Of the two flowering plants Eriogonum and Ascocenda, is one natural and the other man-made?
Eriogonum:  The genus is found in North America and is known as wild buckwheat. Ascocenda: × Ascocenda, abbreviated as Ascda in the horticultural trade, is a man-made hybrid orchid genus resulting from a cross between "Ascocentrum" and "Vanda" (Asctm × V).
yes