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Leonotis nepetifolia
Plants on average 1 m tall with flower heads in tandem on a single stalk.
Tropical leeward valley.
Spotted in Makua-Keaau Forest Reserve. This species, native to Africa, is a pest, and often considered invasive, in Hawaii.
Lenny, thanks for the ID. I've updated the spotting. FYI, identification was not possible in the initial post, because when I saw it, it was identified to me verbally, and the name sounded like "Leonidas." Immediate follow-up clarification was not possible. Later online searches kept returning references to the Spartan leader of the 300 at Thermopylae!