Question: Pseudotsuga, found in North America and Eastern Asia which has also been classified as 'Abies' and 'Tsuga' and Huernia which is found in Eastern and Southern Africa and closely related to 'Stapelia' and 'Hoodia' are both types of what?
Sentence (from "Pseudotsuga"): The number of species has long been debated, but two in western North America and two to four in eastern Asia are commonly acknowledged.
Relevant evidence: Yes