Internodal distances

["Jim Seidman" <js4 at seidman_net>]

What factors have noticeable influences on the internodal distances in
stem plants? Light is obviously a factor, but are there other factors
that make a big difference? I'm thinking of things like temperature,
CO2, current, etc.

I'm asking because I've seen great variations in plants like Limnophila
sessiliflora, and would really like to have a better understanding of
what's causing them.

Thanks,
Jim Seidman