Ischaemum L.
  • Sp. Pl. 2: 1049. 1753. (1 May 1753)


Cite taxon page as 'WFO (2020): Ischaemum L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000019218. Accessed on: 25 Sep 2020'

General Information

158. Ischaemum L.

Por R.W. Pohl y G. Davidse.

Anuales o perennes, cespitosas. Tallos sólidos o fistulosos. Vainas carinadas, al menos ligeramente hacia el ápice; lígula una membrana; láminas lineares a linear-lanceoladas, aplanadas. Inflorescencia de 2-numerosos racimos digitados o racemosos; raquis articulado, las espiguillas pareadas, las 2 espiguillas y 1 entrenudo del raquis caedizos como una unidad, o las espiguillas pediceladas desarticulándose separadamente. Espiguillas comprimidas dorsalmente, iguales, desigualmente pediceladas o una sésil, con 2 flósculos. Espiguillas sésiles bisexuales; callo obtuso e insertado en el ápice concavo del entrenudo del raquis; glumas más largas que los flósculos; gluma inferior aplanada, rígida en la parte inferior, herbácea en la parte superior; gluma superior escasamente más larga que la gluma inferior, membranácea, carinada, 5-9-nervia; flósculo inferior estaminado; lema y pálea inferior hialinas, un poco más cortas que la espiguilla; flósculo superior pistilado o bisexual; lema superior hialina, 2-lobada hacia la mitad, aristada entre los lóbulos, la arista geniculada y torcida o no; pálea superior hialina, casi tan larga como la lema superior; lodículas 2; estambres 3; estilos 2; fruto una cariopsis; hilo punteado. Espiguillas pediceladas estaminadas, similares a las espiguillas sésiles, pero frecuentemente un poco más cortas; pedicelos libres; flósculos ambos estaminados. Aprox. 65 spp. Trópicos, la mayoría del Viejo Mundo.

  • Provided by: [B].Flora Mesoamericana
    • Source: [
    • 1
    • 11
    • ]. 

    ISCHAEMUM L.

    Por Richard W. Pohl y Gerrit Davidse

    Anuales o perennes, cespitosas; tallos sólidos o fistulosos; plantas hermafroditas o polígamas. Vainas carinadas, al menos ligeramente hacia el ápice; lígula una membrana; láminas lineares a linear-lanceoladas, aplanadas. Inflorescencia de 2–numerosos racimos digitados o racemosos, raquis articulado, las espiguillas pareadas, las 2 espiguillas y 1 entrenudo del raquis caedizos como una unidad, o las espiguillas pediceladas desarticulándose separadamente; espiguillas comprimidas dorsalmente, iguales, desigualmente pediceladas o una sésil, con 2 flósculos; espiguillas sésiles o subsésiles, bisexuales, callo obtuso e insertado en el ápice cóncavo del entrenudo del raquis, glumas más largas que los flósculos, gluma inferior aplanada, rígida en la parte inferior, herbácea en la parte superior, gluma superior escasamente más larga que la gluma inferior, membranácea, carinada, 5–9-nervia, flósculo inferior estaminado, lema y pálea inferior hialinas, un poco más cortas que la espiguilla, flósculo superior pistilado o bisexual, lema superior hialina, 2-lobada hacia la mitad, aristada entre los lóbulos, la arista geniculada y torcida o no, pálea superior hialina, casi tan larga como la lema superior, lodículas 2, estambres 3, estilos 2; espiguillas pediceladas estaminadas, similares a las espiguillas sésiles, pero frecuentemente un poco más cortas, pedicelos libres, flósculos ambos estaminados. Fruto una cariopsis; hilo punteado.

    Género con 65 especies, distribuido en los trópicos, especialmente del Viejo Mundo; 3 especies en Nicaragua.

  • Provided by: [E].Flora de Nicaragua
    • Source: [
    • 12
    • ]. 

    Spikelets in pairs, all alike, perfect, but the pedicellate spikelet not always fruitful, the rachis and pedicels of the disarticulating racemes thickened; first glume indurate and rounded below, flattened, herbaceous and sometimes winged above, often cross-wrinkled or ridged, the narrow margins sharply inflexed; sterile lemma hyaline, as long as the glumes, enclosing a well-developed palea and stami- nate flower; fertile lemma hyaline, deeply bifid, awned from between the teeth, the awn geniculate, tightly twisted below the bend.

  • Provided by: [F].Flora de Panama
    • Source: [
    • 13
    • ]. 

    Hierbas cespitosas. Hojas con la vaina carinada; lígula una membrana; lámina linear a linear-lanceolada,aplanada. Infls. de 2–numerosos racimos pareados, digitados o racemosos; raquis articulado, las 2 espiguillasy 1 entrenudo del raquis caedizos como una unidad. Espiguillas pareadas, dimorfas, comprimidas dorsalmente;desarticulación por debajo de las glumas. Espiguillas sésiles bisexuales, con un callo obtuso; gluma inferioraplanada, la superior ligeramente más larga que la inferior, 5–9-nervada; flósculos 2, el inferior estaminado, elsuperior pistilado a bisexual; lema hialina, la lema superior aristada; pálea inferior hialina. Espiguillas pedice-ladas masculinas, más cortas que las sésiles; flósculos 2, ambos estaminados.

  • Provided by: [G].Manual de Plantas de Costa Rica
    • Source: [
    • 14
    • ]. 

    Perennial, or sometimes annual. Culms often decumbent and much branched. Leaf blades linear to lanceolate, narrowed to ligule, sometimes pseudopetiolate; ligule membranous; sheath auricles often present. Inflorescence of paired racemes, or occasionally subdigitate, terminal and axillary, exserted or sometimes supported by a spatheole; racemes 1-sided, when paired often locked back to back and appearing as a single cylindrical raceme, spikelets of a pair similar or not; rachis internodes and pedicels stoutly linear to thickly clavate, U-shaped or triquetrous in cross section. Sessile spikelet dorsally compressed; callus truncate or obtuse, inserted into hollowed internode apex; lower glume papery to leathery, shallowly convex or almost flat, 2-keeled or rounded on flanks, sometimes winged, often rugose; upper glume boat-shaped, awnless or with straight awn from apex; lower floret male, well developed with palea; upper lemma usually deeply 2-lobed, awned from sinus, rarely awnless; awn geniculate, glabrous. Pedicelled spikelet as large as sessile or much smaller, upper lemma sometimes geniculately awned.

  • Provided by: [C].Flora Of CHina @ efloras.org
    • Source: [
    • 15
    • ]. 

    Morphology

    Pedicelled spikelet as large as the sessile spikelet or much smaller, often asymmetrical.

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Caryopsis oblong to lanceolate, dorsally compressed.

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Sessile spikelet dorsally compressed; callus obtuse and inserted in the concave top of the internode; inferior glume chartaceous to coriaceous, convex to concave on the back, laterally 2-keeled, often rugose, sometimes winged; superior glume awned or awnless; inferior floret male, rarely barren, with a palea; superior lemma bifid, passing between the teeth into a glabrous awn (rarely awnless).

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Inflorescence of paired, sometimes solitary or digitate, 1-sided racemes, those of a pair often interlocked back to back and mimicking a solitary raceme, terminal or axillary; rhachis internodes and pedicels stoutly linear to clavate or inflated, often exposed on the back of the raceme as a U- or V-shaped segment, sometimes the pedicels so short that the spikelets of a pair appear to be side by side.

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Leaf sheaths mostly with auricles; ligule membranous; leaf laminas linear, sometimes sagittate or falsely petiolate at the base.

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Perennials, sometimes annuals, often decumbent.

  • Provided by: [D].Plants Of the World Online Portal - FZ
    • Source: [
    • 9
    • ]. 

    Perennials, often decumbent, sometimes annuals

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Leaf-blades linear; ligule membranous

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Pedicelled spikelet as large as the sessile or much smaller, often asymmetrical.

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Sessile spikelet dorsally compressed; callus obtuse and inserted in the concave top of the internode; lower glume chartaceous to coriaceous, convex to concave, laterally 2-keeled, sometimes winged; upper glume awned or not; lower floret ♂ with a palea; upper lemma bifid, passing between the teeth into a glabrous awn (rarely awnless)

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Caryopsis oblong to lanceolate, dorsally compressed

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Inflorescence of paired or digitate racemes, the former often interlocked back to back, terminal or axillary; internodes and pedicels clavate to inflated

  • Provided by: [A].Plants Of the World Online Portal - FTEA
    • Source: [
    • 10
    • ]. 

    Included Species

     Information From

    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • A
    Flora Mesoamericana
    http://www.mobot.org/MOBOT/fm/
    Gerrit Davidse, Mario Sousa Sánchez, A. O. Chater, Universidad Nacional Autónoma de México. Instituto de Biología, Missouri Botanical Garden, Natural History Museum (London, England) UNAM, 1994
    • B Missouri Botanical Garden
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    Plants Of the World Online Portal - FZ
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • D
    Flora de Nicaragua
    http://www.tropicos.org/projectwebportal.aspx?projectid=7&pagename=Home&langid=66
    WD Stevens, CU Ulloa, A Pool and OM Montiel. Missouri Botanical Garden Press, 2001
    • E Missouri Botanical Garden
    Flora de Panama
    http://www.tropicos.org/Project/PAC
    Robert E. Woodson, Jr. and Robert W. Schery Annals of the Missouri Botanical Garden Vol. 67, No. 4 (1980), pp. ii-xxxiii
    • F Missouri Botanical Garden
    Manual de Plantas de Costa Rica
    http://www.tropicos.org/Project/Costa%20Rica
    Hammel, B. E.; Grayum, M. H.; Herrera, C.; Zamora, N. Manual de Plantas de Costa Rica. Missouri Botanical Garden Press, 2003-2014
    • G Missouri Botanical Garden
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • H All Rights Reserved
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • I See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use
    Poaceae
    • J CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • K CC0 1.0 Universal (CC0 1.0).