Orchidaceae Dahj oncidium was a type of orchid created through genetic engineering in the late-24th century.
Dahj Asha claimed that her father, a xenobotanist, spliced two genuses of orchids and named the resulting offspring after her, which means "yellow and pink." (PIC: "Remembrance")
Given that Dahj's entire personally appeared to be a fiction, the orchid may not be real.