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Opposite Leaf Structure

Look at the tip- the part farthest away from the stem- of several leaves. Choose big leaves that arenít starting to decay. Observe the angle formed when the two sides of the leaf come together at the tip. Look only within Ĺ cm of the tip, not farther down the leaf. Acute leaves have angles less than 90 degrees, obtuse leaves form angles greater than 90 degrees. Youíll need to approximate, as every leaf may be slightly different. Just because a leaf is long and thin doesnít mean the tip is acute. Use a magnifying glass to take a close look at the tip of thin leaves.
 

Leaf Tips Obtuse

obtuse leaf diagram

leaf tips obtuse (> 90 degrees)

Leaf Tips Acute

acute leaf digram

leaf tips acute (< 90 degrees)

If you don't think your plant is represented above try going back a level and choosing again.


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