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Global Range: Ranges over 2.81 sq km in Arizona. Also known from Yecora, Sonora, Mexico.

Astragalus hypoxylus was described from a collection made in the Huachuca Mountains in 1882. The description of the type locality, "Mahoney's Ranch, near Ft. Huachuca", was sufficiently vague that the site has never been relocated. The species was not seen again in the field until a collection in 1986 in the Patagonia Mountains. This population was located 3 miles south of Harshaw along the dirt road to Washington Camp. Searches elsewhere in the Patagonia Mountains have not extended the known range there by more than one mile.

Since that time other populations of A. hypoxylus have been located in the Huachuca Mountains. One population was found on the south-west side of the Huachuca Mountains near lower Bear Canyon in July, 1988. The Bear Creek population includes three sub- populations located at the Wakefield Camp turnoff just west of Bear Creek, south of the road 1/4 mile southeast of Bear Creek in a tributary (D. Gori et al. 1990), and about 3/4 of a mile west of Bear Creek (K. Johnson pers. obs.). Another population was located in Scotia Canyon in 1990.

Surveys were conducted in Sonora in 1988, 1989 and 1990, but no populations were found in Mexico. Further surveys in the Huachucas have located a population in Scotia Canyon approximately 5 1/2 miles northwest of Bear Creek. As many as 600 to 700 individuals were found there in the spring of 1991. The majority of the Scotia Canyon population is located on private land on the Peterson Ranch.

The plant was collected March 29 and March 31, 1997 (ARIZ 390294 and 390293) by T.R. Van Devender and A.L. Regina, in Yecora, Sonora, Mexico on north slope of Mesa Del Campanero and south of Maycoba on road to Moris (Chihuahua). In addition, T. R. Van Devender #2004-588, and A. L. Regina recently collected this plant from a cemetary in Yecora, Sonora, Mexico on 26 May 2004, determined by R.W. Spellenberg in 2005 (ARIZ 379027, NYBG 1267966). The species was reported to be abundant, mat-forming and in flower.


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Source: NatureServe

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