Helianthus silphioides Nutt.

Rosinweed Sunflower

Helianthus_silphioides_plant.jpg
STATS

Native
CC = 7
CW = 5
MOC = 13

© DETenaglia

Family - Asteraceae/Heliantheae

Stems - No info. yet.

Helianthus_silphioides_stem.jpg

© DETenaglia

Leaves - No info. yet.

Helianthus_silphioides_leaves2.jpg Adaxial surface.

© DETenaglia

Helianthus_silphioides_leaves1.jpg Abaxial surface.

© DETenaglia

Inflorescence - No info. yet.

Involucre - No info. yet.

Helianthus_silphioides_involucre.jpg Involucre.

© DETenaglia

Ray flowers - No info. yet.

Helianthus_silphioides_flowers.jpg

© DETenaglia

Disk flowers - No info. yet.

Helianthus_silphioides_disk.jpg Disk close-up.

© DETenaglia

Flowering - August - October.

Habitat - Low sandy soil near streams, borders of woods, dry upland woods, thickets, roadsides. Typically on acid soils.

Origin - Native to U.S.

Other info. - This showy species can be found in the southeastern corner of Missouri. This is a very showy plant worthy of cultivation. It grows to 3m tall and produces many flowers.
The plant is easy to ID in the field because of its rounded involucre bracts and leaves, which are mostly in the basal half of the plant.
The species epithet, "silphioides" means "looks like Silphium" which is another genus in the family Asteraceae. Plants in the genus Silphium have rounded involucre bracts and undivided styles on their disk flowers.

Photographs taken off Hwy C., Carter County, MO., 8-31-03.