Xanthosia leiophylla is a tufted herb or weak subshrub in the family Apiaceae and is endemic to south-eastern continental Australia.

Xanthosia leiophylla is a tufted herb or weak subshrub that typically grows to a height of up to 15 cm (5.9 in) and has low-lying or ascending branches.

Flowering occurs in spring and summer and the fuit is about 2 mm (0.079 in) long and the schizocarps are finely ribbed.

[2] Xanthosia leiophylla was first formally described in 1859 by Friedrich Wilhelm Klatt from an unpublished description by Ferdinand von Mueller.

Klatt's description was published in Linnaea : Ein Journal für die Botanik in ihrem ganzen Umfange, oder Beiträge zur Pflanzenkunde.