Abstract
A new species of Lauraceae, Cryptocarya kaengkrachanensis M.Z.Zhang, Yahara & 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.
Highlights
Lauraceae, a plant family widely distributed across the world, contain an estimated 2500–3500 species in about 50 genera, and its highest species richness is found in the tropical forests of Southeast Asia and the Americas (Rohwer 1993, Li et al 2008, Rohwer et al 2014, Yahara et al 2016)
We examined specimens kept at the herbaria BKF, BO, FOF, FU, KAG, KYO, RUPP, SAR, SNP and VNM, and reviewed taxonomic literature of Cryptocarya in Southeast Asia (Lecomte 1914, Liou 1934, Kostermans 1988, Kochummen 1989, Hô 1999, Dy Phon 2000, Newman et al 2007, Li et al 2008, de Kok 2015, 2016a, Liu et al 2017)
In Kaeng Krachan National Park, we found three species of Cryptocarya that grew at different elevations
Summary
A plant family widely distributed across the world, contain an estimated 2500–3500 species in about 50 genera, and its highest species richness is found in the tropical forests of Southeast Asia and the Americas (Rohwer 1993, Li et al 2008, Rohwer et al 2014, Yahara et al 2016). In Southeast Asia, trees of Lauraceae occur widely from lowlands to high elevations (van der Werff 2001, Ngernsaengsaruay et al 2011, Wuu-Kuang 2011, de Kok 2015, 2016a, 2016b, Yahara et al 2016), and are often among the most dominant components of the canopy in montane forests (Ohsawa 1991, Tagawa 1995, Sri-Ngernyuang et al 2003). We document three species of Cryptocarya as occurring in Kaeng Krachan National Park, Phetchaburi Province, southwest Thailand, namely C. amygdalina Nees, C. pustulata Kosterm. and a new species, described below
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