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B. triplinervia var. macrantha f. octoradiata Sherff (Bot. Gaz. 92: 203. 1931) has heads similarly 8-rayed, but is very different in its retrorsely barbed achenial aristae and its fewer external phyllaries. It is not known from north of Guatemala.
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Sherff, E.E. Some new or otherwise noteworthy Coreopsidinae (Compositae) from Mexico. Brittonia 16, 58–73 (1964). https://doi.org/10.2307/2805184
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DOI: https://doi.org/10.2307/2805184