H altissima

These roots are long and fibrous and almost string like.

H aurantiaca

These roots are somewhat bulbous and are like fulva,

H citrina

The roots are long and cylindrical

H coreana

H dumortierii

H flava

I have a flava from Olallie and one from Apps. The one above is Olallie. The roots are fibrous and not bulbous. The Apps root seems to be bulbous.

H fulva

This is the classic fulva bulbous root.

H hakuunensis

H minor

These are long almost grass like roots.

H multiflora

This is a bulbous root. The multiflora is a slow grower and does not compete well.

H middendorfii

H thunbergerii