differentialis showed strongest preference for the common sunflower
, Helianthus annuus L.
Those include the Helianthus nuttallii, a more common sunflower
that grows in higher elevations of the San Bernardino and Rocky Mountain regions, that does not have as much hair on its leaves.
The height of the common sunflower
ranges from three to 12 feet, with some reaching 18 feet.
In the same family with the common sunflower
and Jerusalem artichoke, it has daisy-like, bright yellow flowers on stiff, upright stems.
The field was infected with sunflower rust, the most common sunflower
disease, which damages the leaves and reduces development of the stalk and seed head.
It was never known to be used by any American Indian tribe like the common sunflower
, and it went extinct before anyone had time to study it, he said.
It looks much like the common sunflower
seen along roadsides through the West, but this species is found in only five areas.