Green’s Dictionary of Slang

(Aus.) a chrysanthemum.

1871		Hamilton Spectator (Vic.) 15 Apr. 1/4: It was out of all this that I came to give her — my baby — my little daughter — that odd, unchildlike name, Chrysanthemum [...] Marguerite stoutly refused ever to call her by it [...] and I, for my part, because the flower-name was really too long, shortened it to ‘Chryssie’ for daily use.
1947		Cessnock Eagle (NSW) 14 Oct. 3/4: The Bureau, at its meeting last night, fixed March 20 for the dahlia show, and April 29 for the ‘chryssies’.
1953		Baker Aus. Speaks.
1962		Aus. Women’s Wkly 14 Feb. 12/1: If I listened to more gardeners, so a friend assures me, I’d become accustomed not only to cabs [i.e. cabbages] but to daffs, chryssies, and glads.
1989		Canberra Times (ACT) 9 May 2/3: Chrysanthemums are still the favourites for Mother's Day, from the traditional large white and yellows to the little daisy ‘chryssies’, as they're known in the trade [...] At 2am in the Melbourne flower market, wholesalers are choosing chryssies for Canberra mums.
1995		Canberra Times (ACT) 14 May 26/2: For functions they can be ordered in late winter as 30-day or 40-day chryssies and the grower plots the timing by stopping or budding the plants.