"May May" (Hayward 76) is supposed to have a very long bloom season. 3 1/2" Flowers, 30" tall, diploid. Fragrant, ivory with green at the throat, like Italian ice. Fragrant, nocturnal with semi-evergreen foliage. Small blooms on tall scapes. In my garden it has bloomed from early to mid June until mid July, then again in late summer.