Yes, Notrab and Sunray, you're both right. But I'm not convinced that you can call this thing just 'Broom'. An old Collins Pocket Guide gives Broom as genera Sarothamnus and Cytisus. The 38A genus is described as Petty Whin, Dyer's Greenweed or Hairy Greenweed. Makins describes Petty Whin as 'Needle Furze.'
The replacements are pretty straightforward, though the anagramming of the extra letters gives surprising results in a couple of cases. And one of the replacements is counter-intuitive in that it sinks a cruiser...