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The journal of the Western Australian Herbarium

Taxonomic notes on the locket trigger plants from Stylidium subgenus Tolypangium section Repentes

Two new trigger plants from south-west Western Australia, Stylidium perula Wege and Stylidium thylax Wege, are described and illustrated. Revised descriptions are provided for the morphologically allied S. sacculatum F.L.Erickson & J.H.Willis and S. pseudosacculatum Lowrie, A.H. Burb. & Kenneally. Features of trichome structure are argued to provide important taxonomic characters at the species level in Stylidium. The morphology and function of the column cunabulum is explored.