Helminthostachys

Helminthostachys is a fern genus in the Ophioglossaceae (adder's tongue) family.^[3] It is widespread throughout southeast Asia and Australia.

Helminthostachys
Helminthostachys zeylanica
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Ophioglossales
Family:	Ophioglossaceae
Subfamily:	Helminthostachyoideae C.Presl
Genus:	Helminthostachys Kaulf. 1824
Type species
Helminthostachys dulcis Kaulfuss 1822
Species
†H. halcabadica Fokina 1963 H. zeylanica (L. 1753) Hook. 1824[1]
Synonyms
Botryopteris C. Presl 1825 non Renault 1875 Ophiala Desv. 1827 [2]

Taxonomy

The Smith et al. classification of 2006, based on molecular phylogeny, placed Helminthostachys in Ophioglossaceae.^[4] Subsequent classifications have maintained this placement.^[5][6][7] The PPG I classification assigns it as the sole member of the subfamily Helminthostachyoideae.^[7]