Fireweed, Great Willow-herb: Chamaenerion angustifolium ssp. circumvagum (Synonyms: Chamaenerion angustifolium, Chamaenerion angustifolium var. canescens, Chamerion angustifolium ssp. angustifolium, Chamerion angustifolium ssp. circumvagum, Chamerion angustifolium var. angustifolium, Chamerion angustifolium var. canescens, Chamerion danielsii, Chamerion platyphyllum, Chamerion spicatum, Epilobium angustifolium, Epilobium angustifolium ssp. circumvagum, Epilobium angustifolium ssp. macrophyllum, Epilobium angustifolium var. abbreviatum, Epilobium angustifolium var. canescens, Epilobium angustifolium var. intermedium, Epilobium angustifolium var. macrophyllum, Epilobium angustifolium var. platyphyllum, Epilobium spicatum) - Plants over 50 cm high. Leaves often over 6 cm long. Floral bracts linear and much smaller than the leaves. Inflorescence a raceme of at least 15 flowers. Plants rhizomatous.
Broad-leaf Fireweed, Broadleaf Willowherb, Dwarf Fireweed, River Beauty: Chamaenerion latifolium (Synonyms: Chamerion latifolium, Epilobium latifolium) - Plants less than 50 cm high. Leaves usually less than 6 cm long. Floral bracts lanceolate and leaf-like. Inflorescence a raceme of less than 14 flowers. Plants are non-rhizomatous.