Rhynchospora microcephala

(Britton) Britton ex Small

Fl. S.E. U.S., 195. 1903.

Illustrated
Basionym: Rhynchospora axillaris var. microcephala Britton Trans. New York Acad. Sci. 11: 89. 1892 (as Rynchospora)
Synonyms: Rhynchospora cephalantha var. microcephala (Britton) Kükenthal
Treatment appears in FNA Volume 23. Treatment on page 213. Mentioned on page 202, 212.
Please click on the illustration for a higher resolution version.
Illustrator:

Copyright:

Plants perennial, cespitose, 30–90 cm; rhizomes absent. Culms arching or erect, leafy, nearly terete, multiribbed, slender. Principal leaves overtopped by culm; blades linear, proximally flattened, 1–3 mm wide, apex tapering, trigonous. Inflorescences: spikelet clusters 2–6, mostly widely spaced; clusters dense, hemispheric to mostly spheroid, 0.5–1 cm thick. Spikelets dark redbrown to dark-brown, lanceovoid, (2–) 2.5–3.5 (–4) mm, apex acute; fertile scales elliptic, 2–3 mm, apex acute, midrib shortexcurrent or not. Flowers: perianth bristles 6, reaching tubercle tip, retrorsely barbellate. Fruits 1 per spikelet, 2.5–3 mm; body pale-brown with light center, lenticular, obovoid distal to stipe, 1.1–1.5 × 0.9–1.1 mm, margins pale, wirelike, surfaces slick; tubercle triangularsubulate, 0.9–1.2 (–1.5) mm, at least 0.5 mm wide at base.


Phenology: Fruiting summer–fall.
Habitat: Sands and sandy peats of savanna swales, pineland seeps, bogs, ditches, pond shores and banks
Elevation: 0–200 m

Distribution

V23 366-distribution-map.jpg

Ala., Del., D.C., Fla., Ga., La., Md., Miss., N.J., N.C., S.C., Va., West Indies (Cuba)

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Rhynchospora microcephala"
acute;acute;trigonous;tapering +
Robert Kral +
(Britton) Britton ex Small +
2-lobed +  and lunate +
Rhynchospora axillaris var. microcephala +
scabridulous +  and scabrid +
flattened +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
pale-brown +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
warty +, papillate +, alveolate +  and pitted +
obovoid +  and lenticular +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
multiribbed +  and leafy +
erect +  and arching +
slender +
Ala. +, Del. +, D.C. +, Fla. +, Ga. +, La. +, Md. +, Miss. +, N.J. +, N.C. +, S.C. +, Va. +  and West Indies (Cuba) +
0–200 m +
distalmost +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
biconvex +  and trigonous +
Sands and sandy peats of savanna swales, pineland seeps, bogs, ditches, pond shores and banks +
hemispheric +  and mostly spheroid +
erect +, rarely +  and spreading +
3-ranked +  and polystichous +
cauline +  and basal +
wirelike +
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 (?) +
Fl. S.E. U.S., +
adventitious +
basal +  and proximal +
2-keeled +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
cylindric +
Illustrated +
spaced +  and cluster +
dark redbrown +  and dark-brown +
lanceovoid +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
2 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
Rhynchospora cephalantha var. microcephala +
Rhynchospora microcephala +
Rhynchospora +
species +
sulcate +  and 2-edged +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
flattened +, terete +, triangular +  and conic +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
plant +  and cespitose +