| Orthocarpus luteus Nutt. | Love, A. & D. Love. 1982. In: A Löve (ed.), IOPB chromosome number reports LXXV. Taxon 31(2): 344–360. | 82-83 | | 38 |
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| Orthocarpus luteus Nutt. | Ward, D. E. 1983. Chromosome counts from New Mexico and southern Colorado. Phytologia 54: 302–309. | 82-83 | 14 | |
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| Orthocarpus luteus Nutt. | Chuang, T. I. & L. R. Heckard. 1982. Chromosome numbers of Orthocarpus and related monotypic genera (Scrophulariaceae: subtribe Castillejinae). Brittonia 34: 89–101. | 82-83 | 14 | |
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| Orthocarpus luteus Nutt. | Parfitt, B. D., D. J. Pinkava, D. Rickel, D. Fillipi, B. Eggers & D. J. Keil. 1990. Documented chromosome numbers 1990: 1. Miscellaneous North American vascular plants. Sida 14: 305–308. | 90-91 | 14 | |
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| Orthocarpus luteus Nutt. | Chuang, T. I. & L. R. Heckard. 1992. A taxonomic revision of Orthocarpus (Scrophulariaceae---tribe Pediculareae). Syst. Bot. 17(4): 560–582. | 92-93 | 14 | |
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