Definition

1. Noun:
   • A plant whose leaves align in a north-south direction: A plant, typically found in North American prairies, whose leaves are oriented to point roughly north and south. This adaptation is thought to help the plant minimize water loss by reducing exposure to the hot midday sun.
   • A common name for specific North American plants: This term is used for certain species, most notably Silphium laciniatum (also called rosinweed), which exhibit this leaf orientation.

Usage Examples

• Noun:
  • The pioneer used the compass plant as a natural guide because its leaves pointed north-south.
  • A field of compass plants is a distinctive sight on the open prairie.

Advanced Usage

• As a botanical indicator: The term is used in ecology and botany to describe a specific adaptive trait (compass orientation) in plants.
  • The compass plant's unique leaf alignment is a classic example of a heliotropic adaptation.

Variants and Related Words

• Compass flower: A less common synonym for compass plant.
• Rosinweed: A common name for , the most famous compass plant.
• Pilotweed: Another regional name for the same plant.

Synonyms

• Polar plant (rare, descriptive synonym).
• Silphium (refers to the genus containing several species known as compass plants).

Related Phrases/Idioms

• To act as a compass plant: Used metaphorically to describe something that provides clear, natural guidance.
  • Her unwavering principles acted as a compass plant for the entire organization.

Noun

1. any of several plants having leaves so arranged on the axis as to indicate the cardinal points of the compass
2. North American annual with red or rose-colored flowers