Skip to main content
  1. Family: Poaceae Barnhart
    1. Genus: Piresia Swallen
      1. Piresia macrophylla Soderstr.

        This species is accepted, and its native range is French Guiana to Peru.

    [GB]
    Habit
    Perennial; caespitose. Culms 20-50 cm long; wiry. Leaves cauline; 5-8 per branch. Leaf-sheaths pilose (above). Leaf-sheath oral hairs lacking. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole pubescent. Leaf-blades oblong; 9-13 cm long; 15-25 mm wide; mid-green; concolorous. Leaf-blade surface glabrous. Leaf-blade apex acute.
    Inflorescences
    Monoecious; with male and female spikelets in the same inflorescence. Synflorescence on a separate leafless culm. Inflorescence composed of racemes; terminal and axillary. Racemes 1; single; 2-3 cm long; bearing few fertile spikelets; bearing 4-6 fertile spikelets on each. Rhachis pubescent on surface. Sexes mixed. Spikelets in pairs. Fertile spikelets pedicelled; 1 in the cluster. Male spikelets sessile; 1 in a cluster. Pedicels cuneate.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5.5-6 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Glume
    Glumes deciduous; similar; reaching apex of florets; thinner than fertile lemma. Lower glume elliptic; 5.5-6 mm long; 1 length of upper glume; herbaceous; without keels; 5 -veined. Lower glume lateral veins ribbed; with cross-veins. Lower glume apex acute. Upper glume elliptic; 5.5-6 mm long; 1 length of adjacent fertile lemma; herbaceous; without keels; 3 -veined. Upper glume lateral veins ribbed; with cross-veins. Upper glume apex acute.
    Florets
    Fertile florets female. Fertile lemma elliptic; 5.5-6 mm long; indurate; without keel; 5 -veined. Lemma surface pubescent. Lemma margins covering most of palea. Palea indurate; 2 -veined.
    Flowers
    Anthers 3.
    Spikelets
    Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 4 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous. Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 5.5-6 mm long; breaking up at maturity; disarticulating below each fertile floret.
    Male
    Male spikelets distinct from female; 1 flowered; separately deciduous; lanceolate; 4 mm long. Male spikelet glumes absent. Male spikelet lemma 3 -veined; muticous.
    Distribution
    South America: northern South America, western South America, and Brazil.
    Reference
    Olyreae. Soderstrom.
    Diagnostic
    Leaf midvein pubescent above.

    Images

    Distribution

    Native to:

    Brazil North, French Guiana, Peru

    Other Data

    Piresia macrophylla Soderstr. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1988 Nee, M. [34856], Brazil K000997255
    Calderon, C.E. [2789], Brazil K000997253
    Calderon, C.E. [2801], Brazil K000997254

    Bibliography

    First published in Brittonia 34: 203 (1982)

    Accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    Literature

    Kew Backbone Distributions

    • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
    • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.
    • Brako, L. & Zarucchi, J.L. (1993). Catalogue of the Flowering Plants and Gymnosperms of Peru Monographs in Systematic Botany from the Missouri Botanical Garden 45: i-xl, 1-1286.

    Sources

    GrassBase - The Online World Grass Flora
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0