Basic Taxonomy Question

[orchideric]

Oncidia is the plural of Oncidium only if you are speaking or writing in Latin. It would be wrong to use it in a sentence written in English. Oncidiums is appropriate but actually incorrect usage as well (but nobody realy cares). The correct phrases would be "species of Oncidium" or "hybrids of Oncidium". And as an aside, "Oncidium species" is also technically wrong because it implies that the nature of a species in Oncidium is different than the nature of a species in some other genus since Oncidium becomes a modifier of species.

Eric