Kirkbride J. H., Wiersema J. H., Delprete Piero. (2012). (2063-2065) Proposals to reject the names Spermacoce strigosa and S. hyssopifolia Sm. and conserve the name S. hyssopifolia Willd. ex Roem. and Schult. (Rubiaceae). Taxon, 61 (2), p. 475-476. ISSN 0040-0262.
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(2063-2065) Proposals to reject the names Spermacoce strigosa and S. hyssopifolia Sm. and conserve the name S. hyssopifolia Willd. ex Roem. and Schult. (Rubiaceae)
