Pittosporum insigne Hillebr. , Fl. Hawaiian Isl. 25. 1888.
Type information:
Holotype [B]. W. Hillebrand s.n.. August 1870. Maui: West Maui, Mt. Eeka [`Eke].4000 to 6000ft. Isotype(s) [GH [photo BISH!, F?], K].

Note: Haas, Allertonia 1: 122. 1977, notes presumed isotypes at GH, K

=Pittosporum glabrum
Note: Haas, Allertonia 1: 122. 1977, notes presumed isotypes at GH, K

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

Pittosporum insigne Hillebr. f. pertinax O. Deg. & Sherff, in Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 414. 1941.
Type information:
Holotype [F]. O. Degener 10959. 15 April 1928. Moloka`i: ravine just S of Maunahui, in forest. Isotype(s) [MO!, NY [2, mfc!], US].
=Pittosporum argentifolium

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

Pittosporum insigne Hillebr. var. fosbergii Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 413. 1941.
Type information:
Holotype [BISH]. H. St. John , R.J. Baker and J.W. Coulter, F.R. Fosberg, & T. G. Yuncker 12604. 25 December 1932. Moloka`i: Kawela, Waikolu Valley, ridge between Hanalilolilo and Pepe`opae, on steep pali in rain forest. Isotype(s) [F, US].
=Pittosporum glabrum

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

Pittosporum insigne Hillebr. var. hillebrandii (H. Lév.) Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 415. 1941. Flora of the Hawaiian Islands --Basionym
Type Information
Pittosporum hillebrandii H. Lév. , Repert. Spec. Nov. Regni Veg. 10: 121 1911.
Moloka`i: Puko`o. May 1910. U. Faurie 17.
Holotype [P]. Isotype(s) [BISH! [photo F?]].
=Pittosporum glabrum

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

Pittosporum insigne Hillebr. var. lydgatei Sherff, Amer. J. Bot. 28: 19. 1941.
Type information:
Holotype [B]. J. M. Lydgate s.n.. s.d.. Maui: East Maui, Hamakua. Isotype(s) [BISH! [3]].

Note: Sherff based his name on Pittosporum insigne var. B Hillebr.; BISH sheets has a label produced by C. N. Forbes giving collectors as Hillebrand & Lydgate.

=Pittosporum glabrum
Note: Sherff based his name on Pittosporum insigne var. B Hillebr.; BISH sheets has a label produced by C. N. Forbes giving collectors as Hillebrand & Lydgate.

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

Pittosporum insigne Hillebr. var. micranthum Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 415. 1941.
Type information:
Holotype [BISH]. C.N. Forbes 1800.M. 1 March 1920. Maui: East Maui, Kanaio, on S slope of Haleakala. Isotype(s) [B, BISH! [2], F, K].
=Pittosporum glabrum

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

Pittosporum insigne Hillebr. var. pelekunuanum Sherff, Field Mus. Nat. Hist., Bot. Ser. 22: 416. 1941.
Type information:
Holotype [BISH]. C.N. Forbes 586.Mo. September 1912. Moloka`i: Pelekunu Valley. Isotype(s) [BISH!].
=Pittosporum glabrum

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