Leionema sympetalum, commonly known as Rylstone bell,[2] is a shrub with greenish-yellow tubular flowers in small terminal clusters at the end of smooth, angular branches.

The inflorescence is cluster of 1-3 flowers often pendulous at the end of branches, each on a slender, reddish stalk about 7 mm (0.28 in) long.

[2][3] Rylstone bell was first formally described by Paul G. Wilson in 1970 and gave it the name Phebalium sympetalum, the description was published in the journal Nuytsia.

[6][7] This species is confined to the ranges near Rylstone in New South Wales growing in dry sclerophyll forests on rocky outcrops.

[3] This species is classified as "vulnerable" by the Government of New South Wales Environment Protection and Biodiversity Conservation Act 1999.