Jättiruoko (aasianjättiruoko) – Arundo donax

Stems (culms) are very stout, 1–1.5 cm in diam., unbranched or with clusters of slender branches from nodes. Leaf arrangement is alternate and very distinctly two-ranked, in a single plane. Leaf blades are 30-60 × 2-5 cm,margins scabrous, tapering to a slender filiform apex; ligule very short (0.7-1.5mm); undulating auricles partly surround the stem. Inflorescence is a panicle 30–60cm, dense, usually purplish; branches 10–25 cm, ascending.