Iva xanthiifolia
False Ragweed

Functionally Staminate Floret Dissected


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.