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Their obligate pollination mutualism with yucca moths is considered a \u201ctextbook example\u201d of coevolution and is hypothesized to have promoted rapid diversification. However, testing this hypothesis has been difficult due to uncertainty about the placement of a rogue taxon,\n                      <jats:italic>Yucca queretaroensis<\/jats:italic>\n                      , a rare endemic of the Sierra Gorda region of central Mexico. Past work placed this species in different positions within the Agavoideae, producing starkly different age estimates for\n                      <jats:italic>Yucca<\/jats:italic>\n                      (25 to 4 million years).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We generated new sequence capture data for 353 nuclear genes and for all coding regions of the plastid genome from wild\u2010collected plants and samples included in previous studies to provide a new phylogeny and new age estimate for\n                      <jats:italic>Yucca<\/jats:italic>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The data presented here suggest that\n                      <jats:italic>Y. queretaroensis<\/jats:italic>\n                      is closely related to other species of\n                      <jats:italic>Yucca<\/jats:italic>\n                      . A relaxed molecular clock analysis of the plastid genome produced an estimated age for the genus of approximately 6.8 million years.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      The results resolve a mystery that has bedeviled evolutionary biologists for decades and provide a surprisingly young estimate for the age of\n                      <jats:italic>Yucca<\/jats:italic>\n                      , suggesting rapid diversification. The past difficulties in identifying the correct placement of\n                      <jats:italic>Y. queretaroensis<\/jats:italic>\n                      appear to be the product of laboratory errors, mistakes in field identification, and frequent hybridization with co\u2010distributed taxa. The \u201c\n                      <jats:italic>Yucca queretaroensis<\/jats:italic>\n                      problem\u201d reaffirms the essential role for traditional botanical tools in phylogenomics.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/ajb2.70259","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T06:21:36Z","timestamp":1789021296000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Resolving the \u201c\n                    <i>Yucca queretaroensis<\/i>\n                    problem\u201d: Phylogenomic analysis of\n                    <i>Yucca<\/i>\n                    reveals the identity of an enigmatic species and the origin of an obligate pollination mutualism"],"prefix":"10.1002","volume":"113","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-9215-7567","authenticated-orcid":false,"given":"Christopher 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