Assessment of MacFarlane’s four-o’clock (Mirabilis macfarlanei) Element Occurrences in Idaho

Publication Type:

Unpublished

Authors:

Janice Hill; Juanita Lichthardt; Jennifer Miller; Sam Fuchs

Source:

Idaho Natural Heritage Program, Idaho Department of Fish and Game, Boise, Idaho, p.22, plus appendices (2020)

Call Number:

U20HIL03IDUS

Keywords:

canyon grasslands, Element Occurrences, MacFarlane’s four-o’clock, Mirabilis macfarlanei, Salmon River, Snake River, subpopulations

Abstract:

MacFarlane’s four-o’clock (Mirabilis macfarlanei Constance & Rollins), a perennial forb of the Nyctaginaceae family, is narrowly endemic to canyon grasslands of the lower Snake, Salmon, and Imnaha rivers in Oregon and Idaho. This plant species was originally listed as Endangered in 1979 and down-listed to Threatened in 1996. Currently there are 10 Element Occurrence Records (EOs, or population records) for MacFarlane’s four-o’clock in Idaho [Idaho Fish and Wildlife Information System (IFWIS) 2019]. Since several EOs have not been recently assessed, a comprehensive assessment of all known EOs in Idaho was initiated in 2012. This report documents four of these assessments conducted between 2012 and 2019: 1) Skookumchuck RNA/ACEC EO 1, 2) Horseshoe Bend EO 3, 3) Lucile Caves RNA/ACEC EO 7, and 4) Box Canyon EO 9. Assessments included mapping, collection of data on MacFarlane’s four-o’clock abundance, associated species, and disturbances. Plants and their habitats were photographed and rare plant observation forms were completed. <br>

In May 2017, we surveyed ~160 acres for MacFarlane’s four-o’clock plants between Lower Pittsburg Landing EO 6 and Kurry Creek EO 10. Additional plants were located that represented an extension of Subpopulation 2 of the Lower Pittsburg Landing EO 6; this extension placed EO 6 within 1 km of EO 10 and justified combining these two EOS into one EO.

Notes:

Reference Code: U20HIL03IDUS <br>

Full Citation: Hill, J.L., J. Lichthardt, J. Miller, and S. Fuchs. 2020. Assessment of MacFarlane’s four-o’clock (Mirabilis macfarlanei) Element Occurrences in Idaho. Idaho Natural Heritage Program, Idaho Department of Fish and Game, Boise, Idaho. Pp. 22, plus appendices <br>

Location: ELECTRONIC FILE - BOTANY: PLANT SPECIES: Mirabilis macfarlanei <br>

Keywords: MacFarlane’s four-o’clock, Mirabilis macfarlanei, Element Occurrences, subpopulations, Snake River, Salmon River, canyon grasslands <br>

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