The flowers are 1 inch (2.5 cm) wide and have 5 petals. The top petal turns from a bright yellow color to orange as the flower ages. The flowers are followed by necklace-like, brown bean pods. The distinctive leaves are bipinnately compound with 6 to 9 inch (15 to 23 cm) long, needle-like, green midribs and 10 to 40 pairs of small, elliptical, green leaflets that are often quickly shed. The branches have spines and the photosynthesizing bark is yellow-green in color.

Santa Catalina Mountains.
Molino Basin Campground
Location: Shoulder of campground road.
9/24/15

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