I have been growing canna for the last 20 years. I have both the red leaf ones and the green leaf ones. Please listen to what Ken said. Depending upon were you are located, you may have to dig up the bulbs in fall. I started with only a few of these bulbs and now I give to my friends & local greenhouse for them to sell as I am overwhelmed with too many of these bulbs. They are a beautiful plant in my opinion.

I have no personal experience of this but could it be Zephyranthes Candida, commonly called the rainflower because it blooms after rainfall? Have a look on here: http://www.pacificbulbsociety.org/pbswiki/index.php/Zephyranthes Whatever, it is very pretty.

Token has it right, common names are evening primrose and nine o clocks. You can watch these flowers open, right before your eyes, as they open very quickly & sometimes they will even shake a bit-we always watched them as children & I still enjoy doing so. They get lanky & weedy looking but I always let some reseed to watch open & show others. Look for the fattest bud in the early evening, then check about dusk & you will soon have their schedule. Mine opened about 8:45 pm last night. The blooms close during the day but will linger if it is overcast or rainy. Susan

My Allium Moly looks like this. Just bloomed and I'm in zone 4/5. The first blooms are going to seed. Very pretty, dainty flowers. So many of my other flowers aren't ready to bloom and this one looks so nice.