1. Family: Balsaminaceae A.Rich.
    1. Genus: Impatiens Riv. ex L.
      1. Impatiens usambarensis Grey-Wilson

        This species is accepted, and its native range is Tanzania (W. Usambara Mountains).

    [FTEA]

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

    Habit
    Rather robust perennial to 2 m. tall, though generally less; stems often reddish, sparingly branched or simple, glabrous or with a few hairs when young, but then soon glabrescent.
    Leaves
    Leaves spirally arranged; petiole 2.3–6.8 cm. long, slender, with a number of 2–4 mm. long stipitate glands (extra-floral nectaries) crowded at the top; lamina narrowly ovate or oblong to oblong-elliptical, (2.5–)5–18.5 cm. long, (2–)2.5– 5.2 cm. broad, the base attenuate, the apex acute to acuminate, sparsely pubescent above but rather densely so beneath, especially along the midrib and lateral veins; margin serrulate or serrulate-denticulate; lateral veins (8–)9–14 pairs.
    Inflorescences
    Inflorescence (1–)2(–3)-flowered, the flowers pink to deep red or vermillion.
    Peduncles
    Peduncle 3–9 cm. long, slender, glabrous or somewhat pubescent.
    Bracts
    Bracts linear-lanceolate, 4–7 mm. long, acute.
    Pedicel
    Pedicels 2–3.5 cm. long, slender.
    Calyx
    Lower sepal narrowly navicular, 15–19 mm. long, abruptly constricted into a 27–41 mm. long curved filiform spur which is slightly thickened at the tip. Lateral sepals 2, narrowly lanceolate, 4–7 mm. long, acute.
    Corolla
    Dorsal petal suborbicular to obcordate, 22–26 mm. long, 26–30 mm. broad, dorsally with a narrow crest terminating in a short acute point. Lateral united petals (20–)24–30 mm. long; upper petal of each pair suborbicular to obovate, 22–28 mm. long, 14–23 mm. broad, entire or slightly emarginate; lower petal of each pair similar in shape to the upper, 23–28 mm. long, 13–21 mm. broad, entire or slightly emarginate.
    Ovary
    Ovary glabrous.
    Fruits
    Fruit fusiform, 17–22 mm. long, glabrous.
    Habitat
    Rain-forest and forest patches, usually in deep shade, especially along pathways and streams; 850–2100 m.
    Distribution
    not known elsewhere T3

    Distribution

    Native to:

    Tanzania

    Impatiens usambarensis Grey-Wilson appears in other Kew resources:

    First published in Kew Bull. 33: 649 (1979)

    Accepted by

    • Grey-Wilson, C. (1982). Flora of Tropical East Africa, Balsaminaceae: 1-76.

    Literature

    Kew Backbone Distributions
    • Grey-Wilson, C. (1982). Flora of Tropical East Africa, Balsaminaceae: 1-76.
    Flora of Tropical East Africa
    • Grey-Wilson in Impat. Afr.: 79, figs. 19, 20a, pls. 1, 2 (1980).
    • Grey-Wilson in Kew Bulletin 33: 649 (1979)

    Sources

    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