MacFarlane's four-o'clock (Mirabilis macfarlanei) is a perennial plant with a deep-seated, thick tap-root and spectacular bright magenta flowers. The flowers form in clumps of four to seven, and each flower is up to an inch long and an inch wide. This species typically blooms in May to mid-June. Based on limited monitoring conducted by the Bureau of Land Management, individual plants have been observed to live well over 20 years. MacFarlane's four-o'clock occurs in steep river canyon grassland habitats that are characterized by regionally warm and dry conditions. In these habitats less than 12 inches of precipitation occurs, mostly as rain during winter and spring. Thirteen populations of MacFarlane's four-o'clock are currently known. Three of these populations are found in the Snake River Canyon area (Idaho County, Idaho and Wallowa County, Oregon), seven in the Salmon River area (Idaho County, Idaho), and three in the Imnaha River area (Wallowa County, Oregon). The total geographic range of the species is an area of approximately 29 by 18 miles.