The white flowers are borne in umbels, 2–3 cm (0.79–1.18 in) in diameter, 4-6 rays and linear-shaped bracteoles up to 1.5 mm (0.059 in) long.

[2][3] In 1912 the species was named Trachymene clelandii by Joseph Maiden and Daniel Ludwig Ernst Betche.

[4][5] In 1962 Lawrence Alexander Sidney Johnson changed the name to Platysace clelandii and the description was published in Contributions from the New South Wales National Herbarium.

[6] The specific epithet (clelandii) honours John Burton Cleland collector of the type specimen.

[7] Platysace clelandii grows in open, dry forests and hillsides amongst sandstone rocks from Glen Davis to Berowra.