Category: R
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Rufescent
Becoming reddish.
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Rudimentary
Small and non-functional, arrested at an early stage of development. Imperfectly developed. Existing in a small form, or not developed fully. Underdeveloped or only partially formed, often referred to as vestigial or abortive.
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Ruderal
From the Latin rudus, meaning ‘old rubbish’, growing in waste places. A habitat which is dry, generally under-vegetated and often waste ground, usually colonised by pioneering or ‘weedy’ species of plants.
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Rounded
(Usually of the base or apex of a plane shape) smoothly curved, without abrupt angles. The apex gently curved.
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Rotundate
(Plane shape) between oblong and rounded in outline.
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Rotund
2-dimensional shape between oblong and rounded in outline, nearly round. Having a roundish outline.
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Rotate
Wheel-shaped, usually of a corolla with a very short tube and spreading lobes. Having the parts flat and spreading or radiating like the spokes of a wheel. To move in a circle, or make something move in a circle.
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Rosulate
With the leaves in a circle at the base of the stem; With a leaf-rosette. Forming a rosette.
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Rostrum
Beak-like extension. A projecting part of a bone or structure shaped like a beak. Structure that looks like a beak (e.g., sphenoidal rostrum, ridge on the lower part of the sphenoid bone of the skull). A beaklike projection, such as that on the sphenoid bone.
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Rostrate
Bearing a beak.