Πεύκη, Πεύκο, Πεύκος

[slideman]

Can you help me understand the usage of these three forms, please? Mainly, which is the commonest in everyday speech? (Πεύκο?) And presumably one is used mainly for scientific use? (Πεύκος?)
I’m used to meeting double forms (e.g. νησί, νήσος), and to trying to remember which is the “everyday” one. Having three makes it harder…

 

[Perseas]

Mainly, which is the commonest in everyday speech? (Πεύκο?) And presumably one is used mainly for scientific use? (Πεύκος?) (πεύκη)

Πεύκος is mainly vernacular, folk style.

 

[sotos]

ο πεύκος is also colloquial, but less frequent than το πεύκο. There is also το πευκί, understood as small pine tree.