Fimbristylis tomentosa

Vahl

Enum. Pl. 2: 290. 1805.

IntroducedIllustrated
Synonyms: Fimbristylis diphylla var. pluristriata C. B. Clarke Fimbristylis podocarpa Nees
Treatment appears in FNA Volume 23. Treatment on page 124. Mentioned on page 123, 125.

Plants annual, cespitose, to 75 cm; rhizomes absent. Leaves nearly distichous, ascending, 1/2–3/4 length of culms; sheath margins ciliolate, adaxial surface sparsely to copiously hirtellous distally; ligule present, complete; blades narrowly linear, 2–4 (–5) mm wide, flat to shallowly involute, margins ciliate-scabrid, abaxial surface pilose-hirsute. Inflorescences: anthelae compound, ascending-branched, longer than broad; scapes distally oval or flattened, glabrous to pubescent; longest involucral-bract exceeding anthela. Spikelets rusty brown, lanceoloid, 4–6 mm; fertile scales broadly ovate to nearly orbiculate, 2–3 mm, broadly acute, midrib excurrent as mucro or cusp. Flowers: stamens 2; styles 2-fid, flat, fimbriate. Achenes pale to dark-brown with pale umbo, lenticular-obpyriform, 1.7–2 mm, finely pitted, appearing nearly smooth, the pits in at least 20 narrow vertical rows per face. 2n = 10.


Phenology: Fruiting summer–fall.
Habitat: Moist to wet sands, silts or peats of low fields, clearings, waste areas, stream and pond banks, very weedy in ricelands
Elevation: 0–200 m

Distribution

V23 190-distribution-map.jpg

Introduced; Ala., Ark., Fla., Ga., La., Miss., N.C., S.C., Tex., Asia

Discussion

Fimbristylis tomentosa apparently was introduced with early rice culture and is rapidly expanding its range.

Selected References

None.

Lower Taxa

None.
... more about "Fimbristylis tomentosa"
pale +  and dark-brown +
lenticular-obpyriform +
ascending-branched +  and compound +
longer than broad +
Robert Kral +
shortened +
deciduous +
enlarged +
flat +  and shallowly involute +
2mm;4mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
3-5-angled +, compressed +  and terete +
Ala. +, Ark. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Asia +
0–200 m +
hypogynous +  and subtending +
biconvex +  and trigonous +
Moist to wet sands, silts or peats of low fields, clearings, waste areas, stream and pond banks, very weedy in ricelands +
interrupted +  and continuous +
compound +  and simple +
erect +  and spreading +
1/2 length of culms +  and 3/4 length of culms +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer–fall. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
adventitious +
basal +  and proximal +
acute;broadly ovate;nearly orbiculate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
glabrous;pubescent +
flattened +  and oval +
cylindric +
Introduced +  and Illustrated +
single +, 1 +  and 80 +
lanceoloid +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
fimbriate +  and 2-fid +
Fimbristylis diphylla var. pluristriata +  and Fimbristylis podocarpa +
Fimbristylis tomentosa +
Fimbristylis +
species +
not +  and rhizomatous +
plant +  and cespitose +