| involucre |
A ring of bracts or small leaves at the base of a flower
출처: www.provet.co.uk/lorgue/5ce845b.htm
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| involute |
This means curved towards the midline of the petal, along its length. Sufficient involution will create a tubular petal which may be referred to as Fully Involute or Quilled. The Ball and Pompom Dahlias must have petals that are actually quilled for at least half their length. The Decorative category has many permissible characteristics and many Formal and Informal Decoratives show a lot of Involution, but not fully involute, especially not near the tips. ...
출처: www.members.shaw.ca/hydahlia/bloom.term.html
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| involute |
If C is a curve and C' is its evolute, then C is called an involute of C'. Any parallel curve to C is also an involute of C'. Hence a curve has a unique evolute but infinitely many involutes. Alternatively an involute can be thought of as any curve orthogonal to all the tangents to a given curve.
출처: www-groups.dcs.st-and.ac.uk/~history/Curves/Defini...
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