This form has fine dense foliage and the rich red toothbrush flowers are extremely attractive to birds. It is not common in the nursery trade, but it is well-worth pursuing through specialist nurseries.
Genus: After Charles Francis Greville, 1749-1809, co-founder of the Horticultural Society, London, later the Royal Horticultural Society.
Species: From the Greek, tetra, four; gonia, an angle; lobus, lobe. In reference to the cross-sectional shape of the leaf lobes.