Hebenstretia
A small South African genus, annuals and perennials in the family Scrophulariaceae (like Nemesia & Verbascum).
Surely not deserving its usual common name 'Slugwort', the remarkable tubular flowers of this genus have all the appearance of being pollinated in their native African habitats by long-tongued hawk-moths or birds (perhaps sunbirds) but information on this is notably lacking. Perhaps hummingbird hawk-moths might attend them here, or nectar-thieving bees might bite their way to nectar? Who knows? If you find out please let us know so we can let everyone know!