Helianthus rydbergii Britton
Helianthus rydbergii Britton is a synonym sensu FNA Ed. Comm., 2006c of:
Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long, an accepted subspecies name sensu FNA Ed. Comm., 2006c.
Helianthus rydbergii Britton is a synonym sensu FNA Ed. Comm., 2006c of:
Helianthus nuttallii subsp. rydbergii (Britton) R.W. Long, an accepted subspecies name sensu FNA Ed. Comm., 2006c.