A genome assembly of Douglas' meadowfoam, Limnanthes douglasii R. BR.

The meadowfoams are annual plants in the genus Limnanthes, a group characterized by striking displays of bloom in damp, grassy habitats. The genus is endemic to western North America and, of the seven species and nineteen subspecies currently described, several are listed as rare or endangered due to extensive habitat loss. Species in the genus exhibit diverse reproductive systems and associations with specialist pollinators, both of which influence genetic diversity and gene flow. However, genomic studies across the genus remain limited, particularly for threatened taxa, hindering effective conservation strategies. Morphological variation within Limnanthes subspecies is also poorly understood, and phylogenetic relationships among several taxa remain unresolved. As part of the California Conservation Genomics Project, a reference genome for Limnanthes douglasii R. BR. has been assembled to help address these gaps. This genomic resource will support research into the evolutionary relationships, ecological interactions, and population structure of Limnanthes. Additionally, given that Limnanthes seeds yield a unique, high-stability oil, the genome has agricultural relevance, particularly for enhancing oil production and desirable reproductive traits in cultivated taxa.