Serruria williamsii

{{Short description|Species of plant}}

{{Speciesbox

|image = Serruria williamsii 15324227.jpg

|image2 = Serruria williamsii 15324214.jpg

|status = EN

|status_system = IUCN3.1

|status_ref =Rebelo, A.G. & Raimondo, D. 2020. Serruria williamsii. The IUCN Red List of Threatened Species 2020: e.T113239718A185567166. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T113239718A185567166.en. Accessed 29 December 2021.

|taxon = Serruria williamsii

|authority = Rourke

|synonyms =

|range_map =

}}

Serruria williamsii, commonly known as the king spiderhead, is a flower-bearing shrub that belongs to the genus Serruria and forms part of the fynbos. The plant is native to the Western Cape and only occurs in the Riviersonderend Mountains.

In Afrikaans it is known as {{lang|af|koningsspinnekopbos}}.

The leaves of the plant are whorled below the flowerhead stalk, and are curved upwards. They are dissected, stout, and fleshy, approximately {{convert|150-220|mm|abbr=on}} in length and {{convert|30-40|mm|abbr=on}} wide. The flowerhead stalk is {{convert|100-300|mm|abbr=on}} long. The flowerheads are a panicle of lax (i.e. loose) racemes.