From the CO2Science Archive: The Knobby Club sounds like a hangout for snooty English gentlemen, straight out of a PG Wodehouse farce, and the Knobby Club Rush would presumably be either its initiation rite or a hasty eviction from its premises. And its Latin name Ficinia Nodosa L. certainly sounds like the sort of scheming English lady Wodehouse is always sending after Bertie Wooster. Excuse me sir, but there’s a Miss Finicia Nodosa at the door for you. Jeeves, I am not at home. Say I’ve emigrated or died or something. But in fact Knobby Club Rush is not English but native to Australia, New Zealand and South Africa, and it is not a lounge for comic fops but a tall perennial able to grow in sandy soil and gardens alike, making it popular with landscapers. And it loves CO2. In 2020 a pair of experiments showed that an extra 300 ppm CO2 caused it to grow an average of 275% bigger. So if you see Finicia Nodosa coming towards you on an Australian beach, watch out because she may be bigger than you expect.