Abstract
Yucca muscipula is described and illustrated as a new species endemic to the Barranca de Metztitlán Biosphere Reserve, Hidalgo, Mexico. This species is morphologically related to Y. mixtecana but is shorter, has a stem that lacks branching, and has glaucous leaves that are linear, with papillae on both surfaces and an entire margin, separating into recurved filaments. When dry, the leaves of Y. muscipula persist in the distal portion of the stem after the first flowering. It can grow sympatrically with Y. filifera, that also has a pendulous inflorescence and papillose filaments across entire surface, but from which it differs in several traits including glabrous branches, and larger flowers and fruits.
References
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<p>IUCN. (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria</em>. Version 14. Prepared by the Standards and Petitions Committee. Available from: https://www.iucnredlist.org/resources/categories-and-criteria (accessed 10 August 2021).</p>
<p>Johnston, I.M. (1923) Diagnoses and notes relating to the spermatophytes chiefly of North America. <em>Contributions from the Gray Herbarium of Harvard University</em> 68: 86.</p>
<p>Johnston, M.C. (1962) The North American mesquites <em>Prosopis</em> Sect. <em>Algarobia</em> (Leguminosae). <em>Brittonia </em>14 (1): 72–89. https://doi.org/10.2307/2805322</p>
<p>John, V. & Říha, J. (1983) Formální pribuzné nékterých zástupcú rodu Gymnocactus Backbg. do rodu Turbinicarnus (Backbg.) Buxb. et Backbg. (Unkombinationen aus Gymnocactus in die Gattung Turbinicarpus). <em>Kaktusy</em> 17: 15–18.</p>
<p>Lenz, L.W. (1998) <em>Yucca capensis </em>(Agavaceae, Yuccoideae), a new species from Baja California Sur, Mexico. <em>Cactus and Succulent Journal</em> 70 (6): 289–296.</p>
<p>Lenz, L.W. (2007) Reassessment of <em>Yucca brevifolia</em> and recognition of <em>Y. jaegeriana</em> as a distinct species. <em>Aliso</em> 24: 97–104. https://doi.org/10.5642/aliso.20072401.07</p>
<p>Linnaeus, C. (1753) <em>Species Plantarum</em>. Holmiae Impensis Laurentii Salvii, Stockholm, 1200 pp. Available from: https://www.biodiversitylibrary.org/page/39403811 (accessed 10 August 2021).</p>
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