An assortment of new tree species are working their way into the desert landscape palette. Some are already well on their way to being accepted and widely used in landscape designs while others are in limited production. Still others are being evaluated in both nursery and landscape settings. Listed below are some promising species. Acacia caven (Espino Caven) is a semi-deciduous South American native, yellow, fragrant, spring flowers with a moderate growth rate. Matures to 25’. Acacia eburnea (Arabian Acacia) is a deciduous Southwest Asian native that matures to about 15 to 20 feet tall. The dark gray-green dense foliage contrasts with long white thorns and bright yellow spring and summer ball flowers. Acacia erioloba (Camel Thorn) is semi-evergreen and very large at maturity standing 30 to 50 feet. Native to Southern Africa, it grows at a slow to moderate rate, producing golden-yellow flowers in summer. Giraffe Thorn is an excellent focal point specimen, to mark entry areas or a perimeter planting. It develops a broad, dense canopy. Acacia karroo (Karroo Thorn) is a broad, spreading, deciduous tree that is native to Africa. It matures to 20 to 30' tall and 20 to 40' wide. Long white thorns are produced along zig-zaging branches. Produces golden-yellow flowers in summer. Acacia occidentalis (Sonoran Tree Catclaw) is deciduous, broad canopied Mexican native. It grows quickly to 20 to 40', produces cream-colored flowers in spring and blends in with most popular desert landscape species. Acacia pendula (Weeping Myall) is an Australian evergreen with a moderate growth rate that matures to 15 to 25' tall but not as wide. It produces yellow flowers from late winter to early spring and has a weeping, graceful silvery leafed canopy. It color (both leaves and flowers) and weepy form make it an excellent accent tree. Geoffroea decorticans (Chilean Palo Verde) is a uniquely sculptural tree with an open, lacy canopy that casts filtered shade. It matures to 15 to 25' tall and 15 to 30' wide, producing papery yellow flowers in spring. Naturally peeling bark give the trunk(s) a green/tan mottled appearance. Pithecellobium mexicanum (Mexican Ebony) is native to the Mexican states of Sonora, Sinaloa and southern Baja. Its blue-green foliage is deciduous, hardy to 15 F and armed with cat-claw like thorns. It grows at a rate between Thornless Mesquite and Blue Palo Verde. Matures to 20 -30’ tall by 20 to 25’ wide. Cream colored blooms appear in March and April.