How to identify Kidney-leaf rosinweed (Silphium compositum)
Kidney-leaf rosinweed showcases compound basal leaves distinctive for their kidney-shaped outline, contributing to its identification. The leaves are broad and somewhat lobed, emanating from a singular central point at the plant's base. During blooming season, kidney-leaf rosinweed bears yellow composite flowers that are remarkably similar to sunflowers, perched atop sturdy stalks reaching up to 3 feet (90 cm) in height. Each flower head is composed of numerous small florets gathered into a dense cluster, radiating from the center, surrounded by green bracts that form a cup-like protective layer.
Lifespan: Perennial
Plant Type: Herb
Kidney-shaped basal leaves radiate from a central point at the plant's base.
Tall leafless stalks bear yellow composite flowers resembling sunflowers, reaching 3 feet (90 cm).
Distinctive reddish mottled stem, sturdy, and erect, with rough texture and branching upper portions.
Lobed leaves with toothed margins, 4-12 inches (10-30 cm) long, featuring green or red midribs.
Striking yellow flowers with 8 petals radiating from a central disc on elongated stems.
The leaves of kidney-leaf rosinweed are 4 to 12 inches (10 to 30 cm) long with lobed margins that range from ovate to reniform. They feature toothed edges and can be either palmately or pinnately lobed. The midrib, which can be green or red, supports the broad structure of the leaf. These characteristics—size, lobed and toothed margins, and distinctive midrib coloration—are key identifiers.
Kidney-leaf rosinweed produces striking yellow flowers with 8 petals radiating from a central disc. These flowers, which unfurl from May to September, are borne on tall, leafless stalks reaching heights of 4 to 8 feet (1.2 to 2.4 meters). The disc flowers feature undivided styles. The blooms, devoid of notable scent, are a standout feature for identification due to their vivid coloration and elongated, unbranched stems.
The stem of kidney-leaf rosinweed is characterized by a distinct reddish to mottled coloration, providing a striking contrast to surrounding foliage. It is sturdy and erect, typically reaching heights of up to 6 feet (180 cm). The texture of the stem is slightly rough and pubescent, with a tendency to be somewhat branched near the upper portions. The thickness of the stem ranges from 0.5 to 1 inch (1.3 to 2.5 cm), providing ample support for the plant's robust growth.
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Scientific Classification of Kidney-leaf rosinweed
