Difference between revisions of "Cyperus polystachyos"
Descr. Pl. Rar., 21. 1772.
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|name=Cyperus brizaeus | |name=Cyperus brizaeus | ||
|authority=J. Presl & C. Presl | |authority=J. Presl & C. Presl | ||
− | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Cyperus polystachyos var. leptostachyus | |name=Cyperus polystachyos var. leptostachyus | ||
|authority=Boeckeler | |authority=Boeckeler | ||
− | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Pycreus polystachyos | |name=Pycreus polystachyos | ||
|authority=unknown | |authority=unknown | ||
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|elevation=0–200 m | |elevation=0–200 m | ||
|distribution=Ala.;Del.;D.C.;Fla.;Ga.;Ky.;La.;Maine;Md.;Mass.;Miss.;N.J.;N.Y.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;W.Va.;Mexico;Central America;South America;Asia;Africa. | |distribution=Ala.;Del.;D.C.;Fla.;Ga.;Ky.;La.;Maine;Md.;Mass.;Miss.;N.J.;N.Y.;N.C.;Okla.;Pa.;S.C.;Tex.;Va.;W.Va.;Mexico;Central America;South America;Asia;Africa. | ||
− | |discussion=<p>Cyperus polystachyos is polymorphic. Adequate understanding of the infraspecific variations of C. polystachyos requires a worldwide examination, which is beyond the scope of this study. The segregates, C. fugax and C. filicinus, are recognized here; they have been usually accepted by recent workers (e.g., M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991).</p> | + | |discussion=<p><i>Cyperus polystachyos</i> is polymorphic. Adequate understanding of the infraspecific variations of <i>C. polystachyos</i> requires a worldwide examination, which is beyond the scope of this study. The segregates, <i>C. fugax</i> and <i>C. filicinus</i>, are recognized here; they have been usually accepted by recent workers (e.g., M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991).</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1772 | |publication year=1772 | ||
|special status= | |special status= | ||
− | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V23/V23_252.xml |
|genus=Cyperus | |genus=Cyperus | ||
|subgenus=Cyperus subg. Pycreus | |subgenus=Cyperus subg. Pycreus |
Revision as of 17:06, 18 September 2019
Herbs, perennial (annual?), cespitose. Culms trigonous or ± terete, (3–)20–45(–70) cm × (0.8–) 1.2–2 mm, glabrous. Leaves (2–) 6–10(–16), flat to V-shaped, (2–) 10–30(–60) cm × 1–4 mm. Inflorescences: spike 1, loosely ovoid to densely turbinate, 12–40 × 10–25 mm; rachis 3–10 mm; rays 1–8(–12), 0.5–3(–6) cm; 2d order rays absent; if rays absent, inflorescence single dense cluster of spikelets, 12–40 mm diam.; bracts (3–)4–6(–7), horizontal to ascending at 45°, flanged V-shaped, (2–)5–15(–23) cm × 1–4 mm. Spikelets (5–)15–30(–40), spreading to appressed-ascending, linear-lanceoloid to linear, compressed, 8–18(–40) × (1–)1.3–1.6(–2) mm; floral scales (8–)12–25(–66), laterally stramineous to light brown, medially green, laterally ribless, medially 3–5-ribbed, oblong, (1.5–)1.8–2.4 × (1–)1.2–1.4 mm, apex acute to ± acute, mucronate. Flowers: stamens 2; anthers (0.4–)0.5–0.8 mm, connective not prolonged; styles 0.6–1(–1.4) mm; stigmas (1–)1.4–2 mm. Achenes light to dark brown, oblong, (0.8–)0.9–1.1(–1.2) × 0.4–0.5(–0.6) mm, base cuneate to ± stipelike, apex truncate, apiculate, surfaces punctate to minutely punctate with raised cells.
Phenology: Fruiting summer–early fall.
Habitat: Shores, ditches, swales between dunes
Elevation: 0–200 m
Distribution
![V23 252-distribution-map.jpg](/w/images/0/08/V23_252-distribution-map.jpg)
Ala., Del., D.C., Fla., Ga., Ky., La., Maine, Md., Mass., Miss., N.J., N.Y., N.C., Okla., Pa., S.C., Tex., Va., W.Va., Mexico, Central America, South America, Asia, Africa.
Discussion
Cyperus polystachyos is polymorphic. Adequate understanding of the infraspecific variations of C. polystachyos requires a worldwide examination, which is beyond the scope of this study. The segregates, C. fugax and C. filicinus, are recognized here; they have been usually accepted by recent workers (e.g., M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991).
Selected References
None.