Cyperus diandrus (Umbrella Flat Sedge)

Overview

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Interesting Facts

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Common Names

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Common Names in English:

Umbrella Flat Sedge, Umbrella Flatsedge

Description

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Family Cyperaceae

Herbs, annual or perennial , cespitose or not, rhizomatous or not, stoloniferous or not. Roots fibrous , principally adventitious. Stems (culms ) usually trigonous , occasionally terete , rarely compressed , usually solid, rarely hollow or septate . Leaves basal and/or cauline, alternate, usually 3-ranked, rarely 2-ranked or multi-ranked, bases forming cylindric sheaths enclosing stem, margins usually fused; junction of sheaths and blades often with adaxial flaps of tissue or fringes of hair (ligules) ; blades frequently absent from some basal leaves , rarely from cauline leaves, when present divergent or ascending , flat, folded, plicate , rolled, or terete, linear , venation parallel. Primary inflorescences (spikelets ) a shortened axis; glumaceous bracts (scales ) 1-many, spirally arranged , sometimes 2-ranked, usually appressed or ascending; scales usually all fertile , each subtending a single flower, sometimes proximal and/or distal scales empty; lateral spikes often with basal, usually empty, usually 2-keeled scale (prophyll) ; occasionally prophyll subtending and enclosing rachilla, bearing 1 pistillate , sometimes (0-) 3 staminate flowers and empty scales (Carex, Cymophyllus, and Kobresia) . Secondary inflorescences panicles, often modified to corymb, pseudoumbel, cyme (anthela), raceme , spike, or capitulum (head ), rarely single spike, usually subtended by foliaceous or, less frequently, glumaceous bracts; secondary inflorescences sometimes simulating spikelets (Carex, Cymophyllus, and Kobresia) . Flowers hypogynous, bisexual in most genera, unisexual in Scleria, Carex, Cymophyllus, and Kobresia; perianth absent or with (1-) 3-6(-30) bristles and/or scales, usually falling off with fruit; stamens usually (1-) 3, rarely more, usually distinct ; anthers basifixed ; pistils 1, 2-3(-4) -carpellate, fused, locule 1; style undivided or branches 2-3(-4) ; stigma sometimes papillate . Fruits achenes, usually trigonous or biconvex ; pericarps thin (except in Scleria) . Seeds 1; testa thin, free from pericarp; embryo basal; endosperm abundant. x = 5-ca. 100.

Genera ca. 100, species ca. 5000 (27 genera, 843 species in the flora ) : worldwide.

No consensus exists regarding the number of genera and the overall relationships of genera within Cyperaceae. The most recent account of the family (P. Goetghebeur 1998) recognized 104 genera distributed among 4 subfamilies and 14 tribes . That arrangement differs somewhat from that of J. Bruhl (1995) . With one minor exception the arrangement of the family here follows that of Goetghebeur.

The family is characterized by the occurrence of a number of unusual cytological features including: (1) chromosomes with diffuse centromeres , (2) post-reductional meiosis, and (3) pollen grains formed from tetrads in which 3 of the 4 microspores fail to develop. The first two features are found in at least some Juncaceae and are unique to the two families. Juncaceae also have pollen in tetrads, but in that family all four microspores produce pollen grains. Some species in some genera of Cyperaceae (particularly Eleocharis) possess chromosomes with localized centromeres (S. S. Bir et al. 1993) . The wide range of chromosome numbers found in Cyperaceae is largely because of agmatoploidy; polyploidy has been hypothesized for some genera, especially Eleocharis, although polyploidy has not been demonstrated unequivocally.

Because of morphologic similarities in vegetative and inflorescence characters, the family has commonly been associated with Poaceae. Cytological features discussed above clearly indicate that to be a superficial similarity . Data from rbcL studies also support the view that Cyperaceae and Poaceae are not closely related (M. R. Duvall et al. 1993b; G. M. Plunkett et al. 1995) ; they do support the concept of close relationship between Cyperaceae and Juncaceae.

For most families of flowering plants the phenological data given are flowering times. Because most Cyperaceae cannot be reliably identified when in flower, in this volume fruiting time is given for all species by season , sometimes qualified by early, mid, or late, or by months. The fruiting time has been interpreted broadly to include the period when the fruit is more or less fully formed but not yet ripe . The fruiting period provided covers the entire range of the taxon . Quite a difference between fruiting periods in different parts of the range of the species may well occur, especially for widespread species and species with extensive elevation range.

For a recent, comprehensive review of the economic importance of Cyperaceae, see D. A. Simpson and C. A. Inglis (2001) .[1]

Genus Cyperus

Herbs, perennial or less often annual , cespitose or not, rhizomatous , stoloniferous , rarely tuberous . Culms solitary or not, trigonous or round , glabrous or scabridulous with extrorse or antrorse (rarely retrorse ) prickles. Leaves usually basal; ligules absent; blades keeled abaxially, flat, V-, or inversely W-shaped in cross section . Inflorescences terminal , rarely pseudolateral, 1st order subumbellate to capitate, 2d order with spicate or digitately arranged spikelets , rarely a solitary spikelet; spikelets 1-150; 1st order rays unequal (rarely equal) in length , produced singly from the axils of inflorescence bracts ; involucral bracts 1-22, spirally arranged at culm apex, spreading to erect , leaflike. Spikelets: scales to 76, distichous, each subtending flower, cylindric to compressed , borne spicately or digitately at ends of rays (occasionally proliferous) . Flowers bisexual [rarely unisexual ], in axils of distichous floral scales, bases often decurrent onto rachilla as ± hyaline wings ; perianth absent; stamens 1-3; styles linear , 2-3-fid, base deciduous or persistent ; stigmas 2-3. Achenes biconvex , flattened, or trigonous.

Species ca. 600: pantemperate and tropical .[2]

Physical Description

Species Cyperus diandrus

Herbs, annual , cespitose, with fibrous roots . Culms trigonous , 4-25(-35) cm, glabrous . Leaves flat, 5-20 cm × 1.5-3 mm. Inflorescences: heads ± digitate, 12-22 mm diam.; rays 3-6, 1-6 cm; bracts 1-4, ± horizontal, flat, 1.5-15 cm × 1.5-3 mm. Spikelets 6-12, oblong-lanceoloid, compressed , 5-10 × 2.8-3.2 mm; floral scales 8-28, closely imbricate, stramineous to light brown or clear (marginal band bright red, spikelet thus appearing dark margined ), laterally ribless, oblong to ovate , 2.5-3 × 1.6-1.9 mm. Flowers: stamens 2(-3) ; anthers 0.3 mm, connective apex reddish, subulate , 0.1-0.2 mm; styles 0.3-0.5 mm; stigmas 2.2-3.1 mm. Achenes brown, network of ridges forming isodiametric or square cells , sessile or stipitate , obovoid to ovoid , 1-1.2 × 0.5-0.6 mm, stipe, if present, 0.1 mm, apex obtuse , apiculate , surfaces minutely punctate . Fruiting summer. [source]

Habit: Graminoid

Habitat

Emergent shorelines , in sandy, peaty, or slightly brackish areas (though seldom where disturbed ); 0-600 m [3].

Typically found at an altitude of 0 to 995 meters (0 to 3,264 feet).[4]

Biology

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Reproduction

Duration: Annual

Taxonomy

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Domain: Eukaryota () - Whittaker & Margulis,1978 - eukaryotes
- Kingdom: Plantae () - Haeckel, 1866 - Plants
  - Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
    - Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
      - Subphylum: Euphyllophytina ()
        Infraphylum: Radiatopses () - Kenrick & Crane, 1997
        Class: Spermatopsida () - Brongniart, 1843
        Subclass: Commelinidae () - Takhtajan, 1967
        Superorder: Juncanae () - Takhtajan, 1967
        Order: Poales () - Small, 1903
        Family: Cyperaceae () - A.L. de Jussieu, 1789, nom. cons. - Sedge Family
        Subfamily: Cyperoideae ()
        Tribe: Cypereae ()
        Genus: Cyperus () - C. Linnaeus, 1753 - Umbrella-sedge, flatsedge [Greek kupeiros, name for Eurasian Cyperus longus Linnaeus]
        Specific epithet: diandrus - Torrey, Cat. Pl. New York. 90. 1819.
        Botanical name: - Cyperus diandrus Torr. Torrey, Cat. Pl. New York. 90. 1819.

Synonyms

Pycreus diander (Torr.) C. B. Clarke • Pycreus diander (Torrey) C. B. Clarke

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Similar Species

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Members of the genus Cyperus

ZipcodeZoo has pages for 172 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

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Notes

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Contributors

Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.

Data Sources

Accessed through GBIF Data Portal November 19, 2007:

Canadian Museum of Nature, Canadian Museum of Nature Herbarium
USDA PLANTS, USDA PLANTS Database
University of Alabama Biodiversity and Systematics, Herbarium

Identifiers

Biodiversity Heritage Library NamebankID: 2660415
Catalogue of Life Accepted Name Code: ITS-39885
Global Biodiversity Information Facility Taxonkey: 13752794
Globally Unique Identifier: urn:lsid:ipni.org:names:304303-1
Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 39885
Natural Heritage Network Species Identifier: PMCYP060P0
U.S.D.A. Plant Symbol: CYDI3
Zipcode Zoo Species Identifier: 33908

Footnotes

Peter W. Ball, A. A. Reznicek, David F. Murray "Cyperaceae". in Flora of North America Vol. 23 Page 3, 4, 192, 243, 252. Oxford University Press. Online at EFloras.org. [back]
Gordon C. Tucker, Brian G. Marcks & J. Richard Carter "Cyperus". in Flora of North America Vol. 23 Page 7, 141, 154, 162, 163, 164, 168, 170, 184,. Oxford University Press. Online at EFloras.org. [back]
"Cyperus". in Flora of North America Vol. 23 Page 142, 157, 159, 161. Oxford University Press. Online at EFloras.org. [back]
Mean = 247.980 meters (813.583 feet), Standard Deviation = 182.790 based on 259 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]

Cyperus diandrus

Overview

Interesting Facts

Common Names

Description

Family Cyperaceae

Genus Cyperus

Physical Description

Species Cyperus diandrus

Habitat

Biology

Reproduction

Taxonomy

Synonyms

Notes

Similar Species

Members of the genus Cyperus

More Info

Further Reading

Notes

Contributors

Data Sources

Identifiers

Footnotes