How to `ls` only one level deep?

Question

I have lots subdirectories containing data, and I want a short list of which jobs (subdirectories) I have. I'm not happy with the following command.

$ ls H2*
H2a:
energy.dat overlap.dat 
norm.dat zdip.dat ...
(much more)
H2b:
energy.dat overlap.dat
norm.dat zdip.dat ... 
(much more)

This needless clutter defeats the purpose of the wildcard (limiting the output). How can I limit the output to one level deep? I'd like to see the following output

H2a/ H2b/ H2z/

Thanks for your help, Nick