Pittosporum sulcatum Sherff , Amer. J. Bot. 28: 26. 1941.
Type information:
Holotype [BISH]. N. Tsuji s.n.. 16 October 1932. O`ahu: Ko`olau Mts., Wai`anaeuka, on side of Waikane-Schofield Trail, in windy and rainy area at top of ridge.
=Pittosporum glabrum

*Verification: R.K. Shannon; Haas, J.E. 1977. Allertonia 1:73-167.

Pittosporum sulcatum Sherff f. tomentellum Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 510. 1941.
Type information:
Holotype [F]. O. Degener 11005. 3 July 1923. O`ahu: Honolulu, above Pauoa Flats, in sunny rain forest.

Note: Only part of this collection is type for this entity. Sherff cited the type as "11005 pro parte." Based on his annotations on the NY sheet, he clearly did not consider it an isotype.

=Pittosporum glabrum
Note: Only part of this collection is type for this entity. Sherff cited the type as "11005 pro parte." Based on his annotations on the NY sheet, he clearly did not consider it an isotype.

*Verification: R.K. Shannon.

Pittosporum sulcatum Sherff var. remyi Sherff, Amer. J. Bot. 28: 28. 1941.
Type information:
Holotype [P]. J. Rémy 572. 1851- 1855. O`ahu: s.l..

Note: Holotype 2 sheets. Pro parte.

=Pittosporum glabrum
Note: Holotype 2 sheets. Pro parte.

*Verification: None.

Pittosporum sulcatum Sherff var. rumicifolium Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 420. 1941.
Type information:
Holotype [F]. F.R. Fosberg 8973. 30 October 1932. O`ahu: Pauoa, peak at head of Pauoa Flats, in wet forest.680m.
=Pittosporum glabrum

*Verification: None.