Cyperus floribundus

(Kükenthal) J. Rich. Carter & S. D. Jones

Rhodora 99: 330. 1998.

Illustrated
Basionym: Cyperus uniflorus var. floribundus Kükenthal in H. G. A. Engler, Pflanzenr. 20[IV,101]: 521. 1936 Cyperus uniflorus Torrey & Hooker 1836
Treatment appears in FNA Volume 23. Mentioned on page 186, 187.

Herbs, perennial, cespitose, rhizomatous. Culms trigonous, basally tuberous thickened, 15–40 cm × 1–2.5 mm, glabrous. Leaves flat to V-shaped, 10–30 cm × 1–2 mm. Inflorescences: spike 1, densely oblong to ellipsoid, 8–36 × 8–20 mm; rays 4–12, 10–20 cm; bracts 3–6, horizontal to ascending at 30°, V-shaped, 3–15 cm × (3–) 4–5.8 mm; rachilla deciduous, wings 0.5–0.7 mm wide. Spikelets (5–) 20–35 (–60), linear to oblong, quadrangular; 4–12 (–21) × 0.7–1.2 mm, base narrowed to 0.4–1 mm; floral scales persistent, 1–3 (–5), appressed, laterally whitish to reddish-brown, stramineous with reddish spots, medially green, laterally 3–6-ribbed (midrib distinctly scabrid at 30X), narrowly oblong to ovate, 2.6–4.8 × 1.6–2 mm; apex rounded to ± acute, entire, with mucro 0.3–0.5 mm; sterile terminal scale involute, 0.4–0.6 mm wide, uncinate; distal floral scales with cusp 0.6–1.9. Flowers: anthers 0.5–1.3 mm; styles 0.4–0.5 mm; stigmas 0.5–0.9 mm. Achenes light-brown to reddish-brown, sessile to slightly stipitate, narrowly ellipsoid, 1.8–2.4 × 0.6–0.8 mm, apex slightly apiculate, surfaces puncticulate.


Phenology: Fruiting mid summer–early fall (Jul–Sep).
Habitat: Damp, disturbed soils, croplands
Elevation: 0–1000 m

Discussion

Included previously in Cyperus retroflexus (or its synonym C. uniflorus), C. floribundus has a much narrower geographic range (southern Texas and northeastern Mexico) and differs in features of spikelet morphology (J. R. Carter and S. D. Jones 1997).

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Cyperus floribundus"
sessile +  and slightly stipitate +
light-brown +  and reddish-brown +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
ellipsoid +
0.6mm;0.8mm +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
apiculate +  and entire +
rounded;more or less acute +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
(Kükenthal) J. Rich. Carter & S. D. Jones +
persistent +  and deciduous +
narrowed +
Cyperus uniflorus var. floribundus +  and Cyperus uniflorus +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
horizontal +  and ascending +
v--shaped +
0.4 cm4 mm <br />0.004 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
scabridulous +
trigonous +
1mm;2.5mm +
Tex. +  and Mexico +
0–1000 m +
green +, stramineous +, laterally whitish +  and reddish-brown +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
narrowly oblong +  and ovate +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Damp, disturbed soils, croplands +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
10 cm100 mm <br />0.1 m <br /> (?) +  and 30 cm300 mm <br />0.3 m <br /> (?) +
flat +  and v-shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting mid summer–early fall (Jul–Sep). +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
continuous +, articulate +, winged +  and wingless +
conspicuous +
unequal +
4 +  and 12 +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
0.8 cm8 mm <br />0.008 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
densely oblong;ellipsoid +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
20 +  and 35 +
quadrangular;linear;oblong +
0.7mm;1.2mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
2-3-fid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Undefined subg. Chlorocyperus +, Cyperus subg. Mariscus +  and Undefined subg. Papyrus +
Cyperus floribundus +
Cyperus subg. Cyperus +
species +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
herb +  and cespitose +
0.5mm +  and 0.7mm +