This section is from the book "How To Know The Wild Flowers", by Frances Theodora (William Starr Dana). Also available from Amazon: How To Know The Wild Flowers.
Height. - Two to four feet. Leaves. - The lower cleft or toothed, the uppermost oblong and undivided. Flower-heads. - Nodding, composed of white or greenish strap-shaped flowers surrounded by a purplish involucre.
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