This is a cute little plant (syn. Tweedia coerulea) that is regarded either as a straggling subshrub or a scandent creeper that needs support to climb. My plant just used to flop untidily everywhere but now I have corralled it upright within a metal obelisk, and it looks a lot better. Oxypetalum coeruleum hails from Brazil and Uruguay. It has amazingly clear blue, star-shaped flowers that are quite long lasting; they appear in summer and early autumn, amidst heart-shaped, grey-green, velvety leaves.
Long, curved seedpods develop after the blooms fade, filled with downy-tufted seeds. Oxypetalum flourishes in a well-drained, sunny position. It is best grown from seed. It is marginally frost hardy. It doesn't seem to like intense humidity but has survived a few years so far in my garden.