This wild sunflower is an erect perennial growing from a network of tough, woody roots with small rhizomes.

"The fitness effects of transgenic disease resistance in wild sunflowers".

Even more surprising, the genetic maps of these laboratory recreations turned out to be very much like the map of the wild sunflower itself.

Seed size variation and predation of seeds produced by wild and crop-wild sunflowers.

They were situated beside a small patch of wild sunflowers.

This wild sunflower is an erect annual reaching heights over a meter.

In Kansas, wild sunflowers in high summer were as common as crab grass.

He said wild sunflowers were "notorious" for being the most toxic, but all sunflowers give off at least some allelopathic compounds.

Vegetation is typically dominated by annual rye grass, curly dock and wild sunflower.

These were wild sunflowers and much smaller, but they grew everywhere.