Kendall County (IL) Forest Preserve District
Rosinweed
(Wholeleaf Rosinweed)
Silphium integrifolium
[C-value
5]
Aster family (Asteraceae)
Blooms June -
September
The native Rosinweed is common in our area. It prefers full sun and medium to dry conditions. Habitats include medium to dry black soil prairies, gravel prairies, hill prairies, openings in rocky upland forests, and prairie remnants along railroads. This perennial is 3-5' tall, unbranched with a stout stem covered with stiff short hairs. The opposite leaves are up to 5" long and 2½" wide with stiff small hairs providing a sandpapery texture. The leaves don't have petioles and usually clasp the stem. A panicle of composite yellow flowers appear at the top of the plant, resembling small sunflowers. Each flower is about 2–3" across with 12-25 ray florets surrounding numerous disk florets.
Rosinweed at Richard Young Forest Preserve August 20, 2013
Rosinweed at Millbrook South Forest Preserve July 19, 2012
Rosinweed foliage at Harris Forest Preserve August 20, 2013
Rosinweed early flower buds at Rose Hill Subdivision July 6, 2013
Rosinweed (and Big Blue Stem) at Richard Young Forest Preserve August 20, 2013
Rosinweed fall seed heads at Blackberry Trail Forest Preserve November 5, 2014
Rosinweed gets its name from the sticky sap that Native Americans and Pioneers used as chewing gum. Reminder: see our Do Not Disturb Notice.
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