What does の mean in 形のない花?


I came across a 東方 remix called 形のない花, which translates (apparently) to
"Shapeless Flower".

Now, I see the words 形、ない、花 for, of course, "Shape", "Not", and "Flower"
respectively. However, I'm at a total loss when it comes to what exactly the
syntax is supposed to be doing.

Is ない a noun or adjective? Is の a possessive or a が in a relative clause? I'm
at a loss for this stuff and am wanting some help; as I simply don't know
where to start, even if I can understand the meaning.




ない is adjective

の is が

形(subject) が(verb) ない(adjective) 花(noun)

