This vine has opposite leaves, and the inflorescence looks like a very long chain. The attached were the best possible with a zoom lens. Any help appreciated. I've tried several searches, but to no avail.
I would say it looks like Thunbergia mysorensis. You didn't say where you were when you took it, so I can't check if it should occur there. I will temper this by saying that I thought Forest and Kim Starr's photo at the link below was that, and they don't feel confident enough of the species to agree. starr-980529-4301-Thunbergia_sp-flowers-Enchanting_Floral_Gardens_of_Kula-Maui.
Thanks for your thoughts, Wendy. I thought Thunbergia also, but the flowers don’t match the several pix I have of T. mysorensis. This flower is fully open in the pic that shows the red petals standing up like rabbit ears. The vine is in a green house at the Blue Lotus Water Garden just outside Melbourne. The staff there don’t know what the plant is (may have come in with something else they ordered); they said the main bloom time was December.. Other plants in the greenhouse are: Nymphaea gigantea, Victoria cruziana, Canna spp, Cyperus papyrus, Hibiscus coccineus ‘Alba’ Closed fower = 1 inch / 25 mm; Inflorescence = +/ ~ __ mm ± 3 ft/1 meter; Leaves opposite. The closest I came to was Thunbergia coccinea, but have not found a systematic description yet. thunbergia coccinea description - Google Search thunbergia coccinea description - Google Search Thunbergia coccinea (Scarlet Thunbergia) - Welcome to Jardim Orquídea
You were spot on, Wendy - I sent a photo of T. mysorensis to Blue Lotus Water Gardens, and they confirmed the flower was the same in December. Currently, the inflorescence has only a few distal flowers, with all the others gone. Well done!
