About Drosera erythrorhiza Lindl.
Drosera erythrorhiza, commonly known as the red ink sundew, is a perennial tuberous carnivorous plant in the genus Drosera. It is endemic to Western Australia and grows in a rosette form. It can be distinguished from other species in Drosera section Erythrorhiza by its many-flowered cymose inflorescences, which can hold up to 50 individual flowers. This species was first formally described by John Lindley in his 1839 publication A sketch of the vegetation of the Swan River Colony. In 1992, N. G. Marchant and Allen Lowrie described three new subspecies of this variable species, which also created the autonym D. erythrorhiza subsp. erythrorhiza. The subspecies were primarily separated based on leaf morphology and distribution. D. erythrorhiza subsp. collina is named for its native hilly habitat, and typically produces more leaves of varying shapes within a single rosette. D. erythrorhiza subsp. erythrorhiza has fewer, wider leaves compared to D. erythrorhiza subsp. magna, which has larger, wider leaves and often produces more leaves overall. D. erythrorhiza subsp. squamosa was originally described as a full species, Drosera squamosa, by George Bentham in 1864. Marchant and Lowrie reclassified this taxon as a subspecies of D. erythrorhiza. Subspecies squamosa differs from subsp. erythrorhiza by the appearance of its red leaf margins, which are caused by dense red tentacles. Earlier in 1906, Ludwig Diels published a new variety, D. erythrorhiza var. imbecilla, in his taxonomic monograph of the Droseraceae family. In 1999, Jindřich Chrtek and Zdeňka Slavíková proposed an alternative competing taxonomy. The authors argued for reclassifying all tuberous Drosera, which make up the entire Drosera subgenus Ergaleium, into Johann Georg Christian Lehmann's 1844 genus Sondera, which had previously been reduced to a synonym of Drosera. In this reclassification, Chrtek and Slavíková elevated Marchant and Lowrie's subspecies to full species rank, establishing Sondera collina, S. erythrorhiza, S. magna, and S. squamosa. This alternative reclassification is not widely followed by the scientific community.
