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A new species of   Lauraceae  ,    Cryptocarya   kaengkrachanensis    M.Z.Zhang, Yahara &amp; Tagane, from Kaeng Krachan National Park, Phetchaburi Province, southwestern Thailand, is described and illustrated. This species is morphologically most similar to    C.   amygdalina    in that its leaves are pinnately veined, leathery, and apparently glabrous (but microscopically hairy) abaxially, twigs are yellowish brown hairy, and fruits are 1.36 to 1.85 times longer than width. However,    C.   kaengkrachanensis    is distinguished from    C.   amygdalina    in having the leaves of ovate and elliptic (vs. oblong-lanceolate) with leaf aspect ratio (length:width) from 1.38 to 2.28 (vs. 2.46–3.43), and ovoid fruits (vs. ellipsoid) with stalk distinctly swollen (vs. not or only slightly swollen). In addition, phylogenetic trees constructed based on internal transcribed spacer sequences ( ITS ) and genome-wide SNPs using MIG-seq showed that    C.   kaengkrachanensis    is not sister to    C.   amygdalina    and is distinct from all the other    Cryptocarya    species hitherto recognized in Thailand. Analysis including other species demonstrates that    C.   floribunda    should be a synonym of    C.   amygdalina   , but we recognize    C.   scortechinii    as a distinct species.

Cryptocarya kaengkrachanensis , a new species of Lauraceae from Kaeng Krachan National Park, southwest Thailand