Fimbristylis puberula

(Michaux) Vahl

Enum. Pl. 2: 289. 1805.

IllustratedEndemic
Basionym: Scirpus puberulus Michaux Fl. Bor.-Amer. 1: 31. 1803
Treatment appears in FNA Volume 23. Mentioned on page 129.

Plants perennial, mostly loosely cespitose, to 100 cm, bases swollen; rhizomes short, knotty, or scaly, slender, contorted. Culms sometimes solitary, narrowly linear, distally angular, glabrous. Leaves ascending, from 1/3 as long to equally as long as culms, glabrous to pubescent; sheaths apically ciliate; ligule essentially absent or (in rhizomatous individuals) present, complete or incomplete; blades narrowly linear, 1–2 mm wide, mostly strongly involute, scabridciliate. Inflorescences: anthelae simple or compound, compact or diffuse, mostly broad, ascending-branching; scapes slender, wandlike, 1 mm thick; lower leafy involucral-bracts exceeded by or exceeding panicle. Spikelets variously redbrown, broadly ovoid to lance-cylindric, 5–10 mm; fertile scales broadly ovate, obtuse or obtuse-angled, 2.5–3.5 mm, abaxially glabrous or variously puberulent, midrib excurrent as mucro. Flowers: stamens 3; styles 2-fid, flat, fimbriate. Achenes yellowish to dark-brown, lenticular-obovoid, 1 mm, with 11–20 vertical lines of horizontally rectangular or isodiametric, distinct or indistinct pits. 2n = 20.

Distribution

V23 200-distribution-map.jpg

Ont., Ala., Ariz., Ark., Del., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mich., Miss., Mo., N.C., N.J., N.Mex., N.Y., Nebr., Ohio, Okla., S.C., Tenn., Tex., Utah, Va.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Culm bases swollen, knotty, closely joined forming short thick, knotty rhizomes; leaves and sheaths totally pubescent or glabrous; ligule absent or incomplete; backs of involucral sheaths and fertile scales puberulent at least distally. Fimbristylis puberula var. puberula
1 Culm bases not swollen, producing several slender, scaly, orange rhizomes; leaves and sheaths mostly glabrous; ligule present, mostly complete; involucral sheaths and fertile scales usually smooth. Fimbristylis puberula var. interior
... more about "Fimbristylis puberula"
yellowish +  and dark-brown +
reticulate-honeycombed +
lenticular-obovoid +
ascending-branching +, compound +  and simple +
Robert Kral +
(Michaux) Vahl +
shortened +
deciduous +
swollen +
enlarged +
Scirpus puberulus +
keeled +, terete +, folded +  and flat +
1mm;2mm +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
3-5-angled +, compressed +  and terete +
Ont. +, Ala. +, Ariz. +, Ark. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mich. +, Miss. +, Mo. +, N.C. +, N.J. +, N.Mex. +, N.Y. +, Nebr. +, Ohio +, Okla. +, S.C. +, Tenn. +, Tex. +, Utah +  and Va. +
hypogynous +  and subtending +
biconvex +  and trigonous +
interrupted +  and continuous +
compound +  and simple +
erect +  and spreading +
polystichous +  and distichous +
glabrous;pubescent +
incomplete +  and complete +
with (1-)3-6(-30) bristles and/or scales +
2-3(-4)-carpellate +
distinct +
indistinct +
isodiametric +  and rectangular +
3 (?) +  and 1 (?) +
adventitious +
basal +  and proximal +
puberulent;glabrous +
obtuse-angled;obtuse;ovate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
wand-like +
slender +
1 cm10 mm <br />0.01 m <br /> (?) +
cylindric +
Illustrated +  and Endemic +
single +, 1 +  and 80 +
broadly ovoid;lance-cylindric +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
fimbriate +  and 2-fid +
Fimbristylis puberula +
Fimbristylis +
species +
not +  and rhizomatous +
plant +  and cespitose +