Are Libocedrus and Helianthus both types of plants?
Helianthus Helianthus or sunflower (from the Greek: ήλιος , "Hēlios", "sun" and ανθός , "anthos", "flower") L. is a genus of plants comprising about 70 species in the family Asteraceae. The genus is one of many in the Asteraceae that are known as sunflowers. Except for three species in South America, all "Helianthus" species are native to North America. The common name, "sunflower", typically refers to the popular annual species "Helianthus annuus", or the common sunflower, whose round flower heads in combination with the ligules look like the sun. This and other species, notably Jerusalem artichoke ("H. tuberosus"), are cultivated in temperate regions and some tropical regions as food crops for humans, cattle, poultry and ornamental plants. The largest sunflower field is located in Tuscany, Italy.
Helianthus nuttallii subsp. nuttallii H. nuttuallii 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.