cucumbers, zucchini, jicama allowed on USD?

Not yet begun UltraMetabolism Not yet begun UltraMetabolism

Doing the UltraSimple Diet Doing the UltraSimple Diet

I have searched far and wide to find an answer to my question.  Are cucumbers, zucchini and/or jicama allowed on the USD?  I'm looking for more variety in veggies and those are three I like.