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. Although native to Australia, "Juncus ingens" is considered an invasive species in some areas such as Barmah National Park. The spread of "J. ingens" into areas where it historically did not occur is a result of changes to flooding regimes in the now highly regulated Murray-Darling Basin. Specifically, reduced winter flooding levels and extended flooding into summer months  promotes the spread of "J. ingens". Conversely, increasing winter and spring flood depth and duration, and reduction of unseasonal flooding limits the growth and spread of "J. ingens", allowing recolonisation of displaced species such as Moira grass ("Pseudoraphis spinescens").