Pretty . . . weed

I was walking across the "lawn" from the parking lot to my office building this morning, and came across this lovely flower:

It's really quite pretty - if you look at the full-sized version of this photo, you'll see that each little blossom resembles a tiny little snapdragon flower.

In reality, this plant is really small. The flower couldn't have been more than an inch tall, if that. And I'm quite sure it's some sort of weed, as it was growing merrily across the grassy strip surrounding the parking lot. Plus, the leaves remind me of another weed found pretty much everywhere in Florida, the dreaded spurge. But I've never seen one with such pretty flowers.

I looked through the book "Weeds of Southern Turfgrasses," pulled from the shelf of my coworker and Master Gardener, Kim. Nothing - no tiny, low-growing weeds with itty-bitty-pretty flowers.

Perhaps someone will recognize it here? Hmm, I'm not sure how many botanists who specialize in Florida landscape weeds read my blog.