Photo: Astragalus whitneyi.

Closeup of balloons. Chiricahuas, AZ, US. Wild. 1998-04-01.
Astragalus whitneyi Gray Engl.: Balloonpod Milkvetch, Balloon Milk-vetch, Balloon Milkvetch. Bot. syn.: Astragalus hookerianus A. Gray var. pinosus (Elmer) Jepson, Astragalus hookerianus A. Gray var. whitneyi (A. Gray) M. E. Jones, Phaca argentata Rydb., Phaca whitneyi (A. Gray) A. A. Heller, Tragacantha whitneyi (A. Gray) Kuntze
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Photo: Astragalus whitneyi.