Whorled Rosinweed (Silphium trifoliatum)
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Leaves of cup-plant join around the stem, forming a distinctive 'cup.'
- Large-Flowered Leafcup
Leafcup has a maple-like leaf. Rosinweed has lanceolate leaves in whorls of three.
- Pale-Leaved Sunflower
Leaved of whorled rosinweed grow in whorls of three.
- Prairie Coneflower
Rays of prairie coneflower are extremely reflexed.
Sneezeweed has a relatively unusually shaped petal, roughly triangular with a scalloped outer edge. Leaves of whorled rosinweed occur in a whorl of three, while leaves of sneezeweed grow singly.
- Tall Coneflower
Tall coneflower has a higher, more spherical eye. Rosinweed leaves occur in whorls of three.
- Tall Coreopsis
Rosinweed leaves occur in whorls of three; coreopsis leaves are divided and occur in pairs.
- Thin-Leaved Sunflower
Whorled rosinweed has leaves in whorls of three, thin-leaved sunflower leaves occur in pairs or singly.
- Woodland Sunflower
Whorled rosinweed leaves occur in whorls of three, while woodland sunflower leaves occur in pairs.