been a number of taxonomic revisions the appropriate rank of many taxa, as well as the relationships between them, remains unclear. Selected species Euphrasia × aequalis Euphrasia alpina Euphrasia alsa F.Muell. Euphrasia anglica Pugsley Euphrasia arctica Lange ex Rostrup Euphrasia arctica subsp. arctica (E.borealis auct. non (F.Towns.) Wettsd.) Euphrasia arctica sybsp. borealis (F.Towns) Yeo Euphrasia arguta – believed extinct, rediscovered 2008 Euphrasia azorica Euphrasia brevipila Euphrasia calida Euphrasia cambrica Pugsley Euphrasia campbelliae Pugsley Euphrasia collina R.Br. – purple eyebright Euphrasia collina ssp. muelleri – Mueller's eyebright Euphrasia collina ssp. osbornii – Osborn's eyebright Euphrasia confusa Pugsley Euphrasia coreana W.Becker – Korean eyebright Euphrasia cuneata – North Island eyebright Euphrasia crassiuscula Gand Euphrasia fabula Euphrasia fennica Euphrasia foulaensis F.Towns. ex Wettst Euphrasia fragosa – shy eyebright, Southport eyebright Euphrasia frigida Pugsley – cold-weather eyebright Euphrasia gibbsiae Euphrasia gibbsiae subsp. psilantherea Euphrasia glabrescens Euprasia grandiflora Euphrasia heslop-harrisonii Pugsley Euphrasia hirtella Euphrasia hudsoniana – Hudson's eyebright Euphrasia insignis Wettst Euphrasia kingii Euphrasia lasianthera – hairy eyebright Euphrasia marshallii Pugsley Euphrasia micrantha Rchb. Euphrasia minima Euphrasia nemorosa (Pers.) Wallr. – common eyebright Euphrasia officinalis coll. – doctor's eyebright, or medical eyebright Euphrasia officinalis L – see Euphrasia rostkoviana Euphrasia oakesii – Oakes' eyebright Euphrasia ostenfeldii (Pugsley) Yeo Euphrasia parviflora Euphrasia pseudokerneri Pugsley – chalk eyebright Euphrasia randii – small eyebright Euphrasia rivularis Pugsley Euphrasia rostkoviana Hayne – red eyebright, "figwort" Euphrasia rostkoviana subsp. rostkoviana Euphrasia rostkoviana subsp. montana (Jord.) Wettst. Euphrasia rotundifolia Pugsley Euphrasia ruptura – extinct Euphrasia salisburgensis Funk. Euphrasia scabra R.Br. – rough eyebright Euphrasia scottica Wettst. Euphrasia semipicta – peninsula eyebright Euphrasia striata R.Br. Euphrasia stricta D.Wolff ex J.F.Lehm. Euphrasia subarctica – arctic eyebright Euphrasia suborbicularis – roundleaf eyebright Euphrasia tatrae Euphrasia tetraquetra (Bréb.) . Euphrasia vernalis Euphrasia × vestita Euphrasia vigursii Davey Euphrasia × villosa Euphrasia vinacea – glacier eyebright Euphrasia zelandica Euphrasia sp. 'Bivouac Bay' – Bivouac Bay eyebright Footnotes References Orobanchaceae genera Taxa named by Carl Linnaeus Parasitic plants