Fimbristylis perpusilla

R. M. Harper ex Small & Britton in J. K. Small

in J. K. Small, Fl. S.E. U.S., 188, 1327. 1903.

Treatment appears in FNA Volume 23. Treatment on page 128. Mentioned on page 122, 127.
Revision as of 21:06, 16 December 2019 by FNA>Volume Importer

Plants annual, delicate, cespitose, slender, 2–15 cm; rhizomes absent. Leaves polystichous, spreading to ascending, mostly excurved, exceeding or exceeded by culms; sheaths entire, backs glabrous; ligule absent; blades setaceous-filiform, to 0.5 mm wide, flat to involute, sparsely scabrid-ciliate. Inflorescences: anthelae mostly simple, open, nearly as broad as long, ascending-branching, umbelliform, of 3–10 cormose spikelets; scapes filiform, 0.5–0.6 mm thick; proximalmost involucral bracts setaceous-bladed, exceeding anthela. Spikelets pale green to light brown, ovoid to globose or short-cylindric, 2–5 mm; fertile scales lance-linear to oblong-linear, 1.5 mm, glabrous, midrib strongly excurrent, erect to excurved cusp. Flowers: stamens 1; styles 2-fid, slender, glabrous. Achenes pale brown with iridescent tints, curved-cylindric, 0.4–0.6 mm, finely reticulate, in 12 vertical rows of narrowly rectangular, horizontal cells. 2n = 10.


Phenology: Fruiting summer–fall.
Habitat: Fluctuating sandy-silty shores of shallow ponds, pine savanna pools, reservoirs, ditches, and canals
Elevation: 0–100(–200) m

Distribution

V23 197-distribution-map.jpg

Del., Ga., Md., N.C., S.C., Tenn., Va.

Discussion

Of conservation concern.

The nearest relative of this ephemeral is Fimbristylis dipsacea, a similarly diminutive Eurasian and South American annual with broader, more spreadingcusped spikelets and oddly compound-papillate fruit.

Selected References

None.

Lower Taxa

None.
... more about "Fimbristylis perpusilla"
Robert Kral +
R. M. Harper ex Small & Britton in J. K. Small +
Del. +, Ga. +, Md. +, N.C. +, S.C. +, Tenn. +  and Va. +
0–100(–200) m +
Fluctuating sandy-silty shores of shallow ponds, pine savanna pools, reservoirs, ditches, and canals +
Fruiting summer–fall. +
in J. K. Small, Fl. S.E. U.S., +
Illustrated +, Endemic +  and Conservation concern +
Fimbristylis perpusilla +
Fimbristylis +
species +