The rounded flowerheads of Lachnaea filamentosa become from 3 cm to 10 cm in diameter.

Some erect styles in the individual flower centres can be discerned in the photo. They end in the tufted white stigma branches looking like erect bunches of threads (penicillate), shorter than the lanky stamens spreading around them. The stigmas may be hard to see in flowers where all parts except the yellow-brown anthers are white (Manning 2007; Leistner, (Ed.), 2000; Bond and Goldblatt, 1984; iNaturalist).