That is a very handsome plant, you say would make a good creeper. This info is from cobi.org, and no I can't identify it although it looks so familiar. Can confirm its edible though by this information:
Sorry I can't help you further, although I have had good results from taking strange looking flora to a garden nursery for identification. They have books and catalogues which they can use for immediate identification. That is what I would do if I had a leaf from this plant. I also find the dept. of agriculture in Ontario very helpful. I don't know where you live.
Title: Gel extracted from Khruea-ma-noi (Cyclea barbata Miers) leaves: chemical composition and gelation properties.
Personal Authors: Arkarapanthu, A. Chavasit, V. Sungpuag, P. Phuphathanaphong, L.
Author Affiliation: Institute of Nutrition, Mahidol University, Salaya, Phutthamonthon, Nakhon Pathm 73170, Thailand.
Editors: No editors
Document Title: Journal of the Science of Food and Agriculture
Abstract:
Gel extracted from Khruea-ma-noi leaves, which are widely consumed by villagers in Northeast Thailand, has a unique characteristic that could be used for food and nutritional applications, such as in therapeutic diets and in the food industry. Since little is known scientifically about this plant, this study identified the plant's scientific name and determined the chemical composition of the Khruea-ma-noi polymer and its gelling mechanism. Results reveal that Khruea-ma-noi is classified as Cyclea barbata Miers. Its main polymer is polygalacturonic acid of average molecular weight 741 kDa with 66.3% methylated. Dried powders of extract and purified gels contained 415 and 724 g kg-1 of soluble dietary fiber and 7.1 and 13.9 g kg-1 of divalent cations, respectively. Factors affecting gelling ability and characteristics include phenolic compounds, oxidizing and reducing agents, pH, divalent cations and temperature. Most gels formed were thermoreversible except at pH 7.
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