Solved Rhizome in woodland garden

I was visiting a garden yesterday and in a shady woodland area was a big patch of something that looked like a flowering bulb. It had no flowers at the moment and just some wispy fronds that looked like grass. It was also actually growing from rhizomes and there was a big pile which the gardens had weeded out to stop it spreading. It took a couple home. What is it? Is it worth planting?

I have a photo and have just resized it. I still can't get it to insert here and I just can't REMEMBER the whole palaver you have to go through to get an image up on this site. I have the whole trouble EVERY SINGLE TiME. So here is an external link:
Imgur

 

@Berberis Artista can't make out much on the picture. A clear picture of the rhizomes would help.
If the gardeners there are weeding it out to prevent spread I would think twice about letting it loose in my garden.
It's not woodrush is it?

 

I think they are just being a bit fussy about the shape of their bed. I am desperate for easy perennials for my garden. It does look like Woodrush. Shame those flowers are not a bit bigger.

This is the what I took:
Imgur

 

Hmm! Must need new glasses.
Searched very carefully...cannot see any flowers...or seed heads.

 

@Silver surfer no flowers in photos possibly referring to flowers found in pictures here Luzula sylvatica | great wood-rush/RHS Gardening

 

Thanks ..NigelJ
I see referring to those found in the link...not in the pics posted

 

Berberis Artista
If you want an easy evergreen may I suggest Pachysandra terminalis.
Superb ground cover. No weeds can compete.
Small white flowers
Easy to remove if it gets too big.

pachysandra terminalis - Google Search