4614212 763483 Penstemon confertus Douglas [80 763369 Penstemon attenuatus Douglas ex Lindl.] J. Lindley, Edwards’s Bot. Reg., vol. 15 : t. 1295 (1829) [M. Hart]
8594812 763536 Penstemon deustus Douglas [80 763662 Penstemon heterander Torrey & A. Gray] J. Torrey, Pacif. Railr. Rep., vol. 2 fasicle 1, : t. 8 (1853-1855)
4612412 763598 Penstemon fruticosus (Pursh) Greene [80 763981 Penstemon scouleri Douglas ex Lindl.] J. Lindley, Edwards’s Bot. Reg., vol. 15 : t. 1277 (1829) [M. Hart]
42786312 763598 Penstemon fruticosus (Pursh) Greene [80 763981 Penstemon scouleri Douglas ex Lindl.] Ann. Fl. Pomone, vol. 6 : t. 17 (1838)
459802 764053 Penstemon venustus Douglas J. Lindley, Edwards’s Bot. Reg., vol. 16 : t. 1309 (1830) [M. Hart]
4277622 764053 Penstemon venustus Douglas Ann. Fl. Pomone, vol. 3 : t. 10 (1835)
592782 764073 Penstemon whippleanus A. Gray Addisonia, vol. 20 : t. 671 (1938) [M. Sorensen]
1641692 764080 Penstemon wrightii Hook. J. Cassin, J.B. Lippincott, Illustrations of the birds of California, Texas, Oregon, British and Russian America: t. 47 (1862)