Plantago grayana Pilg. , Repert. Spec. Nov. Regni Veg. 19: 115. 1923.
Type information:
Syntype [US]. A.S. Hitchcock 16467. October 1916. Kaua`i: Wai`ale`ale.1200 to 1700m.

Note: Additional syntype: 16471.

=Plantago pachyphylla
Note: Additional syntype: 16471.

*Verification: None.

Plantago grayana Pilg. f. subglabra Skottsb., Acta Horti Gothob. 15: 459. 1944.
Type information:
Syntype [BISH]. L.M. Cranwell , O.H. Selling and C. Skottsberg 3046. 23 August 1938. Kaua`i: summit bog of Wai`ale`ale.1570m.

Note: Without description. Specimen labeled "f.glabrifolia".

=Plantago pachyphylla
Note: Without description. Specimen labeled "f.glabrifolia".

*Verification: None.

Plantago grayana Pilg. var. abrotanelloides Skottsb., Acta Horti Gothob. 15: 460. 1944.
Type information:
Syntype [BISH]. L.M. Cranwell , O.H. Selling and C. Skottsberg 3104. 23 August 1938. Kaua`i: Wai`ale`ale, on summit.1570m.
=Plantago pachyphylla

*Verification: None.

Plantago grayana Pilg. var. pusilla (Wawra) Skottsb., Acta Horti Gothob. 15: 459. 1944. Flora of the Hawaiian Islands --Basionym
Type Information
Plantago pachyphylla A. Gray var. pusilla Wawra, Flora 57: 568 1874.
Kaua`i: plateau of Wai`ale`ale. 1869- 1870. H. Wawra 2165.
Holotype [W].
=Plantago pachyphylla

*Verification: None.
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*Verification: None.