Vibrant green with lustrous leaves in the Spring, Poison Oak (Toxicodendron diversilobum) generally becomes less vivid with age, eventually turning red in the late Summer and Fall. The red color is due to anthocyanin pigments in the plant's sap that become unmasked as the leaf loses chlorophyll.

Brown seed stalks of Curly Dock (Rumex crispus) amid dried grasses and mustard on Laskey Mesa in Upper Las Virgenes Canyon Open Space Preserve (formerly Ahmanson Ranch).

Curly dock is a non-native invasive weed from Eurasia. The Cal-IPC Invasive Plant Inventory describes its impact as limited.

From a run at Ahmanson on September 13, 2006.

Sylvan Hairstreak (Satyrium sylvinus) on California Goldenrod (Solidago californica) at Sage Ranch Park.

A Southern Pacific Rattlesnake (Crotalus oreganus helleri) at Upper Las Virgenes Canyon Open Space Preserve (formerly Ahmanson Ranch).

Photograph of Foxtail Pine from the Cottonwood - New Army Pass Loop September 2, 2006.

The climb up the glacially sculpted canyon hadn't been too bad. How could it be on a day like this? Winds were light, and the temperature was refreshingly cool – perfect for running in shorts and a lightweight long-sleeve top. As I had worked up the Rock Creek trail, marmots, fat for the Winter, had whistled warnings of my approach and then waddled for cover. Amicable clouds embellished the high mountain sky, and sun-chased shadows quietly set the pace.

In late September 2005, the Topanga Fire burned many thousands of acres in the Simi Hills. One of the side effects of the fire was to reveal the extent of the refuse that was in the creek bed that runs east-west between Rocketdyne's Santa Susana Field Laboratory and Sage Ranch.

My plan had been to run out the Misha Mokwa Trail to the Backbone Trail, and then head west towards Sycamore Canyon. I needed to be back in the Valley before noon, so about an hour out I would head back. Running past Echo Cliffs, I tried to pick out some of the steep climbing routes, and contemplated delicately perched Balance Rock.

A bracket fungus (prob. Laetiporus gilbertsonii) on a burned eucalyptus in the Simi Hills.

It's mid-August, which means that Labor Day, and the Mt. Baldy Run to the Top, are only a couple of weeks away. There's nothing quite like the experience of racing to the top of a 10,000 ft. peak en masse with 500+ other runners.

There are three basic choices for running hydration: hand bottles, a waist pack, or a back pack. There are also various combinations of these basic themes. If you do much off-road running, chances are good you have at least one version from each category. Until recently I had not tried any of the waist packs with a horizontally oriented bottle. Why not?

We did this acclimatization run early in our running adventure in Peru. The grain field is on a plateau at about 11,000', and parallels the Sacred Valley of the Incas, and Urubamba River.