From the Three Points - Mt. Waterman trail run on Sunday.

Five miles of (mostly) downhill to go. Running through an old growth forest of Jeffrey Pine, Sugar Pine and Incense Cedar, I relished being on a pine needle covered trail at 7000 ft. in the San Gabriel Mountains.

From the rocky summit of Castle Peak I traced the course of Bell Creek into the San Fernando Valley, imagining the broad valley as it might have been a few hundred years before.

Blue oak (Quercus douglasii) is a characteristic oak of the lower elevations of the Sierra foothills and coastal mountains, its range essentially encircling California's Central Valley.

Based on its reported range, Upper Las Virgenes Canyon Open Space Preserve (formerly Ahmanson Ranch) contains one of the southernmost populations of blue oak within its range. However, the predominate deciduous oak in the area is valley oak (Quercus lobata), and occurrences of blue oak appear to be rare. Regional climate modeling suggests that over the next century the range of blue oak could shift northward and diminish to nearly 60% of its current range.

Blue oak is reported to hybridize with valley oak, however a 2005 study suggests hybrids of these species may be more rare than generally accepted.

The photograph of the leaves of a blue oak was taken on a run along East Las Virgenes Canyon to Lasky Mesa on April 24, 2007. A valley oak immediately adjacent to this blue oak was killed in the 2005 Topanga Fire.

Related posts: Valley Oak Savannah, Laskey Mesa Oak

Technical papers:

Modeled regional climate change and California endemic oak ranges.
Kueppers, L.M., M.A. Snyder, L.C. Sloan, E.S. Zavaleta, and Brian Fulfrost. 2005. 
Proceedings of the National Academy of Sciences of the United States of America, 102(45): 16281 – 16286.

Limited hybridization between Quercus lobata and Quercus douglasii (Fagaceae) in a mixed stand in central coastal California.
Kathleen J. Craft, Mary V. Ashley and Walter D. Koenig.
American Journal of Botany. 2002;89:1792-1798.

One of the best indicators of seasonal rainfall I've found in the oak woodland and chaparral areas of Southern California in which I run is Elegant Clarkia (Clarkia unguiculata). In a wet year it can grow more than 6 ft. tall. This year it is the shortest I've ever observed -- about 5 inches in this photo taken near Lasky Mesa.

Related posts: Elegant Clarkia, Dealing With Drought

Running down the Silver Moccasin Trail from Shortcut Saddle to West Fork a couple of weeks ago, I mentioned to my running partner that a few years before, I had carried my whitewater kayak down the trail. Around 1995, Gary Gunder and I started exploring the creeks and rivers of Southern California, looking for hidden gems that rarely - if ever - had been paddled. Kayaking these streams has been an incredible experience, and has enabled us to see some of the wildest and most beautiful places in the mountains of Southern California.

A closer look at the feathery blossoms of the holly-leaved cherry (Prunus ilicifolia) reveal a peculiar flower whose many stamens resemble the tentacles of a sea anemone.

Holly-leaved cherry is a member of the genus Prunus -- the same as apricots, peaches, plums and cherries. As is the case with other species in this genus, the seed and leaves may contain hydrogen cyanide. It produces a small, thin-fleshed fruit favored by coyotes.

The photograph was taken on the slopes of Rivas Canyon near Will Rogers State Historic Park, while doing the route described in the post Will Rogers - Temescal Loop. Once again the weather for this (approximately) 21.5 mile loop was post-card perfect. A Google Earth image of a GPS trace of the route is available in the earlier post.

This photograph of goldfields (Lasthenia spp.) was taken on a run on Lasky Mesa in Upper Las Virgenes Canyon Open Space Preserve almost exactly one year ago. This April I haven't seen any goldfields on Lasky Mesa. The soil is too dry for the seeds to germinate. The drought in Southern California has suppressed or delayed the growth of these, and many other species of wildflowers.

Bush monkeyflower (Mimulus aurantiacus) readily hybridizes, producing a myriad of forms and colors, and some interesting work for botanists. This plant pictured above may be a hybrid of local salmon and scarlet colored forms.

From a run near Sage Ranch on March 26, 2007.

Of all the faces of Los Angeles perhaps the least well known is the Angeles High Country. Entirely within the County of Los Angeles, the lofty peaks and chiseled canyons extend from Mt. Waterman on the west to 10,064' Mt. Baldy  on the east. It is rugged and wild -- the home of ancient trees, big horn sheep, black bears and mountain lions.

This view of the crest is from the Rim Trail, on the steep eastern shoulder of Mt. Wilson. From left to right the prominent peaks are Mt. Waterman (8,038'), Twin Peaks (7761'), Mt. Baden-Powell (9,399'), and Mt. Baldy (10,064'). The lack of snow is indicative of the meager amount of precipitation we've had this Winter.

We were running the Rim Trail as part of an approximately 22 mile loop from Shortcut Saddle on Angeles Crest Highway to Mt. Wilson and back. The loop incorporates several segments of the new 50 mile course that is part of the Mt. Disappointment 50K/50M Endurance Run.

The segments of the loop that are on the 50 mile course are the Silver Moccasin Trail, Gabrielino Trail, Kenyon-Devore Trail, and the Rincon-Edison Road. Here's a Google Earth image and Google Earth KMZ file of a GPS trace of the route.

Much of the winding 5.6 mile climb out from the W.F. San Gabriel River on the Rincon-Edison Road is steep and shadeless. Rincon-Edison Road is also used (under permit) by off-road vehicles -- we encountered two dirt bikes and a jeep.

Runner on a track that connects Rocky Peak fire road to Las Llajas Canyon in Rocky Peak Park. From the top of this hill there is approximately 4 miles of fast downhill through a scenic canyon garnished with out of service oil wells and a gurgling creek.

Related post: Chumash - Las Llajas Loop.

Ants forage among the blossoms of Eastwood manzanita on the Chumash Trail in Rocky Peak Park. From a run on Wednesday, March 21, 2007.

Some related posts: Chumash-Las Llajas Loop, Chumash-Hummingbird Loop, San Fernando Valley from Rocky Peak, Chumash Trail Snow.