Friday, July 18, 2008
Also known as "the Poor Man's Weatherglass" because the flowers only open when the sun shines (though you could probably tell when the sun was shining just by looking at the sky and not the ground). They'll close when it's getting dark, or when the barometric pressure is dropping, indicating a coming storm.
This plant is originally from Europe, but is pretty common in San Francisco. I guess it's considered a weed by lots of folks. I think it's lovely.