Mineral Wildflower Festival

Technical Name

• Eriogonum umbellatum

Informal Names

• Sulphur buckwheat

• Sulphur-flower buckwheat

• Umbrella buckwheat

Key Characteristics

• The Color-Shifting Blooms: Features dense, umbrella-like or ball-like clusters (umbels) held aloft on long, naked, often reddish stems. While famous for bursting into a brilliant, sulfur-yellow color in early summer, the flowers characteristically fade to beautiful shades of creamy white, dusty pink, and rusty red-orange as they age and dry out.

• Foliage: The leaves are small, simple, spoon-shaped or oblong, and arranged in tight, crowded rosettes at the base of the plant or along its woody lower stems. They are smooth and green on top but covered in a dense, woolly felt of white hairs underneath to trap moisture.

• Growth Habit: A low-growing, multi-branched perennial subshrub that forms tough, woody-based mats or spreading cushions, typically rising only 4 to 12 inches high but spreading significantly wider.

Notable Significance

• Ecosystem Keystone: It is one of the most ecologically valuable plants in the western mountains. It provides vital nectar and pollen for hundreds of native insect species, serving as a critical host plant for several rare native butterflies, including blues (Plebejus spp.), hairstreaks, and metalmarks.

• Wildlife Forage: The nutrient-rich seed heads, which turn into papery, rust-colored packets in late summer, are an important energy source for chipmunks, ground squirrels, and montane songbirds.

• Erosion Control: Thanks to its tough, woody root system and low-profile matting habit, it excels at binding loose volcanic soils, scree, and gravelly slopes on exposed hillsides.

Locations Found

• Habitat: An absolute specialist for harsh, well-drained, dry, and exposed environments. It thrives in full, intense sun on rocky ridges, volcanic talus slopes, open chaparral, and sandy openings within Ponderosa pine and Jeffrey pine forests.

• Elevation Range: Highly adaptable across a massive altitudinal gradient, it is commonly found anywhere from 3,000 feet up to subalpine ridges at 10,000 feet. It is an incredibly common sight carpeting the rocky roadsides and gravelly flats around Mineral and the lower approaches of Lassen Volcanic National Park.