Thin-Leaved Sunflower (Helianthus decapetalus)
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- Common Sunflower
Common sunflower has a larger flower with a much bigger eye.
Leaves of cup-plant join around the stem, forming a distinctive 'cup.'
- Large-Flowered Leafcup
Leafcup has a maple-like leaf, while thin-leaved sunflower has a lanceolate leaf.
Thin-leaved sunflower has a narrower leaf.
- Pale-Leaved Sunflower
Leaves of thin-leaved sunflower are sessile (stemless). Pale-leaved sunflower leaves have a short stem.
- Prairie Coneflower
Rays of prairie coneflower are extremely reflexed.
- Small Wood Sunflower
Blossom of the small wood sunflower is smaller, and the leaves are narrower than those of thin-leaved sunflower. Leaves of thin-leaved snflower are stemless.
Sneezeweed has a relatively unusually shaped petal, roughly triangular with a scalloped outer edge.
- Tall Coneflower
Leaf of the thin-leaved sunflower is lanceolate, while that of tall coneflower is lobed.
- Tall Coreopsis
Tall coreopsis has a three-part divided leaf; sunflower leaf is entire.
- Whorled Rosinweed
Whorled rosinweed has leaves in whorls of three, thin-leaved sunflower leaves occur in pairs or singly.
- Woodland Sunflower
These are very difficult to tell apart. Thin-leaved sunflower has a stemless leaf, while the woodland sunflower has short-stemmed leaves.