Silphium

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - showing a single bloom at full open with detail of disk flowers blooming.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - several flowers after blooming as seeds mature; one is beginning to show seed dispersal structures.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - showing opposite leaf pairs that rotate 90 degrees as each pair goes up the stalk, giving this species its stiff, formal look.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - showing two flower heads with many flower buds and three full open blooms.

field image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - a stand at full bloom showing foliage that is unique and distinct.

field image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - a large stand not yet blooming.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - a flower bud at open, prior to the emergence of either ray or disk flowers.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - several flower heads at full bloom.

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - showing stalk as it begins to divide to create the flower head

close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - a single bloom showing ray flowers and disk flowers; the central disk structure and color are unique among prairie flowers.This species is featured in the book Abundant Splendor: Wildflowers of the Tall Grass Prairie, which is now available for purchase. Contact frank@black-sweater-art.com for more information.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single stalk at full bloom showing a typical flower head with about two dozen flowers and buds.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a trio of basal leaves almost at full open.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a thick stand at full bloom; average height of flowering heads is about 7-8 feet (213-244 cm).

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - multiple stalks with multiple flower buds.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single full bloom showing multiple ray and disk flowers as well as some detail of stigmas and anthers.This species is featured in the book Abundant Splendor: Wildflowers of the Tall Grass Prairie, which is now available for purchase. Contact frank@black-sweater-art.com for more information.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single flower stalk beginning to show flower head with about 6 flower buds.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a thick stand of basal leaves, indicating many individual specimen, at full open; these leaves at about 18 inches (46 cm) tall by 9-12 inches (23-30 cm) wide are unique and distinct.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single flower head showing over 30 flowers and buds; blooms occur over a period of about six weeks.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single basal leaf at emergence; leaf just beginning to open.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - several flower stalks dying back in mid-fall.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single specimen at bloom time; the yellow field in the background is a thick stand at bloom time.

field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - another thick stand at full bloom showing flowers after a controlled burn the previous fall.

close up image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single specimen showing basal leaves and two flower stalks.

Hof, Bavaria, Germany