Strange umbellifer

Strange umbellifer

Observation - Strange umbellifer - UK and Ireland. Description: Single plant. Rough, channelled stem. Sheathing leaf bases. Leaves remind me of Alexanders. Proliferation of bracts below umbel. No smell. Can't get it to key out, is it an aberration?

Single plant. Rough, channelled stem. Sheathing leaf bases. Leaves remind me of Alexanders. Proliferation of bracts below umbel. No smell.
Can't get it to key out, is it an aberration?