|Geranium molle, Raroa Road, Highbury, Wellington|
|Geranium molle flowers, Highbury.|
Landcare Research, records 7 native and 14 naturalised or casual species, to which the NZ Plant Conservation Network database adds G. incanum (naturalised). Webb et al. (1988) recorded 7 native and 8 naturalised. The increase partly results from new taxonomic revisions that have promoted some varieties to species rank, new introductions, and perhaps a widening of the criteria for what is considered naturalised and casual.
Cranesbills have a link with famous British scientist John Dalton. Dalton was colourblind, suffering a condition now sometimes known as Daltonism, and reported that the colour of cranesbill flowers was sky blue. When others disagreed, he realised he wasn't seeing colour as they did. He left his eyes to science, and genetic analysis has shown he lacked a functional copy one of the three opsin genes that are needed for full human colour vision.
Webb, C.J.; Sykes, W.R.; Garnock-Jones, P.J. 1988. Flora of New Zealand Vol. 4. DSIR, Christchurch.