Awns
Awns (/'ɔːnz/)
Awns (/'ɔːnz/) are long, bristle-like structures that extend from the lemma of the floret of a grass. They are a common feature in many grass species and can serve various functions, including seed dispersal and protection from herbivores.
Etymology
The term "awn" is derived from the Old English "egenu," meaning "eye," and the Middle English "awne," meaning "beard." This is likely due to the awn's resemblance to a beard or eyelash.
Function
Awns serve several functions in grass species. They can aid in seed dispersal by catching onto the fur of animals or being carried by the wind. Some awns are hygroscopic, meaning they respond to changes in humidity. This can cause the awn to twist and turn, effectively drilling the seed into the ground. Awns can also deter herbivores from eating the seeds by making them less palatable or more difficult to consume.
Related Terms
- Lemma: The outer bract that encloses the flower in grasses. Awns extend from the lemma.
- Floret: A small flower, typically part of a larger cluster. In grasses, the floret is enclosed by the lemma and palea.
- Seed dispersal: The movement or transport of seeds away from the parent plant. Awns can aid in seed dispersal by catching onto animals or being carried by the wind.
- Hygroscopic: The ability of a substance to attract and hold water molecules from the surrounding environment. Some awns are hygroscopic, which can aid in seed dispersal.
External links
- Medical encyclopedia article on Awns
- Wikipedia's article - Awns
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