Flower heads are pineapple shaped?

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Multiple Choice

Flower heads are pineapple shaped?

Explanation:
The main idea is recognizing species by the shape of the flower head and its surrounding bracts. Russian knapweed has a distinctive pineapple-like flower head formed by long, protruding involucral bracts that give the head a chunky, spiky silhouette. This trait makes it stand out from the others, whose heads are more rounded or looser in appearance, and from leafy spurge, which isn’t a knapweed at all and has yellow-green inflorescences instead of purple, pineapple-shaped heads. So, the pineapple-shaped heads point to Russian knapweed.

The main idea is recognizing species by the shape of the flower head and its surrounding bracts. Russian knapweed has a distinctive pineapple-like flower head formed by long, protruding involucral bracts that give the head a chunky, spiky silhouette. This trait makes it stand out from the others, whose heads are more rounded or looser in appearance, and from leafy spurge, which isn’t a knapweed at all and has yellow-green inflorescences instead of purple, pineapple-shaped heads. So, the pineapple-shaped heads point to Russian knapweed.

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