This is one of the most exclusive vegetables and finest edimentals out there, Megacarpaea delavayi (Brassicaceae), a plant found in the high mountains of southwest China at high altitudes (3000–4800 m), and one of the most beautiful! Flora of China says it grows in swampy meadows, grassy slopes and open thickets. It also states that it is used for medicine and as a vegetable. Consulting Google Scholar I found a paper “Eating from the wild: diversity of wild edible plants used by Tibetans in Shangri-la region, Yunnan, China” by Yan Ju et al. (2013) which states that the young stems and leaves are used.
I purchased two young plants I found for sale in a small selection of plants for sale at the Gothenburg Botanical Gardens shop in Sweden in 2011. They took two years to flower and set seed in a shady, dry spot in my garden. It is thought that Megacarpaea can be monocarpic (dying after flowering) but it did come back three more years but grew weakly and did not flower again. I therefore moved the plant to a new location in 2016 which was a bad move as it died…
Sadly, I never did get to eat some….
I put the seed I harvested on my seed list two years in a row and sent to a few people, so if you are one of them and have seed, I am very interested! I germinated some of those seed myself (picture), but I don’t recall what happened to them…