Onion Mystery Solved

I was planting wildflower seedlings outside and I kept smelling onions. I looked around for onion grass, you know, those clumps of slender hollow green stems that grow everywhere and smell like onions when you step on them? Found none. There were just some simple pale lavender flowers like the one above. I didn't recognize this flower, but was able to identify it as a spring starflower, Ipheion uniflorum. Click to enlarge.

Guess what made the identification easy -- the grassy leaves of spring starflowers smell like onions when crushed.

So I'm adding this to the list of flowers I know. I read that spring starflowers are native to Uruguay, Argentina, and Chile, but planted here as ornamentals. The ones around my place seem to have become established in the grass. They are short lived and will be gone by summer.