Summary
A taxonomic study in Phytotaxa recognises five species in the giant waterlily genus Victoria, including V. colombiana in Colombia’s upper Orinoco and V. mattogrossensis in the Pantanal. The researchers compared plant morphology and mapped populations against South American river drainage patterns.
A taxonomic study published in Phytotaxa recognises five accepted species of giant waterlily in the genus Victoria, adding Victoria colombiana from Colombia’s upper Orinoco drainage and V. mattogrossensis from the Pantanal region. The researchers based their assessment on comparisons of plant morphology and the distribution of populations across South America’s river basins.
The paper’s finding is a revision of how the genus is classified, not a claim that both plants were newly found in the field. The authors say that two additional species warrant recognition. The V. colombiana population was first noticed in an Instagram post, according to the study abstract.
How the study distinguishes the species
The researchers mapped Victoria populations onto a map of South American river drainages and compared their morphology—the observable form and structure of the plants. The study reports that the five accepted species differ in both morphology and distribution. It also provides an identification key, alongside a nomenclatural overview covering the names used for the species and their typification.
The two additions come from different regions: V. colombiana is associated with the upper Orinoco drainage in Colombia, while V. mattogrossensis is recognised in the Pantanal. Recording these as separate species makes the genus’s documented diversity and geographic ranges more precise, which helps researchers describe how biodiversity is distributed across the continent.
River basins as barriers and routes
The authors propose that rivers and floodwaters are the main means by which Victoria seeds disperse. Their reasoning is that known animal dispersers are lacking and the seeds are sensitive to drying out. In this account, waterways can carry seeds while also separating populations in different drainage basins.
The study suggests that isolation of river basins since the Pliocene, together with changes in river courses over time, may have contributed to diversification in the genus. The authors describe this evolutionary explanation as putative: it is a proposed account of how the species’ distributions and differences arose, rather than a directly observed history.