flower senesced flower A flower in which all of the petaloid floral organs have completed floral organ senescence. Petaloid floral organs generally are the petals, sepal, or tepals, but may also be floral bracts or petaloid anthers. For scoring phenology in grasses, petaloid floral organs can include lemma, palea or glume, even though a glume is not strictly a floral organ, because it encloses an inflorescence.