Willow-specialist
Guides
Colias scudderii
Scudder's Sulphur, willow sulphur
Colias scudderii, commonly known as Scudder's Sulphur or the willow sulphur, is a butterfly in the family Pieridae. It inhabits mountain meadows and willow bogs across a broad elevational range from Alaska through the Rocky Mountains to northern New Mexico. The species has a wingspan of 38–51 mm and is active during summer months. Larvae feed exclusively on willow species (Salix), with later instars overwintering.
Stigmella fuscotibiella
Stigmella fuscotibiella is a pygmy moth in the family Nepticulidae, characterized by its diminutive size and leaf-mining larval habit. The species is distributed across eastern and central North America, with records from the United States and Canada. Its larvae feed on willow species (Salix), creating characteristic mines in host plant leaves.