Eragrostis japonica (Thunb.) Trin.

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Eragrostis japonica

Photo: Bart Wursten

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Synonyms: Diandrochloa diarrhena (Schult.) Henry
Diandrochloa diplachnoides (Steud.) Henry
Diandrochloa japonica (Thunb.) Henry
Diandrochloa namaquensis (Nees ex Schrad.) De Winter
Eragrostis depauperata Andersson
Eragrostis diarrhena (Schult.) Steud.
Eragrostis diplachnoides Steud.
Eragrostis hochstetteri Steud.
Eragrostis interrupta auct. non (R. Br.) P. Beauv.
Eragrostis interrupta var. diplachnoides (Steud.) Stapf ex Hook.f.
Eragrostis interrupta var. koenigii Stapf ex Hook.f.
Eragrostis interrupta var. namaquensis (Nees ex Schrad.) T. Durand & Schinz
Eragrostis interrupta var. tenuissima Stapf ex Hook.f.
Eragrostis interrupta var. diarrhena (Schult.) Stapf ex Hook.f.
Eragrostis leprieurii Steud.
Eragrostis namaquensis Nees ex Schrad.
Eragrostis namaquensis var. diplachnoides (Steud.) Clayton
Eragrostis namaquensis var. robusta Stapf
Eragrostis tenuissima Schrad. ex Nees
Poa diandra Roxb.
Poa diarrhena Schult.
Poa sporoboloides A. Rich.
Poa tenella R. Br.
Poa tenellula Kunth
Roshevitzia diplachnoides (Steud.) Tzvelev
Sporobolus confertiflorus A. Rich.
Vilfa confertiflora (A. Rich.) Steud.
Common names:
Frequency: Frequent
Status: Native
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.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.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.Caryopsis 0.3–0.5 mm long, obovate.
Derivation of specific name: japonica: of Japan
Habitat: In a variety of habitats, usually near water. It may become a weed of cultivation, particularly in fields of rice or cotton.
Altitude range: (metres) Up to 1700 m
Flowering time:
Worldwide distribution: west tropical Africa eastwards through Arabia and India to China and Japan, and southwards to South Africa, Botswana, Malawi, Mozambique, Zambia, Zimbabwe
Zimbabwe distribution: N,W,C,E,S
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Chapano, C. & Mugarisanwa, N.H. (2003). Plants of the Matobo District National Herbarium and Botanic Garden, Zimbabwe Page 13. As Diandrochloa namaquensis

Cope, T.A. (1999). Poaceae Flora Zambesiaca 10(2) Pages 87 - 89.

Jackson, G. & Wiehe, P.O. (1958). An Annotated Check List of Nyasaland Grasses The Government Printer, Zomba, Nyasaland Page 40. As Eragrostis namaquensis and Eragrostis diplachnoides

Mapaura, A. & Timberlake, J. (eds) (2004). A checklist of Zimbabwean vascular plants Southern African Botanical Diversity Network Report No. 33 Sabonet, Pretoria and Harare Page 104.

Poilecot, P. (2007). Eragrostis species of Zimbabwe Éditions Quae,Versailles, France Pages 98 - 99. (Includes a picture).

Setshogo, M.P. (2005). Preliminary checklist of the plants of Botswana. Sabonet Report no. 37. Sabonet, Pretoria and Gaborone Page 137.

Other sources of information about Eragrostis japonica:

Our websites:

Flora of Botswana: Eragrostis japonica
Flora of Caprivi: cultivated Eragrostis japonica
Flora of Malawi: Eragrostis japonica
Flora of Mozambique: Eragrostis japonica
Flora of Zambia: Eragrostis japonica

External websites:

African Plants: A Photo Guide (Senckenberg): Eragrostis japonica
African Plant Database: Eragrostis japonica
BHL (Biodiversity Heritage Library): Eragrostis japonica
EOL (Encyclopedia of Life): Eragrostis japonica
GBIF (Global Biodiversity Information Facility): Eragrostis japonica
Google: Web - Images - Scholar
iNaturalist: Eragrostis japonica
IPNI (International Plant Names Index): Eragrostis japonica
JSTOR Plant Science: Eragrostis japonica
Mansfeld World Database of Agricultural and Horticultural Crops: Eragrostis japonica
Plants of the World Online: Eragrostis japonica
Tropicos: Eragrostis japonica
Wikipedia: Eragrostis japonica

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-24

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2024). Flora of Zimbabwe: Species information: Eragrostis japonica., retrieved 26 May 2024

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