I grew up eating Manoa lettuce in Honolulu. It was the best fresh vegetable available, and almost the only one that was truly local. (In the stores even bananas mostly came from central or south America, even though they were growing all over Oahu.) Manoa lettuce is an outstanding leaf lettuce!!
It’s never seen in the stores on the Mainland, as far as I know – I’ve never seen it. But a couple of months ago, we found seeds in our newly relocated Uwajimaya store (where Larry’s used to be.)