Rhynchospora alba

(Linnaeus) Vahl

Enum. Pl. 2: 236. 1805.

Common names: Rhynchospore blanc
Illustrated
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

Distribution

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

Discussion

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

None.

Lower Taxa

None.

"shortened" is not a number."wider" is not a number.

... more about "Rhynchospora alba"
acuminate;acute;acute;trigonous;tapering +
Robert Kral +
(Linnaeus) Vahl +
2-lobed +  and lunate +
Schoenus albus +
scabridulous +  and scabrid +
narrowly linear +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (?) +  and 0.15 cm1.5 mm <br />0.0015 m <br /> (?) +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pale-brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
warty +, papillate +, alveolate +  and pitted +
lenticular +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Rhynchospore blanc +
obscurely trigonous +  and nearly terete +
slender +
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 +
distalmost +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
biconvex +  and trigonous +
Acid, sphagnous, boggy, open sites, poor fens, often on floating mats or peaty interstices of rocky shores +
spaced +  and cluster +
narrowly turbinate +  and hemispheric +
1.5 cm15 mm <br />0.015 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
erect +, rarely +  and spreading +
3-ranked +  and polystichous +
cauline +  and basal +
keeled;terete;keeled;terete +
revolute +  and involute +
decurrent +
plumed +  and barbed +
deciduous +  and persistent +
shorter or longer +
of 2-12(-20) bristles +
Fruiting summer–fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
adventitious +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
basal +  and proximal +
2-keeled +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
cylindric +
Illustrated +
pale-brown +  and nearly white +
1 +, 3 +  and 100 +
ellipsoid +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
2 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
Dichromena alba +, Phaeocephalum album +, Rhynchospora luguillensis +  and Triodon albus +
Rhynchospora alba +
Rhynchospora +
species +
sulcate +  and 2-edged +
flattened +, terete +, triangular +  and conic +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
plant +  and cespitose +