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NC Native Plant Society:
Plant Details

Silphium compositum

Kidney-leaf Rosinweed, Rosinweed

Scientific Name:

Silphium compositum

Genus:

Silphium

Species Epithet:

compositum

Common Name:

Kidney-leaf Rosinweed, Rosinweed

Plant Type

Herb/Wildflower

Life Cycle

Perennial

Plant Family

Asteraceae (Aster Family)

Native/Alien:

NC Native

Size:

0-1 ft., 1-3 ft., 3-6 ft., 6-12 ft.

Bloom Color(s):

Yellow

Light:

Sun - 6 or more hours of sun per day, Part Shade - 2 to 6 hours of sun per day

Soil Moisture:

Dry

Bloom Time:

May, June, July, August, September

Growing Area:

Mountains, Piedmont, Sandhills, Coastal Plain

Habitat Description:

Silphium compositum var. compositum: sandhills, other xeric forests. Common throughout NC.
Silphium compositum var. venosum: sandhills, other xeric forests. Rare in NC Coastal Plain.

Leaf Arrangement:

Alternate

Leaf Retention:

Deciduous

Leaf Type:

Leaves veined, not needle-like or scale-like

Leaf Form:

Compound

Life Cycle:

Perennial

Wildlife Value:

Has some wildlife value

Landscape Value:

Recommended and Available

Notes:

Weakley (2015) lists 2 varieties in NC: Silphium compositum var. compositum, and Silphium compositum var. venosum.

Flower

image

Flowering stalk

The flowers come atop a leafless stem that can be up to 9 ft tall.

image

Paynter, Wilmington, September, 2013

Basal leaves

The deeply indented, 4 - 12" leaves with usually reddish veins or stems are distinctive.

image

Mid summer, full foliage, before bloom

Eastern Wake County

by Bill Switzer, July 2020

Mid summer, full foliage, before bloom, closeup of one leaf

Eastern Wake County

by Bill Switzer, July 2020

late summer, full foliage, after bloom

Eastern Wake County

by Bill Switzer, September 2020

Normally the blooms on this plant appear on a stem which is 4 to 5 feet high, but this year the stalk was only about 1 foot high.

late summer, full foliage, close-up of one bloom

Eastern Wake County

by Bill Switzer, September 2020

Normally the blooms on this plant appear on a stem which is 4 to 5 feet high, but this year the stalk was only about 1 foot high.

Links:

USDA PLANTS Database Record

Lady Bird Johnson Wildflower Center
Flora of North America



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