(Torr. exA.Gray) Barneby
Psorothamnus arborescens is a species of flowering plant in the legume family known by the common name Mojave indigo bush.
Psorothamnus arborescens is native to southwestern North America, where it can be found in many types of desert and dry mountainous habitats. It grows at 100–1,900 metres (330–6,230 ft) in elevation.
It is found in the Californian Mojave Desert and Colorado Desert, south into the Sonoran Desert in Northwest Mexico, east past the Sierra Nevada into the Nevada Great Basin desert, and west into the San Bernardino Mountains of Southern California.
Psorothamnus arborescens is a shrub growing no more than 1 metre (3.3 ft) tall, its highly branching stems sometimes with thorns. The leaves are each made up of a few pairs of green linear to oval leaflets up to a centimeter in length.
The fruit is a glandular legume pod up to a centimeter long containing one seed.
The varieties of this species are generally similar in appearance but more restricted in distribution:
- Psorothamnus arborescens var. arborescens (syn: Dalea fremontii var. saundersii (Parish) Munz) - southwestern Mojave Desert, 400–800 metres (1,300–2,600 ft) elevation.
- Psorothamnus arborescens var. minutifolius - White and Inyo Mountains, Mojave sky islands, east of Sierra Nevada, 150–1,900 metres (490–6,230 ft) elevation.
- Calflora Database: Psorothamnus arborescens (California Dalea, Mojave indigo bush)
- Jepson Manual eFlora (TJM2) treatment - Psorothamnus arborescens
- USDA Plants Profile for Psorothamnus arborescens
- Psorothamnus arborescens - U.C. Photo gallery
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