Euphrasia officinalis

Elder blossoms are frequently made into a tea, sometimes with eyebright Euphrasia officinalis) and used as an eyewash for conjunctivitis. Elder flowers are mixed with rosewater and applied to the eyes to improve vision. Elder flower tea is a popular "spring tonic," taken first thing in the morning for several weeks. Elder flowers have also been used as a traditional herb in smoking blends. 

Elder blossoms, eyebright (Euphrasia officinalis) and goldenrod herb make a beneficial infusion to treat hay fever due to its anti-inflammatory properties. 

Harkiss, K.J., and P. Timmins. 1973. Studies in the Scrophulariaceae—Part VIII. Phytochemical investigation of Euphrasia officinalis. Planta Med. 23 182. 

Euphrasia officinalis has been used by modem authors to refer collectively to the genus hence is a collective species and, as such, a nomen ambiguum. Close to 450 species described many into hardly distinguishable microspecies Euphrasia officinalis probably the most useful designation for commercial supplies. 

Source Euphrasia rostkoviana F. Hayne and other Euphrasia spp. (E. officinalis L.) (Family Scrophulariaceae). 

---