Things of Middle-earth
alfirin (Sindarin): 'immortal'
uilos (Sindarin): 'ever-snow-white'
simbelmynë (language of the Rohirrim): 'evermind'
A white flower that blossoms year-round, found in grassy areas of Gondolin and on burial mounds in Rohan; also called alfirin and uilos by Elves; see the alfirin entry for the text of a letter from Tolkien describing the flower:
Upon their western sides the grass was white as with a drifted snow: small flowers sprang there like countless stars amid the turf.
'Look!' said Gandalf. 'How fair are the bright eyes in the grass! Evermind they are called, simbelmynë in this land of Men, for they blossom in all the seasons of the year, and grow where dead men rest. Behold! we are come to the great barrows where the sires of Théoden sleep.'
The Two Towers, LoTR Book 3, Ch 6, The King of the Golden Hall
Helm was brought from the Hornburg and laid in the ninth mound. Ever after the white simbelmynë grew there most thickly, so that the mound seemed to be snow-clad.
The Return of the King, LoTR Appendix A, Annals of the Kings and Rulers: The House of Eorl
Elena Tiriel 24Sep05, 10Dec07