1. Family: Balsaminaceae A.Rich.
    1. Genus: Impatiens Riv. ex L.
      1. Impatiens hydrogetonoides Launert

        This species is accepted, and its native range is SW. Tanzania to N. Zambia.

    [FZ]

    Balsaminaceae, E. Launert. Flora Zambesiaca 2:1. 1963

    Habit
    Soft erect or prostrate perennial (?) herb; stems up to 50 cm. high, glabrous or very sparsely pilose, succulent.
    Leaves
    Leaves spirally arranged, petiolate; lamina 6–11 × 2–4·5 cm., narrowly elliptic or ovate-lanceolate, apex acute to subobtuse, usually acuminate, margin crenulate-denticulate, base cuneate with some slender tentacle-like hairs on the margins, membranous, bright to medium green on the upper surface, greyish-green to glaucous on the lower one, sparsely pilose on the upper surface, less densely so or glabrous on the lower one; secondary nerves 6–9 pairs, somewhat prominent beneath; petiole up to 5 cm. long, slender, subcanaliculate.
    Flowers
    Flowers axillary, solitary, in pairs or clusters of 3, pink; bracts up to 5 × 1·25 mm., triangular, subulate, tapering to a very fine point, glabrous; pedicels up to 6 cm. long, slender, succulent, usually glabrous.
    Calyx
    Lateral sepals 5–7 × 3·75–4·25 mm., broadly ovate, acuminate and acute, with a subcordate base, glabrous; posterior sepal up to 13 mm. long and c. 2·5 mm. deep (excluding the spur), shallowly and obliquely navicular, ± abruptly constricted into the spur, distally caudate, glabrous (always?); spur up to 40 mm. long, slender, tapering towards the slightly thickened end, glabrous.
    Corolla
    Anterior petal c. 14 mm. long and c. 12 mm. broad when flattened, helmet-shaped, dorsally very narrowly cristate with the crest terminating in a sharp point, slightly cordate and broadly saccate at the base, glabrous (always?). Lateral pair of united petals c. 20 mm. long, deeply 2-lobed; lobes with the margins slightly overlapping, glabrous; anterior lobe c. 15 × 10 mm., transversely broadly semi-elliptic, distally rounded, with a distinct small ridge at the very base; posterior lobe c. 1/3 the size of the anterior one, broadly elliptic or obliquely obovate (broadest slightly above the middle), entire.
    Ovary
    Ovary glabrous.
    Fruits
    Capsule c. 14 mm. long, fusiform.
    Seeds
    Seeds numerous, c. 2 × 1·6 mm., broadly elliptic to oblong in outline, reddish-brown, finely tuberculate, glabrous.
    [FTEA]

    Balsaminaceae, C. Grey-Wilson. Flora of Tropical East Africa. 1993

    Habit
    Perennial herb up to 70 cm. tall, but usually less, often only 15 cm.; stems erect, usually solitary, arising from a crown supporting a number of thin tuberous, rather fleshy, roots, unbranched or with a few short lateral shoots.
    Leaves
    Leaves crowded towards the stem apices, spirally arranged; petiole 0.8–5.6 cm. long, slender; lamina lanceolate-elliptic to elliptic or oblanceolate, 2.8–13 cm. long, 1.4–7.5 cm. broad, attenuate at the base, the apex obtuse to long-acuminate, sparsely pubescent above, glabrous or sparsely pubescent on the veins beneath; lateral veins 3–8 pairs; margin crenate to crenate-serrate, generally with a few ± 1 mm. long fimbriae towards the base where the lamina runs along the petiole.
    Flowers
    Flowers in fascicles of 2–3, or solitary, ependunculate, pale pink to lilac or deep rose-purple, the upper petal of each lateral pair usually with a dark blotch towards the base.
    Bracts
    Bracts linear-subulate, 3–4 mm. long, inconspicuous.
    Pedicel
    Pedicels 2.9–7.8 cm. long, slender, glabrous or sparsely pubescent, deflexed in fruit.
    Calyx
    Lateral sepals ovate to lanceolate, 5–11 mm. long, 2.5–3.5 mm. broad, acuminate. Lower sepal obliquely and narrowly navicular, 8–14 mm. long, 3–5 mm. deep, abruptly constricted into a 18–25 mm. long curved filiform spur.
    Corolla
    Dorsal petal 11–13 mm. long, 12–19 mm. broad (when flattened), semi-cucullate, dorsally with a narrow crest terminating in a short acute point. Lateral united petals 18–27 mm. long, the upper petal of each pair about one-third the size of the lower; upper petal ovate-oblong, 6–13 mm. long, 4–19 mm. broad, usually apiculate; lower petal transversely ovate or semiorbicular, 12–17 mm. long, 9–14 mm. broad, with a slight emargination along the inner margin.
    Ovary
    Ovary glabrous.
    Fruits
    Immature fruit narrowly fusiform, ±11 mm. long and 4 mm. broad, glabrous.

    Distribution

    Impatiens hydrogetonoides Launert appears in other Kew resources:

    First published in Bol. Soc. Brot., sér. 2, 36: 54 (1962)

    Accepted by

    • Grey-Wilson, C. (1982). Flora of Tropical East Africa, Balsaminaceae: 1-76.
    • Exell, A.W., Fernandes, A. & Wild, H. (eds.) (1963). Flora Zambesiaca 2(1): 1-351. Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • Exell, A.W., Fernandes, A. & Wild, H. (eds.) (1963). Flora Zambesiaca 2(1): 1-351. Royal Botanic Gardens, Kew.
    Flora of Tropical East Africa
    • Grey-Wilson, Impat. Afr.: 133 (1980).
    • Launert in Flora Zambesiaca 2: 177 (1963).
    • Launert in Bol. Soc. Brot., sér. 2, 36: 54 (1962)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    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