Githopsis diffusa subsp. candida Githopsis diffusa subsp. candida (Ewan) Morin, Syst. Bot. 8: 464. 1983≡Githopsis specularioides subsp. candida Ewan, Rhodora 41: 308. 1939≡Githopsis diffusa var. candida (Ewan) Morin, Syst. Bot. 8: 464. 1983