The lovely spring flower is a bulb, Ipheion uniflorum, Spring
Starflower, native to South America. The foliage should
have a slight onion/garlic odor when crushed. The bulbs
naturalize well.
Each stem bears a single flower, hence the name:
uniflorum, "one flower". Sisyrinchium may have several
flowers on a stem.The foliage is also different.
Ipheion is in Lily family; Sisy. is in Iris family

Emilie
NorCal