purple rock brake
- noun
- US
:
helecho púrpura
- The purple rock brake grows best in rocky crevices along mountain cliffs.
Examples
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We spotted a patch of purple rock brake thriving on the old stone wall.
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Botanists admire the glossy stems of the purple rock brake when studying native ferns.
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The purple rock brake thrives in rocky environments.
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Look at that purple rock brake growing on the wall!
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The purple rock brake is often found clinging to the edge of steep cliffs.
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In spring, the purple rock brake displays lush green fronds against the rocks.
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Visitors often notice the striking purple rock brake growing on the ancient stone walls.
Synonyms
A small fern that grows on cliffs and walls with dark shiny stems
A small fern that grows on cliffs in California with purple-brown stems
Surface Forms
Morphology
The phrase is fully compositional: 'purple' names the color, 'rock' specifies the substrate/habitat, and 'brake' (a growth of ferns) names the plant type, so together they denote a fern on rocks with purple characteristics. Although botanical and somewhat specialized, the adjective+noun+noun composition follows normal English patterns and would be inferable by a B1 learner who knows the constituent meanings.
Etymology
Purple rock brake paints a simple picture: purple for its dark, shiny leaf stalks, rock because it grows on cliffs and stone walls, and brake is an old word for a 'fern'. That's why the name refers to a small, creeping fern with glossy stems that lives in rocky crevices.
