Obični koštan
Echinochloa crus galli
Koštan (Echinochloa crus-galli (L.) P.Beauv.) je jednogodišnja biljka iz porodice trava (Poaceae). Stabljike su uspravne ili ukošene, vanjske stabljike mogu biti i polegnute uz zemlju. Narastu do 150 cm visine. Korijenje je dobro razvijeno no plitko. Listovi su dugački do 50 cm, široki 1-2 cm, hrapavi, plosnati, imaju izraženu središnju bijelu žilu. Rukavac je gladak. Cvat se sastoji od 5-15 klasova dužine 2-10 cm. Cvjetovi su s dugačkim nitima prašnika.
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