- Flower namelamp rush
- Scientific nameJuncus effusus var. decipens
- Alias藺, イグサ, 藺草, 燈芯草, rush, lamp rush
- Place of originJapan, the Korean Peninsula and China
- Place of floweringWetlands, Rice paddies
- Flowering seasonMay, June, July, August, September
What is lamp rush
Lamp rush (scientific name: Juncus effusus var. decipens) is a perennial wild plant in the family Juncaceae, native to Japan, the Korean Peninsula and China. It is also called "Igusa" (rush). It grows wild in paddy fields and wetlands all over Japan. The grass is 40-100 cm tall and has no leaves and a pith on the stem. The flower stems are green, columnar and reddish brown at the base. In late spring to autumn, it produces six green flowers with six flower crusts extending from the tip of the stem into a clustered inflorescence. The capsule forms a terminal pod after flowering. The stems are used to make tatami mat tables. Representative production areas of tatami are Yatsushiro City (Kumamoto Prefecture) and Okayama Prefecture.
Generic name: Juncus effususus var. decipens, another name: Juncus (rush), lamp rush, Soft rush, rush, Origin: Japan, Korean Peninsula and China, Distribution: Japan, Place of origin: Yatsushiro City (Kumamoto Prefecture) and Okayama Prefecture, Living environment: paddy fields and marshes, grass height: 40-100 cm, no leaves, stem: full pith, stem color: green (reddish brown at the base), stem shape: cylindrical, flower color: green, number of flower segments: 6, Flowering period: May - September, fruit type: capsule, fruit shape: terminal dehiscent.