1. Family: Urticaceae Juss.
    1. Genus: Pilea Lindl.
      1. Pilea johnstonii Oliv.

        This species is accepted, and its native range is SE. Ethiopia to E. Zimbabwe.

    [FZ]

    Urticaceae, I. Friis. Flora Zambesiaca 9:6. 1991

    Habit
    Perennial herbs with short, creeping rhizomes and erect unbranched or little branched juicy stems up to 0.4 m. tall, monoecious.
    Leaves
    Leaves of a pair subequal, 2–6 x 1.5–4.5 cm., broadly ovate to ovate-lanceolate; apex acuminate; base cuneate, obtuse, truncate or rounded, rarely subcordate; margin coarsely serrate, with 7–15(24) teeth on each side, lamina upper surface with scattered stiff hairs and linear cystoliths, lower surface glabrous to densely pubescent, especially on the nerves.
    Petiole
    Petiole 0.3–5(10) cm. long, usually pubescent.
    Stipules
    Stipules brown, membranous, up to 5(8) mm. long, broadly ovate, with a rounded or cordate base, persisting.
    Inflorescences
    Inflorescences axillary, with up to 4 inflorescences at each node, flowers arranged in pedunculate heads or interrupted spikes, with 2–6 globular heads along the axis of each spike, or with a branched inflorescence axis. Male heads up to 8( 12) mm. in diam. on peduncles up to 6 cm. long; male flowers on pedicels up to 2 mm. long, 4-merous, with apiculate tepals (sometimes developed into horn-like appendages). Female heads up to 6 mm. in diam., subsessile or on peduncles up to 5 cm. long; female flowers on pedicels 1–2 mm. long, 3-merous, tepals with appendages as in the male flowers, middle tepal lanceolate, up to 3 mm. long, lateral tepals shorter.
    Male
    Male heads up to 8( 12) mm. in diam. on peduncles up to 6 cm. long; male flowers on pedicels up to 2 mm. long, 4-merous, with apiculate tepals (sometimes developed into horn-like appendages).
    Female
    Female heads up to 6 mm. in diam., subsessile or on peduncles up to 5 cm. long; female flowers on pedicels 1–2 mm. long, 3-merous, tepals with appendages as in the male flowers, middle tepal lanceolate, up to 3 mm. long, lateral tepals shorter.
    Fruits
    Achene compressed ovoid, lanceolate, smooth, shiny, brown, up to 2 mm. long.
    [FTEA]

    Urticaceae, I. Friis University of Copenhagen, Denmark. Flora of Tropical East Africa. 1989

    Habit
    Perennial herb with prostrate and ascending stems, up to 0.6 m. high.
    Stem
    Stems juicy, glabrous.
    Leaves
    Leaves of a pair subequal; stipules ovate or triangular, prominent, brown, membranous, (1.5–)3–7.5(–8.5) mm. long, 0.8–4 mm. wide, base subcordate, apex rounded; petioles 0.3–8(–10) cm. long, glabrous or with a few scattered spreading hairs near the connection with lamina; lamina broadly ovate to ovate, rarely elliptic or lanceolate, (1–)1.5–8.5(–12.5) cm. long, (0.8–)l–7.5(–8.5) cm. wide, base cuneate, truncate or subcordate, margin serrate, with 6–24 teeth on each side, apex short-acuminate; lateral nerves 4–10, basal pair reaching 4th–7th(–10th) tooth from the apex; glabrous on both surfaces or with spreading hairs on the nerves on the lower surface, upper surface with regularly arranged linear cystoliths, lower surface sometimes with clearly marked hydatodes.
    Inflorescences
    Male inflorescences (heads) 5–12 mm. in diameter, on peduncles 0.8–6 cm. long; ♀ inflorescences (heads) subsessile or on peduncles 1–5 cm. long, 4–10 mm. in diameter. Inflorescences usually 2 together in the upper leaf-axils, always consisting of a ± pedunculate corymbose head, but sometimes with 2 side-branches below the head, rarely with repeated further branching under each head and up to 7 heads on each peduncle.
    Male
    Male flowers on pedicels 0.8–2 mm. long; perianth ± 1 mm. in diameter, 4-merous; tepals with up to 0.5 mm. long subapical appendages.
    Flowers
    Female flowers subsessile; perianth 0.8(–l) mm. long, middle lobes the largest, with subapical appendage. Male flowers on pedicels 0.8–2 mm. long; perianth ± 1 mm. in diameter, 4-merous; tepals with up to 0.5 mm. long subapical appendages.
    Female
    Female flowers subsessile; perianth 0.8(–l) mm. long, middle lobes the largest, with subapical appendage.
    Fruits
    Achene ovoid 0.8–1 mm. long, often with a ± marked flattened edge.

    Images

    Distribution

    Native to:

    Ethiopia, Kenya, Malawi, Sudan, Tanzania, Uganda, Zaïre, Zimbabwe

    Pilea johnstonii Oliv. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Tweedie, E.M. [3332], Kenya 30353.000
    Tweedie, E.M. [3316], Kenya 30773.000
    Polhill, R.M. [1628], Tanzania 31107.000
    Johnston, H. [s.n.], Tanzania K000242918 Unknown type material

    First published in Trans. Linn. Soc. London, Bot. 2: 349 (1887)

    Accepted by

    • Darbyshire, I., Kordofani, M., Farag, I., Candiga, R. & Pickering, H. (eds.) (2015). The Plants of Sudan and South Sudan: 1-400. Kew publishing, Royal Botanic Gardens, Kew.
    • Launert, E. & Cope, G.V. (eds.) (1991). Flora Zambesiaca 9(6): 1-135. Royal Botanic Gardens, Kew.
    • Hedberg, I. & Edwards, S. (eds.) (1989 publ. 1990). Flora of Ethiopia and Eritrea 3: 1-659. The National Herbarium, Addis Ababa University, Ethiopia & The Department of Systematic Botany, Upps.
    • Friis, I. (1989). Flora of Tropical East Africa, Urticaceae: 1-64.
    • Robyns, W. & al. (eds.) (1948-1963). Flore du Congo Belge et du Ruanda-Urundi 1-10.

    Literature

    Kew Backbone Distributions
    • Fischer, E., Rembold, K., Althof, A. & Obholzer, J. (2010). Annotated checklist of the vascular plants of Kakamega forest, Western province, Kenya Journal of East African Natural History 99: 129-226.
    Flora of Tropical East Africa
    • A.D.Q. Agnew, Upland Kenya Wild Flowers p. 323 (1974).
    • Hauman in Flore du Congo Belge et du Ruanda-Urundi, 1: 200 (1948).
    • Rendle in Flora of Tropical Africa 6(2): 273 (1917).
    • Oliv. in Trans. Linn. Soc., Bot, ser. 2, 2: 349 (1887).

    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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. 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 2020. 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