Are Libocedrus and Helianthus both types of plants?
Libocedrus Libocedrus is a genus of five species of coniferous trees in the cypress family Cupressaceae, native to New Zealand and New Caledonia. The genus is closely related to the South American genera "Pilgerodendron" and "Austrocedrus", and the New Guinean genus "Papuacedrus", both of which are included within "Libocedrus" by some botanists. These genera are rather similar to the Northern Hemisphere genera "Calocedrus" and "Thuja": in earlier days, what is now "Calocedrus" was sometimes included in "Libocedrus". They are much less closely related, as recently confirmed (Gadek et al. 2000). The generic name means "teardrop cedar", apparently referring to drops of resin.
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.