I don't know. Maybe a candelilla that hasn't been growing under full light conditions causing it to corkscrew? It just looks like what I used to know as 'pencil plant', which wasn't quite the same as the Euphorbia tirucalli 'Firesticks' that I'm growing. It's been a while since I've actually seen one growing anywhere, but they used to common in the Austin, TX nurseries back in the 70s. They tend to stay green and not get the coloring of 'Firesticks' but otherwise are similar. I think the pencil plants may have longer segments, but that may be a bad memory at work. These last photos don't look like Juncus to me. But the candelilla wouldn't normally corkscrew, either. Could it be a type of etiolation?