Robert Donald Dorn

Salix boothii is a species of willow known by the common name Booth's willow. It is native to western North America from British Columbia and Alberta south to California and New Mexico. It grows in moist mountain habitat, such as riverbanks.

Salix arizonica is a species of willow known by the common name Arizona willow. It is native to the southwestern United States, where it occurs in Arizona, Colorado, New Mexico, and Utah. This shrub varies in size and shape, occurring in low mats or upright, sometimes forming thickets. It reaches 2.6 to 3 meters in maximum height. The branches are often bright red in color, while the smaller twigs are yellowish, reddish, or brownish, with a coating of hairs. The leaves are generally oval in shape and have smooth or serrated margins. The shiny leaf blades are up to 5 centimeters long. The

Descurainia incana is a species of flowering plant in the mustard family known by the common name mountain tansymustard. It is native to much of North America, including most of Canada, the western United States, and Baja California. It is known from many types of habitat. It is a biennial herb with a slender, greenish, often hairy stem sometimes exceeding a meter tall. The leaves are narrowly to widely oval in shape, the lower ones lobed and sometimes compound, the upper generally unlobed. The mustardlike inflorescence is a series of developing fruits beneath an elongating cluster of small

Boechera fecunda (syn. Arabis fecunda) is a species of flowering plant in the mustard family known by the common names Mt. Sapphire rockcress and Sapphire rockcress. It is endemic to Montana in the United States, where there are twenty known occurrences in three counties.

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Penstemon gibbensii is a species of flowering plant in the plantain family known by the common name Gibbens' beardtongue. It is native to the western United States, where it occurs in Wyoming, Colorado, and Utah. This species grows up to 20 centimeters tall. It has linear or lance-shaped leaves oppositely arranged on the stems, the longest reaching 9 centimeters in length. The tubular blue flowers are up to 2 centimeters long. Blooming occurs in June through September, typically in response to adequate moisture. There are a total of nine known occurrences in three US states. The species is

Boechera sparsiflora (formerly Arabis sparsiflora) is a species of rockcress known by the common names sicklepod rockcress and elegant rockcress. It is native to western North America from California to Utah to Yukon, where it can be found in a number of habitats. This is a coarsely hairy perennial herb growing one or more thick stems from a caudex. The stem may branch or not and it reaches up to 90 centimeters in maximum height. The leaves vary in shape from linear to arrowhead-like and may or may not have toothed edges. They are usually hairy and up to 8 or 10 centimeters long. The raceme

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Yermo xanthocephalus commonly known as the desert yellowhead is an American flowering plant endemic to southern Wyoming. It is the only member of the genus Yermo and was first described in 1991.

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Boechera falcatoria (formerly Arabis falcatoria) is a rare species of flowering plant in the family Brassicaceae known by the common name Grouse Creek rockcress. It is endemic to Utah in the United States, where it is known only from Box Elder County. It has been reported from neighboring Nevada, but these reports are likely based on misidentifications.

Boechera cobrensis (syn. Arabis cobrensis) is a species of flowering plant in the mustard family known by the common names Masonic rockcress and sagebrush rockcress. It is native to the western United States from eastern California to Wyoming, where it is found in sandy habitat, especially sagebrush. This is a perennial herb growing several erect, slender stems to heights near half a meter from a branching caudex. The plant forms a narrow clump with a base of narrow, linear, densely hairy leaves up to 5 centimeters long. There are also a few slightly shorter leaves clasping the stems at

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