100 Species #41: Common blue violet
These were the first common blue violets (Viola sorora) to pop up in the yard, now they're all over the place.
Violets are the weed that no one minds. They have cheery little flowers that may be in bloom anytime between April and November (judging by my posts tagged with "common blue violet"), their foliage is a nice low ground cover, and if you get tired of them, you can eat them.
Common blue violet was 365 urban species #103, and appeared in my Daily Urban Nature Pictures three times.