Someday I hope to see this plant - our Wednesday's weed - in its native range in eastern Europe and north central Asia, because it's a shame something so pretty does so much damage! If you live in the American west you're probably familiar with this plant, Halogeton glomeratus, called saltlover. It can grow in disturbed areas where native plants struggle to take hold, and is perfectly happy growing in salty, briny, and alkaline locations. Once it's taken hold, it's really hard to fully remove, because it produces a lot of seeds and concentrates mineral salts in such a way that it makes its surroundings inhospitable to other plants. Worse, it's very toxic to livestock like sheep, and has killed entire herds in the past.
I found this plant at Dead Horse Point in Utah, USA. It's a little more plain when it's not flowering or going to seed, looking more like an amaranth/pigweed.
