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Many models have attempted to predict these patterns, but to date, most have focused on monocots with parallel veins. These provide a simple system to study, but do not represent the majority of plant species. Here, a new protocol is developed using a Picarro induction module coupled to a cavity ringdown spectrometer to obtain maps of the leaf water isotopes (<jats:sup>18<\/jats:sup>O and <jats:sup>2<\/jats:sup>H). The technique is applied to <jats:styled-content style=\"fixed-case\"><jats:italic>Colocasia esculenta<\/jats:italic><\/jats:styled-content> leaves. The results are compared with isotope ratio mass spectrometry. In <jats:styled-content style=\"fixed-case\"><jats:italic>C.\u00a0esculenta<\/jats:italic><\/jats:styled-content>, a large enrichment in the radial direction is observed, but not in the longitudinal direction. The string\u2010of\u2010lakes model fails to predict the observed patterns, while the Farquhar\u2013Gan model is more successful, especially when enrichment is accounted for along the radial direction. Our results show that reticulate\u2010veined leaves experience a larger enrichment along the axis of the secondary veins than along the midrib. We hypothesize that this is due to the lower major\/minor vein ratio that leads to longer pathways between major veins and sites of evaporation.<\/jats:p>","DOI":"10.1111\/pce.13002","type":"journal-article","created":{"date-parts":[[2017,6,28]],"date-time":"2017-06-28T22:02:41Z","timestamp":1498687361000},"page":"2095-2108","source":"Crossref","is-referenced-by-count":12,"title":["Leaf water <sup>18<\/sup><scp>O<\/scp> and <sup>2<\/sup><scp>H<\/scp> maps show directional enrichment discrepancy in <scp><i>Colocasia esculenta<\/i><\/scp>"],"prefix":"10.1111","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8160-6167","authenticated-orcid":false,"given":"Cynthia","family":"Gerlein\u2010Safdi","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering Princeton University  Princeton NJ 08544 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2893-7861","authenticated-orcid":false,"given":"Paul P.\u00a0G.","family":"Gauthier","sequence":"additional","affiliation":[{"name":"Department of Geosciences Princeton University  Princeton NJ 08544 USA"},{"name":"Department of Biology University of New Mexico  Albuquerque NM 87131 USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Craig James","family":"Sinkler","sequence":"additional","affiliation":[{"name":"Department of Geological, Environmental, and Marine Sciences Rider University  Lawrenceville NJ 08648 USA"},{"name":"EarthRes Group Inc.  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