Difference between revisions of "Fimbristylis miliacea"

(Linnaeus) Vahl

Enum. Pl. 2: 287. 1805

Synonyms: Fimbristylis littoralis GaudichaudIsolepis miliacea (Linnaeus) J. Presl & C. PreslScirpus bengalensis PersoonTrichelostylis miliacea (Linnaeus) Nees
Basionyms: Scirpus miliaceus Linnaeus
Treatment appears in FNA Volume 23. Treatment on page 131. Mentioned on page 122, 130.
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Latest revision as of 16:13, 12 August 2019

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Plants annual, cespitose, 15–50(–70) cm, glabrous, base soft; rhizomes absent. Leaves distichous, in fans, to ca. 2/3 plant height; sheaths keeled, equitant, margins entire; ligule absent; blades bifacial (flattened in same plane as sheath), narrowly triangularlinear, to 2 mm wide, margins scabrid at least distally. Inflorescences: anthela compound, usually diffuse, branched, broadening upward, often as broad as long; scapes slender, angularly ribbed and/or somewhat compressed distally, 1–1.5 mm wide or thick; involucral bracts exceeded by anthela. Spikelets dark red-brown, broadly ovoid to near round, 2–4 min; fertile scales broadly ovate to orbiculate, 1 mm, glabrous, apex broadly rounded, midrib not excurrent. Flowers: stamens 1–2; styles 3-fid, slender, base dilated, apex pubescent. Achenes pale brown, tumid, obovoid, 1 mm, apiculate, reticulate, with pits narrowly rectangular in 4–6 vertical rows per side, the longitudinal ribs most prominent and mostly warty. 2n = 10.

Phenology: Fruiting summer–fall, all year southward.
Habitat: Moist to wet sands and alluvia of open river and stream bottoms, low fields, drawdowns, shores, flatwoods, savanna, seeps, and open disturbed waste places
Elevation: 0–200 m

Distribution

V23 204-distribution-map.jpg

Ala., Ark., Fla., Ga., Ky., La., Miss., Mo., N.C., S.C., Tenn., Tex., Mexico, Central America, South America, Asia, Africa, Indian Ocean Islands, Pacific Ocean Islands, Australia.

Discussion

Fimbristylis miliacea is another widespread annual weed whose origin is probably in the Asian rice belt. Two Linnaean types bear the epithet “miliacea.” A good argument exists that Vahl, first to adopt the plant as a Fimbristylis, took the round-spikeleted element as F. miliacea; the other, ovoid, acute-spikeleted element thus became F. quinquangularis (Vahl) Kunth.

Because Gaudichaud’s epithet “littoralis” was not applied to the complex until 1826, it is invalidated in any case.

References

None.

Lower Taxa

No lower taxa listed.