"A spikelet morphology trait (TO:0000657) which is the density of a spikelet (PO:0009051) in the inflorescence (PO:0009049) or on the given inflorescence branch (PO:0009081) order." [Gramene:pankaj_jaiswal, PO:0009049, PO:0009051, PO:0009081, TO:moorel]