Abstract: This is intended as a checklist for the Intermountain Region, here taken to mean all of Nevada and Utah plus portions of eastern California, southeastern Oregon, southern Idaho, southwestern Wyoming, and northern Arizona.
Notes: The listing is based on the treatments in the Intermountain Flora but the family treatment is that of APG. There are also some changes in the nomenclature of lower ranks, particularly for taxa in the earlier volumes of the Intermountain Flora. The list also includes several species known only as cultivated species, whether for ornament, education, or agriculture, some of which have to be grown or overwintered in the greenhouse. Species described as being cultivated outside may, of course, esca