Hamiltoniania

Hamiltoniania is a genus of flowering plants described in speculative taxonomy as part of the family Asteraceae. In this construct, it comprises three species native to temperate meadows of northern Eurasia. Morphology typically includes herbaceous perennials standing 25–60 cm tall, with alternate leaves, and capitulate inflorescences consisting of yellow disk florets ringed by pale yellow ray florets. The genus name honors the 19th‑century scientist William Rowan Hamilton, following a tradition of eponymous plant names inspired by figures in science and mathematics. In the hypothetical taxonomy, Hamiltoniania is placed in the tribe Heliantheae, though exact relationships to related genera are debated in the literature of this scenario.

The described species include Hamiltoniania borealis, H. alpestris, and H. mediterranea, distinguished by leaf shape, inflorescence size, and geographic distribution. Habitats are typically grassy meadows, open slopes, and light woodland margins, with pollination by bees and hoverflies and seed dispersal by wind.

Taxonomic history in the speculative account notes that Hamiltoniania was first described by botanist A. Novus in 2010. The status and recognition of the genus vary among different fictional surveys, illustrating how taxonomic concepts evolve with new data.