I've grown monarda under my black walnut for years, but it is the native variety. Don't know about the cultivars, but it seems to me that if one monarda does well, they all should.

Thanks! This particular plant recently died from powdery mildew, which leads me to suspect that that was the culprit for the plant's wilt and prolonged suffering. But no worries; 'Jacob Cline' is native, so it should live near the walnut, as well as powdery mildew resistant, and the all important hummingbird attractant. Looking forward to planting it next spring.

As an update to my question, I have grown two species of Monarda, and both have done well. The first is Wild Bergamot (Monarda fistulosum), which many online websites accurately list as tolerant. The second is 'Jacob Cline' Beebalm (Monarda didyma 'Jacob Cline'). It flowered nicely this year, and never once showed signs of juglone intolerance. I hope this can help others in the future.