Who is shepherdess Amaryllis in Virgil's Eclogues?

Amaryllis was a beatiful sheperdess who fell in love with alteo who had strength of hercules and the beauty of apollo but he didnt like women he only wanted a flower so amaryllis showed up at his house 30 nites in a row and stabbed her heart because she loved him then on the 30th nite as he opened the door a beatiful unknown flower came out from her blood