1. Family: Stemonuraceae Kårehed
    1. Genus: Medusanthera Seem.
      1. Medusanthera gracilis (King) Sleumer

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

    [KBu]

    Utteridge, T.M.A. Kew Bull (2011) 66: 49. https://doi.org/10.1007/s12225-011-9266-z

    Habit
    Tree 5 – 10.7 m high, girth 4 – 15 cm
    Indumentum
    Indumentum of simple appressed hairs, translucent, colourless or pale yellow to pale ginger-brown, 0.15 – 0.35 mm long (see description of specific structures for distribution)
    Branches
    Branches 1 – 2 mm in diameter, densely hairy soon glabrous, drying dull olive-brown
    Leaves
    Leaves membranaceous to chartaceous, narrowly elliptic, (3.3 –) 6.5 – 10 (– 15.3) × (0.8 –) 1.7 – 3.6 (– 5) cm, apex acute to attenuate, base cuneate; ad- and abaxial lamina sparsely hairy soon glabrous, lamina drying dark olive-green adaxially, dull-green abaxially; midrib adaxially sulcate and sparsely hairy when young, soon glabrous, abaxially prominent and hairy when young soon glabrous; secondary veins brochidodromus, not enclosed by secondary arches, 4 – 6 (– 8) pairs, glabrous, somewhat prominent ad- and abaxially; tertiary veins inconspicuous; petioles 4.5 – 10.5 (– 15) mm long, densely hairy when young soon glabrous
    Inflorescences
    Staminate inflorescences axillary in the terminal axils of the branches, umbellate with ultimate branches terminating in a cyme or irregular cyme, primary axis 10.9 – 33 mm long with 4 first order branches at the apex, branched to 3 orders, glabrous to hairy, becoming densely hairy especially toward the most distal branching points; pedicels 0.5 – 0.9 mm long, hairy or sparsely hairy Pistillate inflorescences and flowers as staminate except inflorescence primary axis to 50 (– 81) mm long, staminodes with sterile anthers 0.2 mm long, filaments 2 – 2.4 mm long, glabrous; ovary cylindrical, 2.3 – 2.7 × 0.6 – 1.2 mm, glabrous
    Flowers
    Staminate flowers pentamerous, calyx gamosepalous, crateriform, 0.5 – 0.7 mm long, shallowly 5-lobed, glabrous; petals white, cream coloured or light yellowish green white, narrowly oblong, 2.4 – 3.4 mm long; stamens with anthers 0.3 – 0.5 mm long, filaments very narrowly oblong, 1.6 – 2.4 mm long, hairy to densely hairy with linear, clavate membranous hairs, 1.5 – 2 mm long on the ad- and abaxial surface from halfway along the filament to immediately below the anthers; pistillode ovoid, 1.1 – 1.3 × 0.5 – 0.7 mm, glabrous
    Fruits
    Fruits narrowly elliptic to narrowly oblong, truncate at the base, apex cuneate, glabrous; when dry putamen flat or curved, 12.2 – 19.3 × 5.2 – 6.6 mm and 2.4 – 4.1 mm thick (dimensions include drupe and appendage), putamen with a central ridge with 1 – 3 smaller ridges on either side on the convex side, pulviniform appendage oblong, covering the central area of the concave surface; when fresh drupe fruits very glossy, green, pulviniform appendage fleshy, yellowish-green or white.
    Distribution
    Distributed in western Malesia in the following countries: Malaysia: restricted to, but throughout, the peninsula; Indonesia: restricted to northern Sumatra; Thailand: currently known from a single collection from southern part of Yala Province.
    Ecology
    Primary and disturbed forest, hill forest and bamboo forest (Malaysia); evergreen forest (Thailand); (30 –) 120 – 1400 m.
    Conservation
    Least Concern (LC). Medusanthera gracilis is known from 49 collections from 31 localities throughout its distributional range from diverse habitats; the EOO (182,339 km2) suggests a rating of LC. Habitat conversion in Peninsular Malaysia and Sumatra, however, is occurring at a rapid pace (see e.g., Aiken & Leigh 1992; Soh et al. 2006), and areas of natural habitat are becoming fragmented. Examination of the region using satellite imagery shows that many of the collection points are still covered with some habitat (although the quality and type of habitat is unknown) and, because of the wide distribution and broad habitat preferences of this species, a rating of LC is recommended at this time. Further fieldwork in the region may show, however, that some of the localities should not be used for calculating the IUCN rating, such as those close to cities or towns.
    Vernacular
    Kaju si gorga (Asahan); sampin kris (Kelantan) (Sleumer 1971).
    Note
    Medusanthera gracilis can be confused with species of Gomphandra in Peninsular Malaysia especially when fruits are not available. However, Gomphandra species can be distinguished from M. gracilis by their exserted stamens (M. gracilis has inserted stamens), the inflorescence arrangement (irregularly branching to 1 or 2 orders only), and the erect hairs — often ginger in colour — which are persistent on the leaves, branches and inflorescences (M. gracilis is glabrescent). Sleumer’s reference (1969, 1971) to “Gomphandra lanceolata (Mast.) King var. angustifolia King apud Ridl. Fl. Malay. Peninsula 1: 429 (1922) pro parte” and placement of that name as a synonym of M. gracilis, is due to Sleumer’s assumption that some of the specimens cited by Ridley as G. lanceolata (Mast.) King var. angustifolia King are actually M. gracilis. However, examination of the K material places them as Ridley initially determined them, i.e., outside of M. gracilis, as species of Gomphandra. I believe that, in this case, all of Ridley’s determinations are correct, hence the removal of the reference to G. lanceolata var. angustifolia as a synonym of M. gracilis in the taxonomy above. This species was not included in Howard’s revision of the genus (Howard 1943b). Medusanthera gracilis is a distinctive species on account of its habit (a small tree, recorded to 10.7 m), the leaf morphology (lamina membranaceous to chartaceous, narrowly elliptic, relatively small usually 6.5 – 10 × 1.7 – 3.6 cm), and the umbellate inflorescence which is initially axillary in the terminal axils of the branches with 4 first order branches at the apex of the primary axis. However, leaf size can be very variable within this species; M. gracilis var. gracillima Ridl. was described because of the very small leaves, but even in a single collection, see for example Ogata KEP 110213, leaf size can vary between the smallest and largest measurements recorded. The only other species of Medusanthera in western Malesia (Peninsular Malaysia and Sumatra) and Thailand is M. malayana Utteridge (see below for description of this new species), but M. gracilis is unlikely to be confused with that species because of the chartaceous, narrowly elliptic leaves which dry green (M. malayana has coriaceous, narrowly oblong leaves which dry brown), and the umbellate inflorescence (racemose in M. malayana).

    Images

    Distribution

    Native to:

    Malaya, Sumatera, Thailand

    Medusanthera gracilis (King) Sleumer appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1968 Dr. King's Collector [5662], Peninsular Malaysia K000271666
    Jan 1, 1968 Dr. King's Collector [5662], Peninsular Malaysia K000271667

    First published in Blumea 17: 226 (1969)

    Accepted by

    • Utteridge, T.M.A. (2011). A revision of the genus Medusanthera (Stemonuraceae, Icacinaceae s.l.) Kew Bulletin 66: 49-81. Royal Botanic Gardens, Kew.
    • Turner, I.M. (1995). A catalogue of the Vascular Plants of Malaya Gardens' Bulletin Singapore 47(1): 1-346.
    • Van Steenis, C.G.G.J. (ed.) (1971-1976). Flora Malesiana 7: 1-876. Noordhoff-Kolff N.V., Djakarta.
    • Smitinand, T. & Larsen, K. (eds.) (1970-1975). Flora of Thailand 2: 1-484. The Forest Herbarium, Royal Forest Department.
    • Sleumer, H. (1969). Materials towards the knowledge of the Icacinaceae of Asia, Malesia, and ajacent areas Blumea 17: 181-264.

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    Kew Backbone Distributions
    • Utteridge, T.M.A. (2011). A revision of the genus Medusanthera (Stemonuraceae, Icacinaceae s.l.) Kew Bulletin 66: 49-81. Royal Botanic Gardens, Kew.

    Sources

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. 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 2020. 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