Juncus ingens

Juncus ingens, common name giant rush, is a dioecious perennial with horizontal or ascending rhizomes. The stems are erect, dull green, (1.5–2–5 m tall and 4–10 mm in diameter, cataphylls are to 40 cm or more long. The inflorescence is large and drooping, with many flowers scattered along fine branchlets. Flowers occur mostly October-January, seeds are shed mostly December-April. Juncus ingens was first described by Norman Wakefield in 1957. It is one of only two known dioecious species of Juncus native to Australia, the other being Juncus psammophilus.

Juncus ingens is native to the floodplains of southeastern Australia, occurring mainly in Victoria, forming dense stands on the margins of seasonal wetlands. Giant rush is rarely grazed by introduced herbivores such as cattle or horses, or by native herbivores such as kangaroos, and is also resistant to fire.