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arctangent > Prairie dock (Silphium terebinthinaceum). Easily the tallest composite that blooms on the tall grass prairie, with stalks up to 10 ft tall. In winter the large basal leaves take on a fascinating appearance, including a rich dark color and a polka-dot pattern. The stalk seen here towers over even the tallest of the tall grasses. For a good discussion of this plant, see for example, http://www.illinoiswildflowers.info/prairie/plantx/pr_dockx.htm
arctangent > Typical "buttons" of prairie dock seedheads forming high in the air. Prairie dock is related to Compass Plant and Cup Plant, but has distinctive unmistakable leaves. The flowers themselves might easily be confused.
arctangent > Prairie dock closeup. Not all the blooms are 10 feet in the air, fortunately for the poor photographer!
arctangent > Hello, sunshine. A bloom of prairie dock just beginning to develop the sexual organs of the flower center.
arctangent > Prairie dock turned to face the sun.
arctangent > Prairie dock bloom with backlighting.
arctangent > Closeup of the ragwort-like composite seen in its entirety in a companion photo. Another possible identification is Stiff Goldenrod, whose leaves more closely resemble this plant than do the leaves of ragworts.
arctangent > Unidentified composite in prairie setting. This view shows entire plants. See closeups for bloom details. The bloom habit and general flower shape resemble ragworts, but the leaves don't match any of the ragworts in my field guides. Stalks were 3-5 ft tall. Another possibility is Stiff goldenrod. See for example, http://www.illinoiswildflowers.info/prairie/plantx/stf_goldenrodx.htm . August 24, 2009 NW Ohio.
arctangent > Tall grass prairie composite. Resembles a narrow-leaved sunflower (Helianthus angustifolius).
Prairie dock (Silphium terebinthinaceum). Easily the tallest composite that blooms on the tall grass prairie, with stalks up to 10 ft tall.

In winter the large basal leaves take on a fascinating appearance, including a rich dark color and a polka-dot pattern. The stalk seen here towers over even the tallest of the tall grasses.

For a good discussion of this plant, see for example,http://www.illinoiswildflowers.info/prairie/plantx/pr_dockx.htm
arctangent > Prairie dock (Silphium terebinthinaceum). Easily the tallest composite that blooms on the tall grass prairie, with stalks up to 10 ft tall. In winter the large basal leaves take on a fascinating appearance, including a rich dark color and a polka-dot pattern. The stalk seen here towers over even the tallest of the tall grasses. For a good discussion of this plant, see for example, http://www.illinoiswildflowers.info/prairie/plantx/pr_dockx.htm
Prairie dock (Silphium terebinthinaceum). Easily the tallest composite that blooms on the tall grass prairie, with stalks up to 10 ft tall.

In winter the large basal leaves take on a fascinating appearance, including a rich dark color and a polka-dot pattern. The stalk seen here towers over even the tallest of the tall grasses.

For a good discussion of this plant, see for example,http://www.illinoiswildflowers.info/prairie/plantx/pr_dockx.htm
See photo in gallery
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