Arundo donax L.
Natural range: Old World
Florida status: Introduced. Giant weed
Recognition: Giant ditch-dwelling reed having broad, very strongly auriculate leaves. The basal regions/auricles are white or tan. Auricles reach around the stem. The leaves inserted evenly along the stem like the steps of a ladder. The inflorescence is a large flame-shaped panicle.
Hymenachne is also very large with conspicuous clasping auricles.