What's the plural form of common yellow oxalis? Here's the word you're looking for.
Answer
The noun common yellow oxalis can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be common yellow oxalis.
However, in more specific contexts, the plural form can also be common yellow oxalises e.g. in reference to various types of common yellow oxalises
or a collection of common yellow oxalises.