Kenneth D. Heil

Pediocactus bradyi subsp. winkleri, commonly known as Winkler's cactus or Winkler's pincushion cactus, is a small cactus endemic to the state of Utah in the United States. It is known only from Emery and Wayne Counties.

Sclerocactus sileri, the Siler fishhook cactus, is a rare and very small cactus found mostly in mineral-rich desert areas of intermediate elevations, notably in the American states of Utah, Nevada, and northern Arizona.

Sclerocactus brevispinus is a rare species of cactus known by the common name Pariette cactus. It is endemic to Utah in the United States, where it is known only from the Pariette Draw, a draw in Duchesne County. It is threatened by a number of processes and human activities.

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Penstemon bleaklyi, the Bleakly Penstemon, is a rare species of plant from the mountains of northern New Mexico and southern Colorado. It is one of the penstemons in the veronica family.

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Asclepias sanjuanensis, the San Juan milkweed, is a species of milkweed native to northwestern New Mexico. This species is restricted to the Four Corners area and is only present in San Juan County in New Mexico.

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