Eragrostis japonica (Thunb.) Trin.
  • Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math.

Cite taxon page as 'WFO (2021): Eragrostis japonica (Thunb.) Trin. Published on the Internet; Accessed on: 21 Oct 2021'

General Information

Annual. Culms erect, or geniculate at base, 30–100 cm tall, 1.5–2.5 mm in diam., 3–4-noded. Leaf sheaths usually loose, longer than internodes, glabrous; ligules scarious, ca. 0.5 mm, fimbriate at apex, pubescent on back; leaf blades flat, 3–25 × 0.3–0.5 cm, smooth and glabrous. Panicle elongated, 6–34 × 1.5–6 cm; branches slender, clustered or verticillate, glabrous in axils. Spikelets usually purplish at maturity, ovate, 1–2 mm, 4–8-flowered; rachilla distarticulating between florets from top downward at maturity. Glumes chartaceous, ovate-lanceolate, subequal, 0.6–0.8 mm, 1-veined, apex obtuse. Lemmas chartaceous, broadly elliptical, distinctly 3-veined, apex obtuse, lower lemma ca. 1 mm. Palea subequal to lemma, along 2 keels ciliolate. Stamens 2; anthers ca. 0.2 mm. Caryopsis red-brown, ovoid, 0.4–0.5 mm. Fl. and fr. Jun–Nov.

  • Provided by: [D].Flora Of CHina @
    • Source: [
    • 3
    • ]. 

    Tufted annual or short-lived perennial; culms 10-150 cm high, erect. Leaf-blades flat, up to 30 cm long and 5 mm wide; ligule membranous, 0.3-0.6 mm long, truncate, fimbriate. Panicle linear, 4-50 cm long; branches ascending close to the main axis or spreading and the panicle lanceolate to narrowly ovate or branches contracted in dense remote pseudo-whorls, typically 3-14 cm long, bare towards the base, the spikelets shortly pedicelled and appressed to the secondary branchlets or longer pedicelled and spreading. Spikelets 4-14-flowered, ovate-oblong, 1.3-3 mm long, breaking up from the apex, the rhachilla fragile; glumes narrowly ovate to broadly oblong-elliptic, subequal, 0.4-0.7 mm long, acute to obtuse; lemmas broadly ovate, 0.7-1 mm long, obtuse; anthers 2, 0.2 mm long. Caryopsis ellipsoid, 0.3-0.5 mm long.

  • Provided by: [C].Flora of Pakistan
    • Source: [
    • 4
    • ]. 


    Caryopsis 0.3–0.5 mm long, obovate.

  • Provided by: [A].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Panicle 9–60 cm long, linear to lanceolate or narrowly ovate, contracted or spreading, the spikelets evenly distributed but often crowded on short pedicels less than 1 mm long, the primary branches not in whorls, terminating in a fertile spikelet, glabrous in the axils, eglandular.

  • Provided by: [A].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Spikelets 1–2.5 × c. 1 mm, ovate-oblong, lightly laterally compressed, 4–8-flowered, the florets disarticulating from the apex downwards, the rhachilla fragile; glumes subequal, 0.4–0.8 mm long, reaching to about the middle of the adjacent lemmas, lightly keeled, narrowly lanceolate to narrowly oblong-elliptic in profile, glabrous, acute or obtuse at the apex; lemmas 0.6–0.9 mm long, lightly keeled, elliptic to ovate in profile, membranous with distinct lateral nerves, ± appressed to the rhachilla, those in opposite rows scarcely imbricate, the rhachilla ± visible between them, greenish or purplish, glabrous, obtuse at the apex; palea glabrous on the flanks, the keels slender, wingless, glabrous or scaberulous; anthers 2, 0.1–0.4 mm long.

  • Provided by: [A].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Robust caespitose annual; culms up to 165 cm tall, erect, often branched below, glabrous at the nodes, eglandular; leaf sheaths eglandular; ligula a short but distinct membrane with fimbriate margin; leaf laminas 3–26 cm × 1–7 mm, linear, flat or with involute margins, glabrous, eglandular.

  • Provided by: [A].Plants Of the World Online Portal - FZ
    • Source: [
    • 2
    • ]. 

    Distribution Map

    • Introduced distribution
    Introduced into
    • Southern America Brazil Amapí
    • Amazonas
    • Parí
    • Rondônia
    • Roraima
    • Bahia
    • Ceará
    • Maranh
    • Paraába
    • Pernambuco
    • Rio Grande do Norte
    • Paraní
    • Rio Grande do Sul
    • Minas Gerais
    • Goiás
    • Mato Grosso
    • Mato Grosso do Sul


     Information From

    Plants Of the World Online Portal - FZ
    • A
    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    Brazil Flora G (2014): Brazilian Flora 2020 project - Projeto Flora do Brasil 2020. v393.147. Instituto de Pesquisas Jardim Botanico do Rio de Janeiro. Dataset/Checklist. doi:10.15468/1mtkaw
    • B Group Brazil Flora, REFLORA Program
    Flora of Pakistan
    Flora of Pakistan. Missouri Botanical Garden. Accessed on Jun. 2020.
    • C Missouri Botanical Garden
    Flora Of CHina @
    'Flora of China @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • D Missouri Botanical Garden
    International Union for Conservation of Nature
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • E All Rights Reserved
    International Union for Conservation of Nature v.3
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • F See IUCN Terms and conditions of use
    • G CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    World Flora Online Data. 2018.
    • H CC0 1.0 Universal (CC0 1.0).