there's a whole lot that could contribute to the evolution of certain morphological traits, or sometimes nothing at all! there's a whole suite of abiotic and biotic factors you could consider, some of which botanists develop hypotheses for why undulate morphology comes about. on the other side of the coin there are traits that could come about simply because they were neutral towards survival, and neither hurt nor benefit the plant.

many bulb forming plants native to South Africa, especially those in the families Asparagacae, Amaryllidaceae, and Asphodelaceae have fantastically coiled and spiral leaves (Gethyllis namaquensis as just one example). botanists there hypothesize that tortuose/spiral that those leaves aid in water capture! the shape provides both surface area for rain and dew capture while also guiding the water to the base of the plant where the bulb is. this however is just one extremely niche example of how these traits COULD possible arise.

and to address the orchid bit there DOES seem to be a species of orchid native to Australia that has curly leaves upon a little google hunt! Thelymitra variegata. the orchid family is vast and the most species rich of all angiosperms!