Are both Promenaea and Machaeranthera from North America?
Machaeranthera Machaeranthera is a genus of North American flowering plants in the daisy family which are known by the common name tansyaster.
Platanthera flava Platanthera flava, the palegreen orchid, is a species of pale-flowered orchid. It is native to eastern North America, from Texas east to Florida, north to Ontario, Quebec and Nova Scotia.