Rhynchospora alba

(Linnaeus) Vahl

Enum. Pl. 2: 236. 1805.

Common names: Rhynchospore blanc
Basionym: Schoenus albus Linnaeus Sp. Pl. 1: 44. 1753
Synonyms: Dichromena alba (Linnaeus) J. F. Macbride Phaeocephalum album (Linnaeus) House Rhynchospora luguillensis Britton Triodon albus (Linnaeus) Farwell
Treatment appears in FNA Volume 23. Treatment on page 214. Mentioned on page 202, 213, 230.
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Plants perennial, densely cespitose, 6–75 cm; rhizomes mostly absent. Culms erect to curved, leafy, obscurely trigonous to nearly terete, few ribbed, slender. Principal leaves mostly overtopped by culm; blades narrowly linear to filiform, proximally flat, 0.5–1.5 mm, apex tapering, trigonous. Inflorescences: clusters 1 or 2–3, then widely spaced, narrowly turbinate to hemispheric, 1.5–2.5 cm wide; subtending leafy bracts often exceeded by distal cluster. Spikelets pale brown to nearly white, ellipsoid, 3.5–5.5 mm, apex acute; fertile scales elliptic, 3–3.5(–4) mm, apex acute or acuminate, midrib excurrent as mucro. Flowers: perianth bristles 10–12, slightly overtopping tubercle, retrorsely barbellate or rarely smooth, base often setose. Fruits 1(–2) per spikelet, (2.3–)2.5–3 mm; body pale brown with paler center, stipitateobovoid, lenticular, 1.5–1.8(–2) × 0.9–1.2 mm; surfaces transversely striate, relatively smooth, rim narrow, flowing to tubercle base; tubercle narrowly triangularsubulate, 0.5–1.2 mm.

Phenology: Fruiting summer–fall.
Habitat: Acid, sphagnous, boggy, open sites, poor fens, often on floating mats or peaty interstices of rocky shores
Elevation: 0–2000 m


V23 368-distribution-map.jpg

Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask., Alaska, Calif., Conn., Del., Fla.(?), Ga., Idaho, Ill., Ind., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis., West Indies (Puerto Rico), South America(?), Eurasia.


The smooth-bristled Rhynchospora alba forma laeviseta Gale mostly occurs with the typical antrorsely barbellate type in Pennsylvania, the Great Lakes, British Columbia, Newfoundland, and Nova Scotia.

Selected References


Lower Taxa

... more about "Rhynchospora alba"
Robert Kral +
(Linnaeus) Vahl +
Schoenus albus +
Rhynchospore blanc +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Alaska +, Calif. +, Conn. +, Del. +, Fla.(?) +, Ga. +, Idaho +, Ill. +, Ind. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, West Indies (Puerto Rico) +, South America(?) +  and Eurasia. +
0–2000 m +
Acid, sphagnous, boggy, open sites, poor fens, often on floating mats or peaty interstices of rocky shores +
Fruiting summer–fall. +
Illustrated +
Dichromena alba +, Phaeocephalum album +, Rhynchospora luguillensis +  and Triodon albus +
Rhynchospora alba +
Rhynchospora +
species +