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

        This species is accepted, and its native range is N. Thailand.

    [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: Thailand, Nan Province, Pua, Doi Phu Kha National Park [19°11'55''N 101°4' 46''E], 1700 m, 17 Aug. 1995, Pooma 1112 (holotype BKF! [BKF 102045]).
    Habit
    Climber
    Indumentum
    Indumentum very sparse except at the distal end of branchlets; hairs spreading
    Branches
    Branches subterete, slightly ridged, smooth; branchlets ridged
    Stipules
    Stipules fugaceous
    Leaves
    Leaves: lamina elliptic, 3.0 - 8.1 cm long, 1.8 - 3.1 cm wide, chartaceous-subcoriaceous, apex with a short obtuse acumen, mucronulate, base weakly asymmetric, cuneate to decurrent, margins inconspicuous­ly crenate-serrate, serrations topped by callosities; lamina glabrous on both sides; primary vein sparsely hairy on both sides of lamina, prominent abaxially; secondary veins 5 - 7 pairs, subglabrous, moderately to conspicuously prominent abaxially, remaining separate near margin or indistinctly connected by secondary vein branches, angle of diver­gence from primary vein usually 35° - 55°; domatia inconspicuous; tertiary veins spaced every c 0.5 mm; reticulations distinct abaxially, inconspicuous adaxially; petiole 2 - 5 mm long, sparsely hairy
    Inflorescences
    Inflorescence fascicles borne in the axils of persistent leaves; flowers unknown
    Fruits
    Fruit crustaceous, narrow-ovate, 5.2 - 5.6 cm long, 1.0 - 2.8 cm wide, with no distinct wing-like apical appendage, apex rounded, base inflated, evenly shaped
    Note
    Most similar to Smythea lanceata with respect to the inflated glabrous fruit, widest near their base and borne in the axils of persistent leaves, but differs in the 5 - 7 pairs of secondary veins, set closer to each other along the primary vein, with the veins midway along separated by c. a fifth of the total lamina length, and in the absence of conspicuous domatia.

    Smythea poomae is named in honour of botanist Rachun Pooma, based at the Bangkok Forest Herbarium, who has undertaken much botanical exploration throughout Thailand and collected the type specimen in 1995.

    Smythea poomae is easily recognised by its inflated, wingless fruit with a rounded apex and secondary veins relatively close to each other along the primary vein. The only other species with an inflated fruit in the genus is S. lanceata but this is found mainly in coastal and mangrove habitats. In this region of Thai­land adjacent to Indo-China (as applied to Cambodia, Laos and Vietnam and usually excluding Thailand), S. poomae is the only recorded taxon of Smythea from the Luang Prabang Range. Smythea oblongifolia is found in many parts ofThailand but differs in having leaves with a narrower angle of divergence of secondary veins and leafless panicles with fruit which are hairy and have a wing-like appendage. Smythea poilanei was collected in Laosin nearby Vientiane Prefecture but differs in having leaves with a rounded to broadly cuneate base, 2-4 pairs of secondary veins and conspicuous domatia; in addi­tion, the species are unlikely to be sympatric, as biogeographically, the floras of Nan and Vientiane are quite different, with the Vientiane flora more similar to that from the north-eastern Thai Provinces of Nong Khai and Bueng Kan (Middleton, pers. comm.).

    Distribution
    Only known from Doi Phu Kha National Park in Nan Province, Thailand. Map 1.
    Ecology
    Luang Prabang montane rain forest; alt. 1700 m.
    Conservation
    Data deficient (DD). IUCN Standards and Petitions Subcommittee Guidelines (2016) state that if data are so uncertain that both Critically Endangered (CR) and Least Concern (LC) are plausible categories, the DD category can be used for a taxon. The only specimen available was collected in 1995 and the species is known only from a single collection location in the Luang Prabang Range and thus meets the B1a criterion for Critically Endangered (CR) status.However,thespecies was found inside an IUCN Category II (National Park) area. Lack of collections and field observations of the species do not allow inference of decline or fluctuation in population size or EOO and AOO.
    Phenology
    Collected in fruit in August.

    Distribution

    Native to:

    Thailand

    Smythea poomae 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