The genus Hymenonema is the only Greek endemic genus comprising two representatives, namely H. graecum and H. laconicum. The former is an endemic species occurring in the phytogeographical regions of the Cyclades and Kriti-Karpathos. Hymenonema graecum probably emerged via allopatric speciation during the Pliocene/Pleistocene boundary. It grows on limestone, granite or schists, up to 450 m a.s.l.

Helichrysum amorginum is a narrow endemic of the Amorgos’ archipelago, first described by Orphanides in the mid-19th century. It grows on calcareous crevices and cliffs. Its inflorescence is a (sub-)globose capitula, bearing distinctive white to whitish or whitish-pink bracts. The Chozoviotissa monastery in Amorgos – one of the most significant Aegean refugia, as it hosts several narrow and rare endemic taxa – is the species’ locus classicus.