Northern Prairie Wildlife Research Center
Southern Wetland Flora
Field Office Guide to Plant Species
Silphium terebinthinaceum Jacq.
- Family: Aster (Asteraceae)
- Flowering: July-October
- Field Marks: This robust, sunflower-like plant is distinguished by its large, ovate, sandpapery
leaves with pointed teeth.
- Habitat: Prairies, glades, edge of woods, old fields.
- Habit: Perennial herb.
- Stems: Upright, smooth or nearly so, up to 10 feet tall.
- Leaves: Nearly all basal, ovate, pointed at the tip, usually heart-shaped at the base, pointed
toothed, usually sandpapery to the touch, up to 1 1/2 feet long, often nearly as wide.
- Flowers: Several in large heads at the tip of the stem, each head up to 3 inches across, subtended
by several broad, green, leathery bracts rounded at the tip.
- Sepals: 0.
- Petals: Some yellow and ray-like, others 5-lobed and tubular.
- Stamens: 5.
- Pistils: Ovary inferior.
- Fruits: Achenes obovate, flattened, winged, notched at the tip, up to 1/2 inch long.
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