 Duckweed,
a small floating flowering plant, is highly recommended
for fish. It's not only considered extremely healthy for
many types of fish in their diet but the roots attract other
nutritious microscopic foods for smaller fish and fry. These
plants grow floating in still or slow-moving fresh water
around the globe, except in the coldest regions. The growth
of these high-protein plants can be extremely rapid, so
much so that even if a few of these plants remain after
a water change they will quickly repopulate the surface.
I've read that environmental scientists are using duckweeds
to remove unwanted substances from water. All in all a very
good addition for a bowl.
I will rarely have just one type of plant with a betta.
Here we see my sons betta building it's bubble nest among
three types of plants, salvinia, duckweed and below anaracharis.
Duckweed (for me) is almost like an accessory for the other
plants I use.
 similar
to salvinia and frogbit but much smaller. These small pads
hang a single root into the water. to gather nutrients.
Almost inseparable to it's cousin salvinia the two are rarely
seen apart.
 A
close up of the pads. One thing you'll soon  realize
after keeping duckweed is it is extremely prolific. So much
so it's usually fine to loose most of your pads during a
water change and they will quicly come back to cover the
surface.
 A
closeup shot of several pads and it's single nutrient gathering
root.
 The
top leaf here is just staring to divide. We can see top
and bottom leafs just starting to grow. When they get big
enough (a matter of days) the plant will divide.
Possible sources for duckweed:
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