I new it had "physa" in the name, but not in the genus. It's an annual that I grew 10+ years ago. They still pop up, and one came up this season that I let grow, and I was just trying to remember the name the other day. How fortuitous that you posted this query, Myriam! Thanks!
Incidentally, it produces enough seed to sow an acre, so if anyone wants any......
And look at that Silybum marianum..... it's 48 inches across!!! (from leaf tip to leaf tip)
