The following Participating Institutions are custodians for this species in the CPC National Collection:
The Arboretum at Flagstaff
The conservation of Salix arizonica is fully sponsored.
Joyce Maschinski, Ph.D. contributed to this Plant Profile.
Arizona willow is a small shrub that forms prostrate mats, single shrubs, or large hedges or thickets ranging from several centimeters to 3 m tall, but typically less than 8 dm tall. Its shiny oval leaves have finely serrate margins and are gland-tipped. Young stems of this species are bright red, and flowering occurs between the months of April and July. (Arizona Game and Fish Department 1999)
The Arizona willow was proposed for listing as an endangered species with critical habitat in 1992, known at that time only from Mount Baldy in east-central Arizona. New populations discovered in southern Utah in 1994 have expanded the known range and, subsequently, the Arizona willow was withdrawn from listing in April 1995. Specimens identified as Salix arizonica (by R. Dorn and D. Atwood) were collected from New Mexico in 1995-1996 (deposited at the UNM Herbarium), further expanding its range to the north-central mountains of New Mexico. (USFWS 1995)
Distribution & Occurrence
- New Mexico
This species is found in high elevation (8550 to 10000 ft, or 2608 to 3050 m), unshaded to partly shaded, wet meadows, streamsides, and cienegas. Soils are moist and not very rocky. (Arizona Game and Fish Department 1999)
Often co-occurs with other willow species, including Salix monticola, S. geyeri, S. bebbiana, S. boothii. Salix arizonica can be distinguished from these other species by its glabrous (shiny) leaves--all other Salix species in the area have glaucous (white, frosted) leaves.
|8 populations in Arizona, 4 in New Mexico, and 5 in Utah. The Utah populations are extremely large with thousands of individuals.|
Conservation, Ecology & Research
Clonal populations appear to be more susceptible to a rust disease, especially when habitat conditions are stressed. This rust disease can damage or even kill a plant. (Brooks 1999)
Water impoundments and diversions
Rust infection (unidentified)
Invasive, non-native plants
(USFWS 1997; Arizona Game and Fish Department 1999
A depauperate population in Arizona on Stinky Creek was augmented with approximately 100 caged individuals. Once through an establishment period, the willows persisted, but there is no evidence of seed germination.
Cages protecting the Arizona populations should be repaired.
Studies on the biology and ecology of the unidentified orange rust that has been found on some populations of this species.
Kearney, T.H.; Peebles, R.H. 1973. Arizona flora. Berkeley, CA: University of California Press. 1085p.
Rutman, S. 1992. Handbook of Arizona's endangered, threatened, and candidate plants. Phoenix, Arizona: U.S. Fish & Wildlife Service.