eleocharis melanocarpa +
Eleocharis (sect. Eleocharis) ser. Melanocarpae +
species +