Iva xanthiifolia
 
False Ragweed

Functionally Staminate Floret Dissected

Regina
20-August-2020

The corolla tube has been peeled back to reveal the united filaments.

The flower head is composed of functionally staminate florets in the centre and a few pistillate florets on the periphery.  The functionally staminate florets contain pollen producing stamens and an unbranched, sterile style.  The pistillate florets posses no stamens, an ovary, and a two-cleft style. Upon maturity the pistillate florets produce the only fruit (achenes) in the head.