Rhynchospora microcarpa

Baldwin ex A. Gray

Ann. Lyceum Nat. Hist. New York 3: 202. 1835.

Illustrated
Synonyms: Phaeocephalum microcarpum (Baldwin ex A. Gray) House Phaeocephalum patulum (A. Gray) House Rhynchospora edisoniana Small Rhynchospora sulcata Gale Rhynchospora torreyana var. microrhyncha Grisebach
Treatment appears in FNA Volume 23. Treatment on page 228. Mentioned on page 205, 229, 230.
Please click on the illustration for a higher resolution version.
Illustrator:

Copyright:

Plants perennial, cespitose, to 100 cm; rhizomes absent. Culms erect to ascending, arching, lax, leafy, slender, trigonous. Leaves exceeded by inflorescence; blades ascending to spreading, linear, proximally flat, 1–2 (–3) mm wide, apex trigonous, subulate, tapering. Inflorescences: spikelet clusters 4–6, mostly dense, widely spaced, narrowly turbinate to ellipsoid; peduncles erect to ascending, branches ascending; leafy bracts exceeding proximal clusters. Spikelets dark-brown, ovoid, 2–3 mm, apex acute; fertile scales broadly ovate to ± orbiculate, cupulate, 1.5–2 mm, apex rounded to acute, midrib included or excurrent as bristle. Flowers: perianth bristles 6, from vestigial to (rarely) reaching tubercle tip, antrorsely barbellate. Fruits 2–3 per spikelet, 1.2–1.5 mm; body brown, obovoid to globose, lenticular, 1–1.2 × 0.8–1 mm, margins narrow, distinct; surfaces sharply transversely wavyrugose, intervals with rows of vertical, broadly rectangular or ± isodiametric alveolae; tubercle lowtriangular or triangular, compressed, 0.2–0.3 mm, base lunate.


Phenology: Fruiting late spring–fall or all year (south).
Habitat: Savanna swales, interdunal marshes, broad marshes, wet glades, bog edges, open swamp forests, pond shores
Elevation: 0–100 m

Distribution

V23 403-distribution-map.jpg

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

Discussion

Through much of the range of Rhynchospora microcarpa, particularly in limesink or claybased pond areas, is a somewhat shorter series of plants with narrow leaves, tumid fruit 0.7–0.9 mm, often with isodiametric alveolae and depressedtriangular tubercles. Described by S. Gale as R. sulcata, the plants grade into the more typical morphology for R. microcarpa. In peninsular Florida, apparent intergradation with R. elliottii produces some individuals with broad leaves and triangularsubulate tubercles on nearly flat fruits.

Selected References

None.

Lower Taxa

None.

"wider" is not a number.

... more about "Rhynchospora microcarpa"
isodiametric +  and rectangular +
Robert Kral +
Baldwin ex A. Gray +
shortened +
scabridulous +  and scabrid +
v--shaped +
1mm;2mm +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
warty +, papillate +, alveolate +  and pitted +
lenticular +, obovoid +  and globose +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
arching +, erect +  and ascending +
trigonous +
slender +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and West Indies +
0–100 m +
distalmost +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
biconvex +  and trigonous +
Savanna swales, interdunal marshes, broad marshes, wet glades, bog edges, open swamp forests, pond shores +
racemose +, corymbose +  and paniculate +
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 late spring–fall or all year (south). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
Ann. Lyceum Nat. Hist. New York +
adventitious +
basal +  and proximal +
cupulate;broadly ovate;more or less orbiculate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
cylindric +
Illustrated +
spaced +  and cluster +
ovoid;narrowly turbinate;ellipsoid +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
2 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
cleft +, 2-fid +  and undivided +
wavyrugose +
Phaeocephalum microcarpum +, Phaeocephalum patulum +, Rhynchospora edisoniana +, Rhynchospora sulcata +  and Rhynchospora torreyana var. microrhyncha +
Rhynchospora microcarpa +
Rhynchospora +
species +
sulcate +  and 2-edged +
compressed +  and triangular +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
plant +  and cespitose +