Silphium

Silphium brachiatum

Silphium radula var. gracile

Silphium radula var. radula

Reverchon's rosinweed

Silphium compositum var. compositum

Silphium compositum var. venosum

Silphium albiflorum

Silphium laciniatum

Polarplant

Silphium asteriscus

Starry rosinweed

Silphium perfoliatum

Indian-gum

Silphium wasiotense

Silphium integrifolium var. gattingeri

Silphium chickamaugense

Silphium mohrii

Mohr's rosinweed

Silphium integrifolium

Whole-leaf rosinweed

Silphium perplexum

Silphium asteriscus subsp. asteriscus

Silphium integrifolium var. integrifolium

Silphium integrifolium var. laeve

Silphium asteriscus var. latifolium

Silphium asteriscus var. asteriscus