Cyperus digitatus

Roxburgh

Fl. Ind. 1: 209. 1820.

Illustrated
Treatment appears in FNA Volume 23. Treatment on page 173. Mentioned on page 147, 171, 174.

Herbs, perennial, rhizomatous, coarse. Culms trigonous, 50–150 cm × 2–15 mm, glabrous (rarely sparsely scabridulous on angles proximal to bracts). Leaves inversely W-shaped, 40–100 cm × 5–15 mm. Inflorescences: spikes 1–4, cylindric, (2.5–) 3.5–5 × 1.2–1.5 cm; rays 8–10, (1–) 15–35 cm; 2d order rays 1–3 cm; bracts 8–12, ascending at 45–60°, (5–) 20–80 cm × 3–15 mm; 2d order bracts 3–7 cm × 2–4 mm; rachilla persistent, wings 0.3 mm wide, at achene maturation adaxial edge of wing detaching from rachilla, base remaining firmly attached. Spikelets 35–65, slightly compressed, linear, ± quadrangular, 5–8 × 0.8–1.1 mm; floral scales deciduous, 12–16, appressed, marginally clear, laterally reddish along midrib, medially green, laterally 1–2-ribbed, medially strongly 5-ribbed, ovate, 1.6–1.8 × 1.1–1.3 mm, apex mucronulate. Flowers: anthers 0.4–0.5 mm, connective blunt, at most 0.1 mm; styles 0.8–1 mm; stigmas 0.4 mm. Achenes brown or whitish, sessile, ellipsoid, slightly wider at base, 0.9 × 0.4 mm, surfaces finely puncticulate.


Phenology: Fruiting summer.
Habitat: Wet pastures, stream banks
Elevation: 0–100 m

Distribution

V23 286-distribution-map.jpg

Fla., Tex., Mexico, Central America, South America, Asia, Africa

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus digitatus"
whitish +  and brown +
0.9 cm9 mm <br />0.009 m <br /> (?) +
ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Roxburgh +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
scabridulous +
trigonous +
2mm;15mm +
Fla. +, Tex. +, Mexico +, Central America +, South America +, Asia +  and Africa +
0–100 m +
5-ribbed +  and 1-2-ribbed +
green +, reddish +  and clear +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Wet pastures, stream banks +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
40cm +  and 100cm +
w--shaped +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
continuous +, articulate +, winged +  and wingless +
conspicuous +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
unequal +
8 +  and 10 +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
cylindric +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
35 +  and 65 +
quadrangular;compressed +
0.8mm;1.1mm +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.4 cm4 mm <br />0.004 m <br /> (?) +
2-3-fid +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Undefined subg. Chlorocyperus +, Cyperus subg. Mariscus +  and Undefined subg. Papyrus +
Cyperus digitatus +
Cyperus subg. Cyperus +
species +