1. Family: Phyllanthaceae Martinov
    1. Genus: Leptopus Decne.
      1. Leptopus hainanensis (Merr. & Chun) Pojark.

        This species is accepted, and its native range is SW. & S. Hainan.

    [KBu]

    Vorontsova, M.S. & Hoffmann, P. 2009. Revision of the genus Leptopus (Phyllanthaceae, Euphorbiaceae sensu lato). Kew Bulletin 64: 627. DOI: https://doi.org/10.1007/s12225-009-9155-x

    Type
    Andrachne hainanensis Merr. & Chun var. nummulariifolia Merr. & Chun (1940: 103), as ‘nummularifolia’. Type: China, Hainan, Yaichow, Wui-Ling, Tai-Mao, 30 Oct. 1933, Wang 34930 (holotype IBSC!; isotypes A!, NY!). Location of the holotypes is not indicated in the protologue of A. hainanensis and A. hainanensis var. nummulariifolia. Woon Young Chun carried out this work at IBSC in Guangzhou under Merrill’s direction and the IBSC duplicates have Chun’s identification slips and the “Bot. No.” numbers cited in the protologue.
    Habit
    Monoecious (often apparently dioecious) erect shrub, 0.5 – 3 m
    Twigs
    Twigs terete, hirsute, white to light brown, much lighter than leaves
    Stipules
    Stipules deltoid, basally not auriculate, apically acute, almost black, 0.8 – 1 × 0.3 – 0.6 mm, hirsute, margin entire, sparsely ciliate
    Petiole
    Petiole 1.5 – 4 × 0.3 – 0.4 mm, ¼ – ⅛ of leaf blade length, hirsute
    Leaves
    Leaf blade ovate to elliptic, sometimes orbicular or obovate, basally acute, sometimes obtuse or rounded, apically acute, sometimes obtuse or rounded, (0.2) 0.4 – 1.5 (2) × (0.2) 0.3 – 0.8 (1.5) cm, 1 – 3 times longer than wide, thick chartaceous, drying slightly to strongly discolorous grey, dark red or brown, glabrous adaxially, glabrous to sparsely hirsute abaxially, margin glabrous to hirsute; midvein adaxially flat, abaxially prominent, secondary veins not visible or 2 – 3 pairs, adaxially flat, abaxially flat
    Inflorescences
    Inflorescences unisexual, male inflorescence axis 0 – 3 mm long
    Bracts
    Bracts as stipules
    Flowers
    Male flowers 1 – 3 per fascicle, 0.7 – 1.5 × 1.5 – 2.5 mm Female flowers solitary, 2.5 – 5 × 3.5 – 6 mm, 2.5 – 3 times larger than males, rotate
    Pedicel
    Pedicel 1 – 2 × less than 1.5 mm, articulate just above base, hirsute Pedicel 7 – 14 mm long, not articulate, hirsute Fruiting pedicel 9 – 14 mm long
    Calyx
    Sepals 5, obovate to oblong, apically rounded, 1.2 – 2 × 0.7 – 0.8 mm, membranaceous, without veins, rarely 1-veined, hirsute outside, glabrous inside, margin entire to erose, ciliate, eglandular Sepals 5 (6), obovate, apically obtuse to cuspidate, 2 – 4 × 1 – 2 mm, 0 – 1-veined, glabrous to hirsute outside, glabrous to hirsute inside, margin entire, ciliate, eglandular Mature sepals not accrescent
    Corolla
    Petals 5, linear to narrow obovate, apically acute to rounded, 0.8 – 1.2 × 0.15 – 0.25 mm, ⅔ – ¾  of sepal length, membranaceous, without veins, glabrous on both sides, margin entire to erose, glabrous Petals 5 (6), linear, apically acute, 0.2 – 1 × 0.1 mm, slightly shorter than disc or extending slightly beyond disc, without veins, glabrous
    Disc
    Disc bilobed for ½ – ⅔ of length, lobes apically rounded to truncate, 0.5 – 0.7 × 0.2 – 0.25 mm, ⅓– ½ as long as sepals, ½ as long as the petals Disc bilobed for ⅓ – ½ of length, 0.5 – 0.8 × 0.3 – 0.7 mm, apically rounded, erose, up to ¼ of sepal length
    Stamens
    Stamens 5, 1.2 – 1.6 mm long; filaments 1 – 1.5 mm long, glabrous; anthers 0.2 – 0.3 × 0.25 mm
    Pistillodes
    Pistillode trilobed for ½ of length, 0.8 – 1.1 mm long, ⅓ – ½ of stamen length, glabrous to hirsute
    Ovary
    Ovary 3 (4)-locular, hirsute; styles 3 (4), 1 – 1.3 mm long, free, mostly glabrous; stigmas dilated
    Fruits
    Fruit 2.5 – 3.5 × 4 – 5 mm, smooth to faintly reticulate, hirsute, drying red brown Columella widest at base, apically linear, 1 – 2.5 × c. 0.5 mm
    Seeds
    Seeds triquetrous, 2 – 2.5 × 1.5 – 2 × 1.5 – 2 mm, without appendages, smooth, orange
    Embryo
    Embryo with radicle up to ½ as long as cotyledons.
    Distribution
    China: Hainan. Map 3.
    Ecology
    Riverine forest ; 0 – 500 m.
    Conservation
    Vulnerable (VU, B1a,b(iii)) (IUCN 2001). Extent of occurrence is below 20,000 km2 and only six localities are known; tourism and industry expansion is an increasing threat to Hainan endemics.
    Note
    This species is easily distinguishable by its whitish stems, small leaves and short male pedicels. It is most likely affiliated with Leptopus chinensis; unfortunately no recent material was available for DNA analysis.

    Distribution

    Leptopus hainanensis (Merr. & Chun) Pojark. appears in other Kew resources:

    First published in Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 20: 271 (1960)

    Accepted by

    • Vorontsova, M.S. & Hoffmann, P. (2010). Revision of the genus Leptopus (Phyllanthaceae, Euphorbiaceae sensu lato) Kew Bulletin 64: 627-644.

    Not accepted by

    • Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Andrachne hainanensis.]

    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