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The journal of the Western Australian Herbarium

Taxonomic observations on the Stylidium leptocalyx complex (Stylidiaceae)

The name Stylidium leptocalyx Sond. has been misapplied for many years. This trigger plant is now recognised to be of restricted distribution in the wandoo country south-west of York, and is characterised by pink flowers with linear calyx lobes, arranged in a loose, corymb-like raceme. Stylidium stenosepalum E.Pritz. is reinstated to account for the northern sandplain entity previously known as S. leptocalyx. This species differs from S. leptocalyx in possessing white flowers with a longer corolla tube and column. Amended descriptions and floral images are provided for both species, along with the morphologically-allied S. scabridum Lindl.