Redding Arboretum Area
Field Trip, April 23, 2024

Arboretum walk attendees. D. Mandel.
Redding Arboretum area walk attendees listening to walk leader David Ledger on April 23, 2024. Photo © Doug Mandel.

This weekday field trip along the Sacramento River Trail near the Redding Arboretum brought out 12 people to learn some of the many plants on the trail. Each participant was given a plant list of over 100 species that occur along the trail.

We started out under a huge oak tree at Turtle Bay parking lot and identified many native plants on the short jaunt to the Sundial Bridge. Walk leader David Ledger identified white alder, California bay, interior live oak, cottonwood, snowberry, and a blooming black locust.

David Ledger and black locust on Sundial Bridge. D. Mandel.
Walk leader David Ledger pointing out the blooming black locust, Robinia pseudoacacia, from the Sundial Bridge, Redding. This tree is non-natve to California; native to eastern USA.
Photo taken April 23, 2024, © Doug Mandel.

Across the bridge, we saw pipevine in fruit, Oregon ash, arroyo willow, blue elderberry, false indigo, soap plant, coffeeberry, blue oak, white-leaved manzanita, and common manzanita. We also saw skunkbrush, a close relative of poison-oak.

Western poison-oak. D. Mandel. Redding Arboretum. April 23, 2024.
Western poison-oak, Toxicodendron diversilobium, with its well-known leaves of three.
Skunkbrush. D. Mandel. Redding Arboretum. April 23, 2024.
Skunkbrush, Rhus aromatica, also has leaves in threes. Photos © Doug Mandel.

We also found a terrible invasive: oblong spurge, a poisonous plant that can cause temporary blindness if the latex sap were to get in your eye. This invasive plant is fairly new to Shasta County, but is spreading rapidly. We saw two large patches of well over 100 plants, each.

Oblong spurge. D. Mandel. Redding Arboretum. April 23, 2024.
Oblong spurge, Euphorbia oblongata, is a noxious weed from Eurasia. Its sap can cause skin irritation.
Oblong spurge is spreading. D. Mandel. Turtle Bay. April 23, 2024.
Oblong spurge appears to be spreading rapidly in Shasta County. Photos © Doug Mandel.

More pleasant plants included valley sky lupine, fiddleneck, yerba santa, gumplant, and many beautiful purple round-toothed ookow. For a few, this walk was an introduction to native plants, while others already knew many of the plants we saw on this easy two-mile walk. ~David Ledger

David and walk attendees. D. Mandel.
David, left, pointing out the characteristics of a particular plant on the walk along the Sacramento River Trail near Redding Arboretum on April 23, 2024. Photo © Doug Mandel.