Six novel coumarins have been isolated from the aerial parts of Eriostemon brucei var. cinereus. Five had the same tricyclic nucleus [(+)-2-methyl-5- hydroxy- 2H- benzo-[1,2b:3,4b'] - dipyran-8-onel and varied only in the C-2 substituent, viz. 4- methylpent - 3 - enyl (protobruceol- I), 4 - h ydroxy - 4-methylpent-2(E)-enyl (protobruceol-11), 4- hydroperoxy- 4- methylpent- 2(E)-enyl (protobruceol-I1 hydroperoxide), 3-hydroxy-4-methylpent-4-enyl (protobruceol-III), 3 hydroperoxy - 4- methylpent - 4- enyl (protobruceol- 111 hydroperoxide). A sixth coumarin was characterised as the linear annellated isomer of protobruceol-11, (+)- 2-methyl-2-(4- hydroxy-4-methylpent-2(E)-enyl)-5-hydroxy-2H-benzo- [1,2b:5,4b'] - dipyran- 8 -one (protobruceol-IV).