n = 5 (4+m) from Newton (1973) redrawn as Fig. 4.
Touw (1971) placed this species and H. kerrii, both formerly Sciacladus, in section Sciacladus of Hypnodendron, rejecting their status as a separate genus. The subspecies menziesii has the more southerly distribution (Norfolk Island and New Zealand and ?Australia) while the subspecies splendidum is more northerly in its occurrence (New Caledonia and the Solomon Islands). The chromosome number n = 5, based on mitotic counts of laboratory grown plants from New Zealand, was made by Newton (1973) and is the only record so far for this species. As I have not yet studied H. menziesii the chromosomes have been redrawn here as a karyotype (Fig. 4) for comparison with other species. The complement of five chromosomes consists of one large metacentric or submetacentric, two intermediate in size, also submetacentric, one smaller acrocentric and the smallest, interpreted as a microchromosome by Newton (1973), with a median to sub-median centromere.