Rhynchospora mixta

Britton in J. K. Small

in J. K. Small, Fl. S.E. U.S., 197, 1328. 1903.

IllustratedEndemic
Synonyms: Phaeocephalum proliferum (Small) House Rhynchospora prolifera Small
Treatment appears in FNA Volume 23. Treatment on page 224. Mentioned on page 201, 204, 223, 227.
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Plants perennial, cespitose, 80–100 cm; rhizomes stoloniferous, often elongate, slender, to 1 dm or more. Leaves exceeded by culm; blades lax, linear, proximally flat, 3–5 mm wide, apex abruptly narrowed, trigonous, subulate. Inflorescences: spikelet clusters 4–6, mostly widely spaced; peduncles erect or ascending, slender; branches capillary, divaricate, or widely spreading, to small clusters of 1–few spikelets; leafy bracts mostly exceeding clusters. Spikelets lanceovoid, 3–4 (–6) mm, apex acute to acuminate; fertile scales elliptic, 2.5 mm, apex acute, midrib forming mucro or awn. Flowers: perianth bristles 6, overtopping tubercle, antrorsely barbellate. Fruits mostly 2–4 (–several) per spikelet, (1.5–) 1.8–2 (–2.1); body greenish or pale-brown, broadly ellipsoid to narrowly obovoid, lenticular, 1.2–1.5 × 1–1.2 mm; surfaces transversely finely wavyrugulose, intervals vertically striatealveolate, or alveolae isodiametric; tubercle flat, triangularsubulate, 0.5–0.6 (–0.8) mm.


Phenology: Fruiting summer–fall.
Habitat: Sandy silts of swamp forests and environs
Elevation: 0–200 m

Distribution

V23 392-distribution-map.jpg

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex.

Discussion

Some extremes of Rhynchospora caduca with more diffuse inflorescences are mistaken for R. mixta, particularly those in which ultimate inflorescence branches lead to solitary spikelets. In those rare instances one should find a somewhat larger spikelet and a broader fruit than is typical for R. mixta.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number."wider" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Rhynchospora mixta"
acute;acute;acuminate +
Robert Kral +
Britton in J. K. Small +
2-lobed +  and lunate +
scabridulous +  and scabrid +
v--shaped +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pale-brown +  and greenish +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
warty +, papillate +, alveolate +  and pitted +
lenticular +, broadly ellipsoid +  and narrowly obovoid +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
ascending +  and appressed +
cluster +  and divaricate +
capillary +
parallel +  and divergent +
terete +, rolled +  and plicate +
trigonous +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +  and Tex. +
0–200 m +
distalmost +
biconvex +  and trigonous +
Sandy silts of swamp forests and environs +
racemose +, corymbose +  and paniculate +
erect +, rarely +  and spreading +
3-ranked +  and polystichous +
cauline +  and basal +
keeled;terete;keeled;terete +
revolute +  and involute +
decurrent +
ascending +  and erect +
plumed +  and barbed +
deciduous +  and persistent +
shorter or longer +
of 2-12(-20) bristles +
Fruiting summer–fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
in J. K. Small, Fl. S.E. U.S., +
stoloniferous +
adventitious +
basal +  and proximal +
2-keeled +
2.5 cm25 mm <br />0.025 m <br /> (?) +
cylindric +
Illustrated +  and Endemic +
spaced +  and cluster +
1.8 +  and 2 +
lanceovoid +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
2 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
wavyrugulose +
Phaeocephalum proliferum +  and Rhynchospora prolifera +
Rhynchospora mixta +
Rhynchospora +
species +
sulcate +  and 2-edged +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
flattened +, terete +, triangular +  and conic +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
plant +  and cespitose +