Saturday, April 20, 2013, 9 a.m.: Lower Clamshell Road, Monrovia Wilderness Park: The primary objectives for this hike are to see Braunton’s Milkvetch (Astragalus brauntonii), a Federally listed endangered species, and Arabian Pea (Bituminaria bituminosa), the introduced plant that may threaten the milkvetch at this location. Along the way we will see many of the typical chaparral plants. Leader: Gabi McLean (626-966-0580, gabi.mclean [AT] verizon [DOT] net).
Description: This hike follows a dirt road along the front of the San Gabriel foothills. The first milkvetch is about 1.5 miles from the trailhead, so the round trip will be at least 3 miles. The elevation gain in the first mile will be about 330 feet, before the road goes slightly downhill. The weather forecast predicts temperatures in the 80s, so wear a hat and bring plenty of water.
Directions: [NOTE: Monrovia Wilderness Preserve is not at Monrovia Canyon Park.] From Foothill Blvd in Monrovia, take Canyon Blvd north for 0.7 miles. Just before the dead-end, turn right to continue on Canyon Blvd, east and north. After 0.3 miles, turn left onto Ridgeside Dr. at the large Oak Woods sign. (If you get to the sign pointing to the right to Canyon Park, you have gone slightly too far.) Drive up Ridgeside for 0.4 miles. Near the top of the hill, look for three addresses painted on the curb on the left (873, 889, and 905) at the beginning of a long, tall hedge. This is the location of the trail head. (If the road curves sharply to the right and begins to go back downhill, you have gone slightly too far.) Park on the street on either side. If you are using a telephone map or GPS, use the address 873 Ridgeside Drive, Monrovia. We will meet at the entrance to the driveway indicated by the three house numbers mentioned. When we begin the hike, we will walk up the driveway past a few houses before getting to the park gate.