1. Family: Rhamnaceae Juss.
    1. Genus: Smythea Seem.
      1. Smythea poilanei Cahen & Utteridge

        This species is accepted, and its native range is Laos.

    [KBu]

    Cahen D & Utteridge T. 2018. A synopsis of the genus Smythea (Rhamnaceae). Kew Bulletin 73: 2. DOI 10.1007/S12225-017-9724-3

    Type
    Type: Laos, Vientiane Prefecture, Ban Tha Ngon Road [18°5'N 102°40'E], 170 m, 1 Oct. 1955, de Malahide 88 (holotype K! [K000606765]; isotypes K! [K000606766], SING).
    Habit
    Climbing shrub 6 - 8 m long
    Indumentum
    Indumentum dense at distal end of branchlets with subappresed, antrorse, fulvous hairs
    Branches
    Branches slender, slightly angular, smooth, greyish-brown; branchlets ridged, with a transparent outer layer some­times peeling in thin translucent strips
    Stipules
    Stipules fugaceous, occasionally persistent and seen at fruiting stage, linear, hairy
    Leaves
    Leaves: blade narrow ovate, 1.5 - 8.5 cm long, 0.8 - 3.8 cm wide, chartaceous-subcoriaceous, apexattenuateto long acuminate, mucronulate, base asymmetric, rounded to broadly cuneate, margins widely crenate-serrate, ob­scurely near base, serrations topped by black callosities; veins yellow with a faint reddish tint; primary vein subglabrous, more densely hairy near the base, promi­nent abaxially; secondary veins 2 - 4 pairs, the second pair from the leaf base consistently much closer to the first than to the third pair, weakly to moderately prominent abaxially, sometimes connected by secondary vein branches or directly joining near apex, angle of divergence from primary vein usually 35 - 45°; domatia conspicuous, hairs on both veins and lamina surface at secondary vein axils; tertiary veins perpendicular to primary vein, spaced every c 0.5 mm; reticulations indistinct; lamina glabrous abaxially except for domatia, hairy along the primary and some secondary veins on the adaxial side; petiole 1 - 4 mm long, hairy.
    Inflorescences
    Inflorescence fascicles borne in the axils of persistent leaves; pedicels to 7 mm long, slender, with very short hairs at an early stage (subglabrous at the fruiting stage); calyx lobes c 0.7 mm long, keeled adaxially; nectary disk with short papillae; ovary hairy
    Fruits
    Fruit subglabrous to very sparsely hairy, sparsely hairy near base, fruit brown, reddish-brown near base, oblong, 4.0 - 6.1 cm long, 0.9 - 1.3 cm wide, slightly twisted near base, apex obtuse-rounded
    Note
    Most similar to Smythea batanensis and S. beccariiin the number of secondary veins and very sparsely hairy fruit borne in the axils of persistent leaves, but differs in its indistinct high order venation reticulations, in its more closely spaced tertiary veins, separated from each other by c. 0.5 mm, in its second pair of lateral veins starting from the base consistently much closer to the first than to the third pair, and in its leaf blades which have a longer acumen.

    Smythea poilanei is named in honour of botanist Eugene Poilane (1887 - 1964) who collected specimens in the Savannakhet area in 1938.

    The only other taxon of Smythea found in Laos is S. oblongifolia, which S. poilanei differs from in the subglabrous fruit borne in the axils of persistent leaves and the fewer, weakly to moderately prom­inent secondary veins remaining separate near the leaf margin. Smythea poomae is found in Thailand's Nan Province near the Lao border but differs by its inflated narrow-ovate fruit and by its leaves which have a cuneate to decurrent lamina base and 5 - 7 pairs of secondary veins.

    Distribution
    Laos: near Vientiane and in Savannakhet area. Map 1.
    Ecology
    Central Indochina dry forests (putative); alt. c. 150 m.
    Conservation
    Endangered EN B2ab(iii). This species is only known from two collections from two locations (hence, only the AOO of 8 km2 can be calculated: less than EN threshold of 500 km2 using a cell size of 2 km), and both relatively historic (the most recent being from 1955). The collections are outside protected areas, and in provinces that have been subject to much habitat conversion with documented continuing clearing of the natural dry forests in Laos (Wikramanayake et al.2001). Whilst the collection density of Laos is extremely low (see Newman et al.2007), and there is obviously much uncertainty when estimating threat in such poorly known regions, we have used a precautionary attitude (following IUCN 2012: 23) and, from the information available assume the species is threatened.
    Phenology
    Collected in fruit in Oct.

    Distribution

    Smythea poilanei Cahen & Utteridge appears in other Kew resources:

    First published in Kew Bull. 73(1)-2: 21 (2018 publ. 2017)

    Sources

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Bulletin
    Kew Bulletin
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0