Population monitoring of grimy mousetail (Ivesia rhypara var. rhypara) and Crosby’s buckwheat (Eriogonum crosbyae)

EXECUTIVE SUMMARY
This document summarizes monitoring of Ivesia rhypara var. rhypara (grimy mousetail) and Eriogonum crosbyae (Crosby’s buckwheat) on land managed by the BLM Lakeview District. In 2016 we revisited 5 special status plant sites in Guano Valley, Lake County, OR: 1 site for I. rhypara var. rhypara and 5 for E. crosbyae . In addition, we revisited 1 E. crosbyae site in Fish Fin Rim, Harney County, OR.
• A total of 37 I. rhypara var. rhypara plants were counted at the site in Guano Valley, Lake County, OR.
o There were 17 vegetative individuals, 20 reproductive individuals, and no seedlings observed.
o There were 18 fewer plants observed than when the I. rhypara var. rhypara monitoring study was initiated in 1990.
• A total of 3524 E. crosbyae plants were counted across 5 sites in Guano Valley, Lake County, OR and 1 site in Fish Fin Rim, Harney County, OR.
o Of the 3524 plants counted, 177 were seedlings, 616 were vegetative, and 2731 were reproductive.
o Populations ranged in size from 28 to 1589.