(In Gramineae/Poaceae and Cyperaceae) the 2-keeled hyaline leaflet at the base of, and on the upper/adaxial side of, side branches;
(In palms) the bract at the base of the inflorescence enveloping the inflorescence in bud;
One or two of the first leaves of a lateral branch, different from the other leaves on that branch [old-fashioned and now unusual use]