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| Gentianella tayacajensis S.J. Castillo, H. Beltrán & J.S. Pringle, in Castillo, Beltrán et Pringle, 2025. |
Abstract
A new species from Peru, Gentianella tayacajensis, collected in the department of Huancavelica, Tayacaja province, is described and illustrated. It is morphologically close to G. tristicha, G. graminea and G. oreosilene, from which it is distinguished by presenting rotaceous corollas with narrowly oblanceolate coroline lobes, 18-22 mm long and 5-6.2 mm wide; also, by the presence of filiform trichomes with rounded protuberances inside the corolla. The morphological differences between the new species and related species are discussed and its geographic distribution is mapped.
Keywords: Endemic, floral trichome, Swertiinae, taxonomy, Andean
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| Gentianella tayacajensis: A, plant habit; B, corolla and androecium; C, calyx; D, bract; E, bract colleters; F, ginoecium. Drawings by Susy J. Castillo. |
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| Gentianella tayacajensis: A, habitat; B, plant habit; C, basal branching; D, flowers; E, fruits; F, corolla trichomes. Photographs by Susy J. Castillo. |
Gentianella tayacajensis S.J. Castillo, H. Beltrán & J.S. Pringle, sp. nov.
Diagnosis. Gentianella tayacajensis sp. nov. is morphologically closer to Gentianella tristicha (Gilg) J.S. Pringle, Gentianella graminea (Kunth) Fabris and Gentianella oreosilene (Gilg) J.S. Pringle; but differs from G. tristicha in its opposite (vs. verticillate) leaves and narrowly obovate corolla lobes 18–22 mm long and 5–6.2 mm wide (vs. wide obovate, 13–19 mm long and 6–10 mm wide); from G. graminea in its lilac, rotate (vs. white, campanulate) corolla, and longer and narrower corolla lobes (vs. obovate, 10–14 mm long and 6–9.5 mm wide); from G. oreosilene in its pedicels 13–50 mm long (vs. 10–20 mm long), rotate (vs. campanulate) corolla, 26–31 mm long (vs. 15–17 mm long), and longer corolla lobes (vs. 11–12 long); and from all three species in presence of filiform adaxial corolla trichomes with rounded protuberances (vs. trichomes smooth in G. graminea and G. tristicha, absent in G. oreosilene).
Susy Juanita Castillo, Hamilton Beltrán and James S. Pringle. 2025. Gentianella tayacajensis (Gentianaceae), A New Species from Perú. Darwiniana, Nueva Serie, 13(1), 145–152. DOI: doi.org/10.14522/darwiniana.2025.131.1266
