Sesuoium portulacastrum var. griseum O. Deg. & Fosberg, Occas. Pap. Bernice P. Bishop Mus. 21 (3): 45–47. 1952.

Trianthema griseum [grisea] (O. Deg. & Fosberg) O. Deg. & I. Deg., Flora Hawaiiensis [Degener], book II: Fam. 116. 1960.

— TYPE: KIRIBATI. Phoenix Islands, Kanton Island, O. Degener 21451 (holotype: BM, isotype: B!).