The USDA’s Natural Resources Conservation Service has online (and, indeed, downloadable too), interactive, polyclave identification keys for American grasses and legumes, by state. It’s unclear to me from the introduction whether these cover all grasses in each state, or only the ones which occur in wetlands. In any case, they are for testing purposes only at this stage. But the multi-entry keys are much easier and efficient to use than conventional dichotomous keys. And there are a lot of crop wild relatives included (e.g. see Phaseolus in New Mexico in the screenshot thumbnail below). I don’t think the keys have been build using LUCID (at least I don’t see any reference to it), which seems a bit like re-inventing the wheel, but anyway, better keys are always worth having.
