1. Family: Santalaceae R.Br.
    1. Genus: Thesium L.
      1. Thesium helodes Hilliard

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

    [FZ]

    Flora Zambesiaca. Vol. 9, Part 3. Polygonaceae-Myriaceae. Pope GV, Polhill RM, Martins ES. 2006.

    Type
    Type:Zimbabwe, Rusape, fl. & fr., Hislop 218 (K, holotype).
    Flowers
    Flowers few to many in long lax spikes sometimes terminating in a very slender bracteate (but sterile?) apex, rarely a filiform scaly shoot developing immediately below a flower and much overtopping it Flowers few to many in long lax spikes sometimes terminating in a very slender bracteate (but sterile?) apex, rarely a filiform scaly shoot developing immediately below a flower and much overtopping it.
    Bracts
    Bracts 1.5–2 × 0.8–1.3 mm; bracteoles 2, often larger, 1.8–3.2 × 1.2–1.8 mm, ovate-cuspidate, thick-textured, margins membranous, erose-ciliolate Bracts 1.5–2 × 0.8–1.3 mm; bracteoles 2, often larger, 1.8–3.2 × 1.2–1.8 mm, ovate-cuspidate, thick-textured, margins membranous, erose-ciliolate.
    Style
    Style 3.2–3.6 mm long
    Ecology
    Marshes.
    Note
    Thesium helodes is easily recognized by the combination of slender stolons and delicate “leafless” stems terminating in long lax spikes of flowers in which the margins of the perianth lobes are erose-fimbriate.
    Distribution
    ZIM N, ZIM C Zimbabwe May occur in the S: division as well: Kappyne in GHS 266154 from Makaholi (Makoholi) Experimental Station c. 25 km north of Masvingo (Fort Victoria) is completely sterile but may be T. helodes. Known only from Zimbabwe.
    Habit
    Perennial herb with slender stolons c. 1 mm in diameter and a few distant very short scaly vegetative buds that eventually develop into stems; stems c. 150–300 mm long, c. 0.8–1 mm in diameter, ± erect, simple to very sparingly virgately branched in upper part, distinctly ribbed by decurrent leaves, distantly leafy. Perennial herb with slender stolons c. 1 mm in diameter and a few distant very short scaly vegetative buds that eventually develop into stems; stems c. 150–300 mm long, c. 0.8–1 mm in diameter, ± erect, simple to very sparingly virgately branched in upper part, distinctly ribbed by decurrent leaves, distantly leafy
    Leaves
    Leaves all reduced to scales c. 1–2 × 0.4–0.8 mm, lanceolate, acuminate, thick-textured, closely appressed. Leaves all reduced to scales c. 1–2 × 0.4–0.8 mm, lanceolate, acuminate, thick-textured, closely appressed
    Perianth
    Perianth “white”, tube 1.7–2 mm long, external glands conspicuous, ellipsoid, about half as long as tube, lobes 2–2.4 × 0.5–0.8 mm, oblong, obtuse, hood c. 0.25 mm long, margins inflexed, erose-fimbriate. Perianth “white”, tube 1.7–2 mm long, external glands conspicuous, ellipsoid, about half as long as tube, lobes 2–2.4 × 0.5–0.8 mm, oblong, obtuse, hood c. 0.25 mm long, margins inflexed, erose-fimbriate
    Stamens
    Stamens inserted near base of perianth lobes; filaments 1–1.3 mm long, conspicuous; anthers 0.5–0.7 mm long. Stamens inserted near base of perianth lobes; filaments 1–1.3 mm long, conspicuous; anthers 0.5–0.7 mm long
    Pistil
    Style 3.2–3.6 mm long.
    Fruits
    Fruit c. 2.5 × 1.8 mm, light reddish-brown, strongly ribbed and reticulate. Fruit c. 2.5 × 1.8 mm, light reddish-brown, strongly ribbed and reticulate.

    Images

    Distribution

    Native to:

    Zimbabwe

    Thesium helodes Hilliard appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 1989 Hislop, A. [s.n.], Zimbabwe K000431517 holotype

    First published in Edinburgh J. Bot. 48: 53 (1991)

    Accepted by

    • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.

    Literature

    Flora Zambesiaca
    • Edinb. J. Bot. 48: 53 (1991).
    Kew Backbone Distributions
    • Pope, G.V., Polhill, R.M. & Martins, E.S. (eds.) (2006). Flora Zambesiaca 9(3): 1-277. Royal Botanic Gardens, Kew.

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    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 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