Sunday, February 17, 2013
Two species of filaree grow side by side in the Sonoran desert. One is a bright purple native, Erodium texanum. The other is a lavender or pink flowered species, Erodium cicutarium, that was introduced to North America from the Mediterranean region hundreds of years ago. The long pointed seed pods of both species inspired the name "heron's bill" or "stork's bill." When the seeds detach, they form coils that expand and contract with moisture, effectively drilling the seed into the soil.