Sandwith, ?Bull. Misc. Inform. Kew 1926: 244.?, 1926.

Sandwith, ?Bull. Misc. Inform. Kew 1931: 488.?, 1931.

Sandwith, ?Kew Bull. 1938: 370. 1938?, 1938.

Sandwith, ?Hookers Icon. Pl. 34: t. 3325. 1936 [1939 publ. Dec 1936]?, 1936.