inflorescence capitulum inflorescence capitula (exact, plural) calathidium (exact) NYBG:Brandon_Sinn An inflorescence (PO:0009049) with a monopodial growth habit, which at flowering stage (PO:0007616) is composed of a radially-enlarged, determinate, first order inflorescence axis (PO:0025104) with sessile flowers (PO:0009046). hypanthodium (narrow) 2017-04-20T12:53:49Z Many capitulum inflorescences have basal involucral bracts (PO:0009045) and are often discoid or globose in shape. Examples include sunflowers (Helianthus spp.; Asteraceae) and teasels (Dipsacus spp.; Dipsacaceae). capitulum (exact) head (broad) plant_anatomy PO:0030121