Fimbristylis decipiens

Kral

Sida 4: 119, fig. 38. 1971.

IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 126. Mentioned on page 123, 125.

Plants annual, cespitose, to 30 cm, base soft, not bulbous; rhizomes absent. Leaves nearly distichous, mostly spreading, to 2/3 length of culms; sheaths ciliate, sheath backs often pilose-hirsute; ligule present, complete; blades narrowly linear, 1.5–2.5 mm wide, flat or shallowly concave, margins scabrid, abaxial surface scattered-pilose, hirsute-ciliate at least proximally. Inflorescences: anthelae simple or compound, open, divaricately branched, mostly as broad as long; scapes slender, 1 mm wide, distally slightly compressed; proximalmost involucral-bract exceeding or shorter than anthela. Spikelets pale-brown or redbrown, ovoid to lanceoloid, 5–6 mm; fertile scales broadly ovate, 1.5–2 mm, acute to obtuse-angled, midrib shortexcurrent as mucro. Flowers: stamens 1–2; styles 2-fid, flat, fimbriate. Achenes whitened-iridescent to brown, lenticular or pyriformobovoid, 1 mm, cancellate, each face with 5–12 vertical rows of transversely oriented rectangular pits, achene margins distally papillose. 2n = 20.


Phenology: Fruiting late summer–fall.
Habitat: Disturbed sites, low pinelands, banks, and fields
Elevation: 0–100 m

Distribution

V23 193-distribution-map.jpg

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

Discussion

In the Atlantic and Gulf Coastal plains, Fimbristylis decipiens often shares habitat with two close, likewise weedy, relatives: F. dichotoma and F. annua. From the former F. decipiens is distinguished by its annual habit, its papillose distal achene edges, and the more spreading anthela branches; from the latter it differs in its usually less papillose achene and its harder, more spreading foliage. No intergrades appear to occur among the three.

Selected References

None.

Lower Taxa

None.
... more about "Fimbristylis decipiens"
whitened-iridescent +  and brown +
reticulate-honeycombed +
pyriformobovoid;lenticular +
branched +, open +, compound +  and simple +
Robert Kral +
shortened +
not bulbous +
deciduous +
enlarged +
concave +  and flat +
1.5mm;2.5mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
3-5-angled +, compressed +  and terete +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +  and Tex. +
0–100 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Disturbed sites, low pinelands, banks, and fields +
interrupted +  and continuous +
compound +  and simple +
erect +  and spreading +
0 length of culms +  and 2/3 length of culms +
with (1-)3-6(-30) bristles and/or scales +
Fruiting late summer–fall. +
2-3(-4)-carpellate +
rectangular +
3 (?) +  and 1 (?) +
adventitious +
basal +  and proximal +
acute;obtuse-angled +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
compressed +
slender +
cylindric +
Illustrated +  and Endemic +
redbrown +  and pale-brown +
single +, 1 +  and 80 +
ovoid;lanceoloid +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
1 (?) +  and 2 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
fimbriate +  and 2-fid +
Fimbristylis decipiens +
Fimbristylis +
species +
not +  and rhizomatous +
plant +  and cespitose +