Ottelia ulvifolia (Planch.) Walp.
  • Ann. Bot. Syst.


Cite taxon page as 'WFO (2020): Ottelia ulvifolia (Planch.) Walp. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-0000769669. Accessed on: 29 Nov 2020'

Morphology

A submerged aquatic

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    Flowers just above water-level, yellow or white (dried specimens always appear to be yellow).

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    Leaves often purple-tinged

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    Flowers 1 per spathe.

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    Sepals linear to linear-lanceolate or linear-oblong, 0.65–1.37(–2) cm. long, 1.6–5.3 mm. wide, acute to obtuse, whitish or green, often with brown longitudinal striations, the margins hyaline.

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    Petals obovate, 1.2–2.3(–3) cm. long, 0.8–1 cm. wide, rounded or somewhat truncate, white, white with yellow base, or yellow.

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    Stamens 3–6; anthers 1.5–2.3 (–3) mm. long, yellow; filaments up to 6.5 mm. long.

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    Ovary of 3–6 carpels, narrowly ellipsoid, 1–1.8 cm. long 0.3–0.4 cm. wide; perianth-tube up to 0.7 cm. long; styles 3–6; stigmas 6–12, up to 20 mm. long, yellowish.

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    Stems erect, corm-like, simple or rarely forked.

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    Fruit narrowly ellipsoid to ovoid or cylindric, 2–4 cm. long, 1–1.3 cm. wide, green, opening by decay of the pericarp.

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    Hermaphrodite, annual, rarely perennial.

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    Fig. 6.

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    Juvenile leaves not seen.

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    Seeds narrowly cylindric, 2.1–2.5 mm. long, 0.5–0.7 mm. wide, dark brown.

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    Mature leaves petiolate; blade submerged or floating, linear-elliptic to ovate-elliptic, 8–45 cm. long, 0.9–11.5 cm. wide, acute to obtuse, cuneate at base, smooth, light to mid-green, with 5–13 prominent longitudinal veins connected by cross-veins, together with many smaller longitudinal veins; margins entire; petiole 6.2–100 cm. long, 0.2–0.8 cm. wide.

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    Nodal scales not seen.

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    Spathe: peduncle 4.2–60 cm. long, 0.3–0.7 cm. wide; body of spathe submerged, not or slightly inflated, linear-oblong, elliptic, ovate or urceolate, 2–5.6(–6) cm. long, 0.4–2.7(–2.8) cm. wide, 2–6-lobed at the apex, with 0–2 wings and several longitudinal ribs or veins, green, somewhat translucent.

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    Aquatic herb. Leaves all submerged, lanceolate, tapered at base, margin entire, undulate. Monoecious. Flowers bisexual. Flowers yellow or cream.

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    Monoecious. Leaves all submerged, in rosettes, crowded, radical or on petioles, thin but firm, variable in size and shape, linear-lanceolate to ovate-lanceolate, up to 23 cm long and 5 cm broad, attenuate above and below, margin wavy, entire or sparsely denticulate. Inflorescence on a peduncle which is triangular in cross-section, up to 23 cm long and 3 mm in diam.; spathes saccate, compressed, narrow-ovate in outline, becoming much broader in fruit, up to 4 cm long and 2 cm broad, green with brownish nerves, narrowly winged, orifice with a few irregular small teeth; flowers bisexual; perianth-tube just exserted from spathe, outer segments linear-oblong, 8 mm long and 2 mm broad, green, inner obovate, 25 mm long and 9 mm broad, yellow or cream, with a small gland at the base; stamens 6, filaments flattened, 4 mm long, anthers small; ovary 17 mm long and 4 mm broad, placentas 6, unequal, styles 6 with 2 short stigmaticrarms. Fruit enclosed in the spathe, seeds small, cylindrical, covered with fine white hairs.

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    Ecology

    In muddy pools

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    Habitat

    Dams, rivers, streams, pools.

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    Distribution

    Recorded from the warmer parts of the Transvaal and northern South West Africa. Widespread in subtropical and tropical Africa.

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      Bibliography

     Information From

    e-Flora of South Africa
    e-Flora of South Africa. v1.21. 2018. South African National Biodiversity Institute. http://ipt.sanbi.org.za/iptsanbi/resource?r=flora_descriptions&v=1.21
    • A All Rights Reserved
    Hydrocharitaceae
    World Flora Online Data. 2017.
    • B CC0 1.0 Universal (CC0 1.0).
    Plants Of the World Online Portal - FTEA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • C
    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • D The Trustees of the Royal Botanic Gardens, Kew
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • E CC0 1.0 Universal (CC0 1.0).
    International Union for Conservation of Nature v.3
    https://www.iucnredlist.org/
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • F See IUCN Terms and conditions of use http://www.iucnredlist.org/info/terms-of-use
    International Union for Conservation of Nature
    https://www.iucn.org/
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • G All Rights Reserved