The Terraced Swale lining 8th Avenue

The Urban Arboretum: Terraced Swale

Scroll through the gallery to learn about the plants you will find at Amazon Frontier. Click the button below or header image to return to Stop Eight.

Urban Arboretum: Stop Twelve

November 02, 2022
Species at Terraced Swale
Lobamandra hystrix ‘Tropic Belle’
This species is a member of the Lomandra genus, comprised of around 50 ‘mat rushes.’ These tufted plants grow long, narrow, blade-like leaves. Here, you can see them lining the street and benches. They are native to Australia.
Lobamandra topcibelle
A closer look at the blade-like leaves of Lobamandra hystrix ‘Tropic Belle’.
Species at Terraced Swale
Nyssa sylvatica
Commonly known as a black tupelo or black gum tree. This specific species is also called the 'green gable." If you're here in spring or summer, look for dark green, highly glossy leaves. In the fall, you're in luck. This tree turns a vibrant crimson before shedding its leaves for the colder months.
Species at the Terraced Swale
Carex tumulicola
Look down from the green gable tree at the grass-like sedge planted in the bed. This plant, Carex tumulicola, is the foothill sedge. This plant is widely distributed in Washington and California. It is popular in landscaping as a formal groundcover under shrubs or trees, which is why we've paired it with the green gable. The spreading roots also help to control erosion.


In this picture, the foothill sedge is planted along the staircase leading to the Nitro Plaza.
Species at the Terraced Swale
Blechnum spicant
Also known as the deer fern. This evergreen fern is a bit unique as it has two different types of leaves, or 'fronds'. The evergreen sterile fronds are stiff, leathery and dark green, forming the rosette shape at its base. As the season progresses, these fronds may stretch to lie on the ground. The second frond are the fertile fronds, which grow in an upright position in the center of the rosette. They look very similar but are taller, thinner, and widely spread out. The most distinct difference is that fertile fronds will turn brown and fall from the plant by the end of the warmer months.
Species at the Terraced Swale
Iris macrosiphon
Also called the bowltube iris. This flowering plant is native to the Cascade Foothills, north and central Sierra Nevada Foothills, and San Francisco Bay Area, where you might see it growing in sunny grasslands, meadows, and open woodlands.
Species at Terraced Swale
Hemlocks, a type of pine, are assigned to the Tsuga genus. The hemlock tree got its name because when its needles are crushed, the smell resembles that of the plant poison hemlock. Not to fear, the hemlock pine, as with all Tsuga species, is not poisonous.