1. Family: Araceae Juss.
    1. Genus: Amorphophallus Blume ex Decne.
      1. Amorphophallus operculatus Hett. & Sizemore

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

    [CATE]

    CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

    Distribution

    Peninsular Thailand: Chumpon. Endemic.

    General Description

    Tuber elongate, thin, vertically rhizomatous, branching, 3–46 × 0.5–4 cm. Leaf solitary; petiole 10–65 cm × 4–15 mm, smooth, uniformly olive-green to dark rich reddish, sometimes with a few small, dark spots near the base; leaf blade moderately or highly dissected, 20–70 cm, rachises winged throughout; leaflets elongate ovate to ovate-lanceolate, 2–14 × 1–5 cm, apex acute-acuminate, fleshy, adaxially rich dark emerald green, margin reddish, abaxially dark greyish green, often flushed dark purple-violet, rachises on the abaxial surface rich dark reddish purple; peduncle 33–50 cm × 6–8 mm, smooth, dull reddish mauve with or without a few darker, irregular indistinct spots at the base; spathe broadly triangular-elliptic, 8–12 × 6–11 cm, margins concave, base and limb hardly separated, base convolute, ca half the length of the spathe, not opening to the base during staminate anthesis, apex acute, exterior whitish changing to pale dirty greyish whitish near the base, veins pale pinkish, upper half suffused with a pale pinkish purplish hue, interior dirty whitish, apex with a pinkish purplish hue, base within densely clothed with mostly globose verrucae, those on the dorsal side and close to the spadix base elongate and/or slightly rugate, the entire inner surface of the base covered with a wet film; spadix sessile, longer than spathe, 10–14.5 cm long; pistillate flower zone cylindrical, 8–10 × 8–11 mm, flowers congested; ovaries subglobose, 2 × 1.8–2 mm, pale green; style elongate conical, 0.8–1.1 × 0.8 mm at the base, 0.5 mm at the apex, pale purple or pale green flushed pale purple; stigma depressed, ca.1–1.2 × 0.5 mm high, with a shallow irregular central depression, surface verruculate, off-white; staminate flower zone elongate, slightly conical, base constricted, apex slightly or more distinctly laterally compressed, 3.5–4.8 cm × 8–14 mm, flowers congested; staminate flowers 4–5-androus, the lower flowers with only 1–2 stamens; stamens 1–1.2 × 0.8–1 mm; anthers 0.5–0.7 mm long, truncate, pores apical, slightly elongate, those of the more isolated lower anthers lunate to entirely ring-like around the upper rim of the anther, the anther then seemingly operculate; appendix elongate conical, thin–walled, 5–8.2 cm × 9–15 mm at the base, terete or slightly laterally compressed, more distinctly near the base, apex acute, surface slightly and shallowly rugose, off-white. Fruiting peduncle as flowering peduncle, no elongation. Infructescence globose, 3 × 3 cm; fruit lageniform, sometimes slightly asymmetrical, 10–13 × 4–6 mm, apex knob-like and separated slightly from the main body of the berry by an indistinct constriction, ripening white.

    Tuber elongate, thin, vertically rhizomatous, branching, to 40 cm long, 1-4 cm in diam. at the top; petiole 10-65 cm long, 0.4-1.5 cm in diam., smooth, uniformly olive green to dark rich reddish green, sometimes with a few small, dark spots near the base; lamina moderately or highly dissected, 20-70 cm in diam., rachises winged throughout; leaflets elongate ovate to ovate-lanceolate, top acute-acuminate, 2-14 cm long, 1-5 cm in diam., fleshy, upper surface a rich dark emerald green, margin reddish, lower surface dark greyish green, often flushed dark purple-violet, rachises on the lower side rich dark reddish purple. Peduncle 33-50 cm long, 6-8 mm in diam., smooth, dull reddish mauve with or without a few darker, irregular indistinct spots at the base. Spathe broadly triangular-elliptic, 8-12 cm in long., 6-11 cm in diam., margins concave, base and limb hardly separated, base convolute, ca. half the length of the spathe, not opening to the base during male anthesis, top acute, outside whitish changing to pale dirty greyish-white near the base, veins pale pinkish, upper half suffused with a pale pinkish-purplish hue, inside dirty whitish, top with a pinkish-purplish hue, base within densely clothed with mostly more or less globose verrucae, those on the dorsal side and close to the spadix base elongate and/or slightly rugate, the entire inner surface of the base covered with a wet film. Spadix sessile, longer than spathe, 10-14.5 cm long; female zone cylindric, 0.8-1 cm long, 0.8-1.1 cm in diam., flowers congested; male zone elongate, slightly conical, base constricted, top slightly or more distinctly laterally compressed, 3.5-4.8 cm long, 0.8-1.4 cm in diam. at the base, 0.5-1.2 cm in diam. at the top, flowers congested; appendix elongate conical, thin-walled, 5-8.2 cm long, 0.9-1.5 cm in diam. at the base, terete or slightly laterally compressed, more distinctly near the base, top acute, surface slightly and shallowly rugose, off-white. Ovaries subglobose, 2 mm in diam., 1.8-2 mm long, pale green, unilocular; style elongate conical, 0.8-1.1 mm long, 0.8 mm in diam. at the base, 0.5 mm at the top, pale purple or pale green flushed pale purple; stigma depressed, 1-l.2 mm in diam., ca. 0.5 111m high, with a shallow irregular central depression, surface verruculate, off-white. Male flowers having mostly 4-5 stamens, the lower flowers with only 1-2 stamens; stamens 1-l.2 mm long, 0.8-1 mm in diam.; filaments ca. 0.5 mm long, connate, whitish; anthers 0.5-0.7 mm long, truncate, pores apical, slightly elongate, those of the more isolated lower anthers lunate to entirely ring-like around the upper rim of the anther, the anther then seemingly operculate.

    Habitat

    Not recorded.

    Distribution

    Native to:

    Thailand

    Amorphophallus operculatus Hett. & Sizemore appears in other Kew resources:

    First published in Aroideana 26: 113 (2003)

    Accepted by

    • Boyce, P.C., Sookchaloem, D., Hetterscheid, W.L.A., Gusman, G., Jacobsen, N., Idei, T. & Nguyen, V.D. (2012). Flora of Thailand 11(2): 101-325. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.
    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

    Literature

    CATE Araceae
    • Hetterscheid, W.L.A. Notes on the Genus Amorphophallus 12: Three New Species from Tropical Asia. Aroideana; Journal of the International Aroid Society 26, 119 (2003).

    Sources

    CATE Araceae
    Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
    http://creativecommons.org/licenses/by-nc-sa/3.0

    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 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