Rhynchospora corniculata

(Lamarck) A. Gray

Ann. Lyceum Nat. Hist. New York 3: 205. 1835.

IllustratedEndemic
Basionym: Schoenus corniculatus Lamarck in J. Lamarck and J. Poiret, Tabl. Encycl. 1: 137. 1791
Synonyms: Ceratoschoenus corniculatus (Lamarck) Nees Ceratoschoenus longirostris (Michaux) A. Gray Rhynchospora corniculata var. interior Fernald Schoenus longirostris
Treatment appears in FNA Volume 23. Treatment on page 209. Mentioned on page 200, 210.
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Plants perennial, cespitose, 100–150 (–200) cm, coarse; rhizomes absent. Culms stiffly erect, leafy, triangular, multiribbed; principal leaves overtopped by culm; blades flat, 3–20 mm wide, apex attenuate, trigonous. Inflorescences terminal and axillary, diffuse clusters of corymbs, fascicles turbinate to hemispheric; bracts often overtopping clusters. Spikelets few to several per cluster, brown or reddish-brown, lanceoloid, 10–15 mm, apex narrowly acute; fertile scales broadly lanceolate, (7.5–) 10–13 (–14) mm, apex acute, midrib shortexcurrent or not. Flowers: perianth bristles 5–6, longest reaching to or slightly beyond fruit midbody, antrorsely barbellate. Fruits 1 (–2) per spikelet, 13–20 (–25) mm; body oblongellipsoid, compressed, 4–5 (–6) × 2–3 mm, base narrowed, short, margins thickened, often crimped, surfaces concave, striate, minutely cancellate or pebbled; tubercle subulate, 2-grooved, 10–15 (–20) mm, scabridulous. 2n = 18.


Phenology: Fruiting summer–fall.
Habitat: Swamps, marshes, and shallows, mostly in basic to circumneutral, silty or muddy open sites
Elevation: 0–400 m

Distribution

V23 360-distribution-map.jpg

Ala., Ark., Del., Fla., Ga., Ill., Ind., Ky., La., Md., Miss., Mo., N.C., Okla., S.C., Tenn., Tex., Va.

Discussion

Specimens of Rhyncospora corniculata with base of the tubercle fully as wide as the fruit and with fruit bodies at the lower length range were treated by M. L. Fernald as R. corniculata var. interior Fernald.

The percent of fruit with crimped margins in Rhynchospora corniculata increases westward in the Gulf coastal plain; toward Mexico it is sympatric with R. indianolensis and R. gigantea, which also have crimped fruit.

Selected References

None.

Lower Taxa

None.

"wider" is not a number.

... more about "Rhynchospora corniculata"
reddish-brown +  and brown +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Robert Kral +
(Lamarck) A. Gray +
shortened +
narrowed +
Schoenus corniculatus +
scabridulous +  and scabrid +
v--shaped +
3mm;20mm +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
warty +, papillate +, alveolate +  and pitted +
compressed +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glumaceous +  and foliaceous +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
multiribbed +  and leafy +
triangular +
Ala. +, Ark. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–400 m +
distalmost +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (2 cm20 mm <br />0.02 m <br />) +
biconvex +  and trigonous +
Swamps, marshes, and shallows, mostly in basic to circumneutral, silty or muddy open sites +
turbinate +  and hemispheric +
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 (?) +
Ann. Lyceum Nat. Hist. New York +
adventitious +
1.3 cm13 mm <br />0.013 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
basal +  and proximal +
lanceolate +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
cylindric +
W1 +, Illustrated +  and Endemic +
few +  and several +
2 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
Ceratoschoenus corniculatus +, Ceratoschoenus longirostris +, Rhynchospora corniculata var. interior +  and Schoenus longirostris +
Rhynchospora corniculata +
Rhynchospora +
species +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
scabridulous +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
plant +  and cespitose +