Photo: Diane Edwardson. April 7, 2009. The grass was just starting to dry out eleven days ago on the Corralitas Staircase. (Click on photo to enlarge.)
Photo: Diane Edwardson, April 18, 2009. Today, the hills have completely dried and the seeds are everywhere, waiting to be snorted up your dog's nose, stuck in their ears or between their toes. (Click on photo to enlarge.)
UPDATE 4-22-09: Thanks to a reader for identifying this as Common Wild Oats (Avena fatua), a non-native invasive species.