IUCN threat status:

Not evaluated

Comprehensive Description

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Description

This native perennial plant is up to 2½' tall, branching frequently from the upper axils of the leaves, and having a shrubby appearance. The base of the plant is occasionally semi-woody, but the upper stems are herbaceous and green. The entire plant is devoid of hairs. The opposite leaves are up to 3" long and ¾" across. The pairs of leaves rotate by 90° as they ascend the stems. They are oblong or lanceolate with blunt tips, and are sessile against the stems. The margins are smooth, while the underside of each leaf is light green and devoid of black dots.

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

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