Serruria glomerata, the cluster 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, occurring on the Cape Flats and Cape Peninsula. The shrub is erect and grows only 40 cm tall and bears flowers from August to October.

In Afrikaans, it is known as trosspinnekopbos.