[Dr. Blake tells me he's tired of Tucson entries. Too bad. We're in beautiful Tucson for another week. Besides, how could anyone be tired of Tucson?] Thousands of people escape more bloom-filled parts of the country and head to the desert in a vainglorious attempt to avoid pollen, allergies. And waiting there to greet them, the palo verde, in bloom and fully loaded on just about every block. Or, in this case, along the dry Santa Cruz riverbed which serves as my early-morning Tucson running route before it gets too hot. Or too pollenated.