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Cycladenia humilis var. jonesii
Also called Jones' Waxydogbane, Jones' Cycladenia, Jones' Waxy Dogbane
Cycladenia humilis var. jonesii, known as Jones cycladenia or Jones waxy dogbane, is a threatened variety of Cycladenia humilis. It is one of three varieties of the species, the other two occurring in California (var. humilis and var. venusta).
At the time of its listing as a threatened species, Jones cycladenia occurred in four known areas in the Canyon Lands of southwestern Utah and northern Arizona. The populations were disjunct, occurring at least 100 miles (160 km) apart. It was estimated that 7,500 individual plants existed, but since many of the shoots belong to the same plant, this estimate may be too high. Jones cycladenia has exacting soil requirements, growing only on the gypsiferous, saline soils of the Cutler, Summerville, and Chinle formations. It occurs in plant communities of mixed desert scrub, juniper, or wild buckwheat and Mormon tea at elevations from 1,340 to 1,830 m (4,400 to 6,000 ft).
Text excerpted from the Wikipedia article Cycladenia humilis var. jonesii by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
