Yosemite and Tioga Pass Area

Fireweed (Chamerion angustifolium) has leaves that are unique because the leaf veins are circular and do not terminate on the edges of the leaf, but form circular loops and join together inside the outer leaf margins. Fireweed seeds remain viable in the soil seed bank for many years. The seeds germinate when a new fire or other disturbance occurs that opens up the ground to sunlight again.