Lomatium roneorum

Lomatium roneorum is described by Darrach (2018). "The new species produces more crowded and numerous glaucous leaflets, shorter blunt-tipped leaflets lacking the elongate apiculus of L. cuspidatum, larger fruits with shorter pedicels, and yellowish flowers, typically with a distinctive irregular abaxial russet wash rather than the reddish-purple-brown flowers diagnostic of L. cuspidatum. Additionally, plants of L. roneorum often produce an involucre composed of a few typically broad bracts." (Darrach 2018).

Narrow endemic of acidic substrates of the east slopes of the Cascade Mountains, Washington state. Four populations are known. Threats include climate change and invasive plants.

Known only from Chelan County along the east slope of the Cascade Mountains in central Washington state (Darrach 2018). "Lomatium roneorum is presently known from within an area of approximately 250 square kilometers." (Darrach 2018).

Known from four, well-separated localities (Darrach 2018).

"The most salient long-term threats to the species are likely to be ongoing climate modification and genetic isolation between the small populations with concomitant inefficient seed dispersal" (Marisco & Hellmann 2009 cited by Darrach 2018). "The type locality is infested with non-native weedy
species, including significant amounts of cheatgrass (Bromus tectorum), and the capability of this site to carry fire is of concern. However, most of the plants are in sparsely vegetated locations along the slope." (Darrach 2018).