Carex siderosticta is a species of sedge native to East Asia. It is the only species of Carex known to produce 'pseudo-lateral' culms, which appear to be lateral, but derive from the apical meristem.
Carex siderosticta, GBIF
Carex siderosticta, Encyclopedia of Life
Data related to Carex siderosticta at Wikispecies
Media related to Carex siderosticta at Wikimedia Commons