I know it as 'Meyersii', but usually hear it called 'Fox Tail Fern'. Heard a lady from Houston call it 'Bottle Brush Fern'. Unlike the other Asparagus densiflorus 'Sprengeri', it does not have the nasty little thorny spines on the stems.
A photo of Meyersii:
For comparison, here's a photo of Sprengeri which does have the spiny stems: