an Entity references as follows:
Helianthus nuttallii subsp. nuttallii, also known by the common name Nuttall's sunflower is a subspecies of Helianthus nuttallii in the genus Helianthus in the family Asteraceae. It is considered by The Plant List to be a synonym for H. nuttallii. However, The Jepson Manual argues that it is distinct from the species.