Pteronia flexicaulis flowerheads

The flowerheads of Pteronia flexicaulis grow at stem-tips, solitary or in groups of up to three. Their peduncles are very short to nearly absent.

The narrow heads are made up of about 20 yellow disc florets, held compactly together in the slightly bulging or ellipsoid involucre. The florets are double the length of the involucre that comprises a few rows of pointed, green bracts, sticky like the leaves. Flowerhead diameter is about 10 mm. 

Flowering happens late in spring and summer (Vlok and Schutte-Vlok, 2015; Bond and Goldblatt, 1984; JSTOR; iNaturalist).