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.
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.
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
Plantago grayana Pilg. var. pusilla (Wawra) Skottsb., Acta Horti Gothob. 15: 459. 1944.