1. Family: Araceae Juss.
    1. Genus: Apoballis Schott
      1. Apoballis okadae (M.Hotta) S.Y.Wong & P.C.Boyce

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

    [CATE]

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

    Diagnostic
    This species is very variable in size, apparently according to microhabitat — plants established on boulders generally reach and flower at the smallest dimensions, while those established in sand and gravel may be much more robust and then generally with relatively much wider leaf blades.
    Habitat
    Rheophytic on rocks or in sand and gravel by streams, often forming large colonies in well illuminated conditions by branching of the decumbent and creeping stems; found over a variety of substrates including limestone and sandstone,
    General Description
    Small to moderately robust rheophytic herb c. 15–40 cm tall. Stem creeping to decumbent, with internodes to 1–4 cm long, 1–3 cm thick. Leaves several along the stem; petiole generally longer than the blade, 5–40 cm long, sheathing in the lower 2⁄5–3⁄5; wings of sheath fully attached (later tending to degrade) and tapering; blade oblanceolate to ovate, 7–26 cm long × 2–10 cm wide, the base acute to shallowly cordate, sometimes markedly asymmetric, the tip acuminate for 1–3 cm; midrib and primary veins tough and abaxially prominent; primary lateral veins 3–9 on each side of the midrib, irregularly alternating with interprimaries ill-differentiated from the secondary venation, diverging at c. 30°; secondary venation mostly arising from the midrib, some from near the bases of the primary veins in the lower part of the leaf; tertiary venation obscure. Inflorescence solitary; peduncle more or less half the length of the petiole at anthesis (later elongating). Spathe green, 5–8 cm long; lower spathe narrowly ovoid to ovoid, 2–3 cm long, differentiated from the limb by a weak constriction; limb oblong-lanceolate, shortly acuminate, 3–5.5 cm long, whitish, persistent after anthesis, finally deciduous. Spadix shortly stipitate, 3–3.5 cm long; female zone and stipe obliquely inserted to partly adnate to the spathe in the basal ¼; female zone 1–1.5 cm long, subcylindric, c. 2 mm diam. (dry); pistils crowded (distally more lax), oblong-subglobose, c. 0.5 mm diam.; stigma sessile, discoid, slightly narrower than the ovary; interpistillar staminodes absent from among the pistils, a few or an incomplete whorl at the base of the female zone, more or less globose, sessile, slightly larger than the pistils; sterile interstice 5–8 mm long, within and reaching the mouth of the lower spathe chamber, naked except for scattered small groups of sessile staminodes smaller than the basal ones, c. 0.3 mm diam.; male zone more or less cylindric-fusiform, c. 1.2–2 cm long × 3–5 mm thick; stamens crowded, truncate with the connective thick but not elevated between the thecae, c. 0.6 mm across; appendix shorter than and basally isodiametric with the male zone, c. 5 mm long, apically acute; staminodes of the appendix flat-topped, irregularly polygonal, c. 0.7 mm diam. Fruiting spathe urceolate becoming pyriform, c. 3–4 cm long.
    Distribution
    Malesia: endemic to Sumatera (widespread but scattered in Aceh, North Sumatera and West Sumatera).
    [CATE]

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

    Distribution

    Malesia: endemic to Sumatera (widespread but scattered in Aceh, North Sumatera and West Sumatera).

    General Description

    Small to moderately robust rheophytic herb c. 15-40 cm tall. Stem creeping to decumbent, with internodes to 1-4 cm long, 1-3 cm thick. Leaves several along the stem; petiole generally longer than the blade, 5-40 cm long, sheathing in the lower 2/5-3/5; wings of sheath fully attached (later tending to degrade) and tapering; blade oblanceolate to ovate, 7-26 cm long × 2-10 cm wide, the base acute to shallowly cordate, sometimes markedly asymmetric, the tip acuminate for 1-3 cm; midrib and primary veins tough and abaxially prominent; primary lateral veins 3-9 on each side of the midrib, irregularly alternating with interprimaries ill-differentiated from the secondary venation, diverging at c. 30°; secondary venation mostly arising from the midrib, some from near the bases of the primary veins in the lower part of the leaf; tertiary venation obscure. Inflorescence solitary; peduncle more or less half the length of the petiole at anthesis (later elongating). Spathe green, 5-8 cm long; lower spathe narrowly ovoid to ovoid, 2-3 cm long, differentiated from the limb by a weak constriction; limb oblong-lanceolate, shortly acuminate, 3-5.5 cm long, whitish, persistent after anthesis, finally deciduous. Spadix shortly stipitate, 3-3.5 cm long; female zone and stipe obliquely inserted to partly adnate to the spathe in the basal 1/4; female zone 1-1.5 cm long, subcylindric, c. 2 mm diam. (dry); pistils crowded (distally more lax), oblong-subglobose, c. 0.5 mm diam.; stigma sessile, discoid, slightly narrower than the ovary; interpistillar staminodes absent from among the pistils, a few or an incomplete whorl at the base of the female zone, more or less globose, sessile, slightly larger than the pistils; sterile interstice 5-8 mm long, within and reaching the mouth of the lower spathe chamber, naked except for scattered small groups of sessile staminodes smaller than the basal ones, c. 0.3 mm diam.; male zone more or less cylindric-fusiform, c. 1.2-2 cm long × 3-5 mm thick; stamens crowded, truncate with the connective thick but not elevated between the thecae, c. 0.6 mm across; appendix shorter than and basally isodiametric with the male zone, c. 5 mm long, apically acute; staminodes of the appendix flat-topped, irregularly polygonal, c. 0.7 mm diam. Fruiting spathe urceolate becoming pyriform, c. 3-4 cm long.

    Habitat

    Rheophytic on rocks or in sand and gravel by streams, often forming large colonies in well illuminated conditions by branching of the decumbent and creeping stems; found over a variety of substrates including limestone and sandstone, 50-400 m alt.

    Distribution

    Native to:

    Sumatera

    Apoballis okadae (M.Hotta) S.Y.Wong & P.C.Boyce appears in other Kew resources:

    First published in Bot. Stud. (Taipei) 51: 254 (2010)

    Accepted by

    • 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
    • Hay, A. & Yuzammi 2000. Schismatoglottideae (Araceae) in Malesia: 1. Schismatoglottis. Telopea. 9 (1): 1-177

    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