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 "Stapeliae"): In size they vary from less than 2.5 cm/1" in length to over 2 m/6" tall.
Relevant evidence: No