Cyperus amabilis

Vahl

Enum. Pl. 2: 318. 1805.

Illustrated
Synonyms: Cyperus amabilis var. macrostachyus (Boeckeler) Kükenthal Cyperus aurantiacus Kunth Cyperus aureus Vahl Cyperus aureus var. aurantiacus (Kunth) Boeckeler Cyperus aureus var. macrostachyus Boeckeler Cyperus aureus var. oligostachyus (Kunth) Boeckeler Cyperus microstachyus Cyperus oligostachyus
Treatment appears in FNA Volume 23. Treatment on page 158. Mentioned on page 143, 156.

Herbs, annual, cespitose. Culms 1–10 (–25), roundly trigonous, 3–12 cm × 0.3–0.8 mm, glabrous. Leaves 1–3– (4), 1–6 cm × 1 (–1.5) mm. Inflorescences: if rays absent heads single, dense, sessile, digitate, 5–20 × 10–30 mm, single heads 10–30 (–50) mm; rays usually absent, if present 1–8 cm; 2d order rays infrequently present, 1–2 cm; bracts 3–6, erect to oblique, flat to V-shaped, (0.5–) 2–10 (–15) cm × 0.5–2 mm. Spikelets 5–10 (–20), linear to linear-lanceoloid, (5–) 8–12 (–35) × 1.6–2.3 (–2.5) mm; floral scales (6–) 16–30 (–76), laterally glossy reddish-brown to brown, medially greenish, sometimes also reddish or brownish, laterally ribless, medially strongly 3-ribbed, ovatelanceolate, 1.9–2 (–2.3) mm (including prominent excurved cusp of 0.3–0.5 mm) × 0.8–1.1 mm, apex truncate, emarginate, or cuspidate. Flowers: stamens (1–) 2–3; anthers ellipsoid, 0.3 mm, connectives not prolonged; styles 0.3–0.4 mm; stigmas 0.4–0.7 mm. Achenes brown, slightly stipitate, obovoid to oblong, 0.8–0.9 × 0.4–0.5 mm, apex abruptly apiculate, surfaces papillose.


Phenology: Fruiting summer.
Habitat: Seasonally wet, sandy soils
Elevation: 500 m

Distribution

V23 247-distribution-map.jpg

Ariz., Mexico, Central America, South America, Asia, Africa

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Cyperus amabilis"
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
obovoid;oblong +
0.4mm;0.5mm +
ellipsoid +
0.3 cm3 mm <br />0.003 m <br /> (?) +
apiculate +, cuspidate +, emarginate +  and truncate +
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
shortened +
persistent +  and deciduous +
decurrent +
w--shaped +  and keeled +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
10 cm100 mm <br />0.1 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
flat +  and v-shaped +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
parallel +  and divergent +
terete +, rolled +  and plicate +
not prolonged +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
scabridulous +
trigonous +
0.3mm;0.8mm +
Ariz. +, Mexico +, Central America +, South America +, Asia +  and Africa +
0.2 cm2 mm <br />0.002 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
brownish +, reddish +, greenish +, reddish-brown +  and brown +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
ovatelanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
hypogynous +  and subtending +
biconvex +  and trigonous +
Seasonally wet, sandy soils +
digitate +  and sessile +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
subumbellate +  and capitate +
spreading +  and erect +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
1cm +  and 6cm +
1 cm10 mm <br />0.01 m <br /> (?) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting summer. +
2-3(-4)-carpellate +
antrorse +  and extrorse +
3 (?) +  and 1 (?) +
unequal +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
adventitious +
basal +  and proximal +
cylindric;compressed +
cylindric +
Illustrated +
1.2 cm12 mm <br />0.012 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
5 +  and 10 +
linear;linear-lanceoloid +
1.6mm;2.3mm +
2 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
2-3-fid +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
papillose +
Cyperus amabilis var. macrostachyus +, Cyperus aurantiacus +, Cyperus aureus +, Cyperus aureus var. aurantiacus +, Cyperus aureus var. macrostachyus +, Cyperus aureus var. oligostachyus +, Cyperus microstachyus +  and Cyperus oligostachyus +
Cyperus amabilis +
Cyperus subg. Pycnostachys +
species +
tuberous +, stoloniferous +  and rhizomatous +
herb +  and cespitose +