A cardinal organ part (PO:0025001) that is an ear-shaped outgrowth of the distal part of a leaf sheath (PO:0020104). [source: GR:Pankaj_Jaiswal, POC:curators]
Comment
May wrap around the stem (PO:0009047) or branch (PO:0025073) to which the vascular leaf (PO:0009025) it is part of is attached. Found in some Poaceae.