1. Family: Melastomataceae Juss.
    1. Genus: Tristemma Juss.
      1. Tristemma mauritianum J.F.Gmel.

        This species is accepted, and its native range is Tropical Africa, Comoros, Madagascar.

    [FZ]

    Melastomataceae, R. and A. Fernandes. Flora Zambesiaca 4. 1978

    Habit
    An erect or climbing succulent perennial herb or a lax shrub up to 1·2(2·5) m. high, dark green, sometimes suffused reddish.
    Branches
    Branches sharply 4-angled or slightly 4-winged, with furrowed faces, sparsely strigose, with short stiff appressed purplish bristles, denser towards the apex.
    Leaves
    Leaf-lamina (4)7–15(22) x (2)3–8(13) cm., elliptic or ovate-elliptic, acute at the apex, cuneate or rarely roundish at the base, entire, membranous, dark green above, lighter beneath, ± strigose on both faces, the hairs short, appressed on the upper face, sparser and subappressed on the lower, longitudinally 5–7-nerved, these nerves rather slender, impressed above, prominent beneath, the transverse ones ± obliquely ascending, conspicuous mainly beneath; petiole 1·2–4(5) cm. long, furrowed above, strigose.
    Flowers
    Flowers numerous, in dense headed inflorescences; outer bracts completely foliaceous or with a foliaceous apex, acute, dorsally appressed-strigose, the inner ones subcircular to obovate, apiculate to obtuse, coriaceous to chaffy or scarious, glabrous.
    Receptacle
    Receptacle 6–9 x 4–5 mm., ovoid, with 1(2) rings of bristles on the upper part, the lower ring, when present, usually incomplete.
    Calyx
    Sepals 3·5–5 x2–3 mm., triangular, acute.
    Corolla
    Petals 6–10 mm. long, pale mauve or pink.
    Anthers
    Anthers 4–5 mm. long; pedoconnective 0·5–0·75 mm. with the basal appendage deeply 2-lobed, the lobes obtuse.
    Fruits
    Fructiferous receptacle 15–16 x 10–12 mm., purple or purplish-brown.
    [FTEA]

    Melastomataceae, G. E. Wickens. Flora of Tropical East Africa. 1975

    Habit
    Shrubby herb up to 2 m. high; branches 4-angled, shortly winged, hispid.
    Leaves
    Leaf-lamina elliptic to elliptic-ovate, up to 20 cm. long and 14.5 cm. wide, apex acute or acuminate, base attenuate to rounded, thinly strigose on both surfaces; nerves 5–7, impressed above, prominent beneath; venation subprominent beneath; petiole 1–4 cm. long.
    Inflorescences
    Inflorescence terminal; peduncle 2–4 mm. long; flowers ± 2–15; outer bracts leaf-like, slightly exceeding the flowers; inner bracts obovate, equalling the calyx-tube, coriaceous, glabrous except for the ciliate margins.
    Calyx
    Calyx-tube tubular-campanulate, 10–11 mm. long, 5–6 mm. in diameter, with 1–2(–5) complete annular rings of bristles, sometimes with an additional incomplete ring, or with 1–2 incomplete rings only; calyx-lobes triangular, 5–8 mm. long, 2.5–4 mm. wide, margins ciliate.
    Corolla
    Petals obovate, up to 15 mm. long, 12 mm. wide, pink to pale mauve.
    Stamens
    Stamens equal; anthers 3 mm. long; connective 0.2 mm. long with 2 anterior tubercles; filaments 3.5 mm. long.
    Pistil
    Ovary ovoid, ± 8 mm. long, apex setose; style up to 1.5 mm. long.
    Figures
    Fig. 6/1–11.
    Habitat
    Marshy clearings in rain-forest, swampy riverine forest; 775–1950 m.
    Distribution
    K5 K7 P T1 T3 T4 T6 T8 U1 U2 U3 U4 widespread in tropical Africa from Senegal eastwards to Ethiopia and southwards to Angola, Rhodesia and Mozambique
    [FZ]

    Melastomataceae, R. and A. Fernandes. Flora Zambesiaca 4. 1978

    Habit
    A perennial herb up to 2 m. high.
    Branches
    Branches 4-angled, sulcate on the faces, hairy, the hairs 2–5 mm. long, patent, reddish yellow, denser and longer at the nodes.
    Leaves
    Leaf-lamina up to 12·5 x 6 cm., elliptic or ovate-elliptic, acuminate, the acumen very acute, acute or roundish at the base, entire, membranous, dark green and somewhat densely subappressed-strigose above, yellow-greenish and sparsely strigose beneath, longitudinally 5–7-nerved, the nerves prominent and covered with long and subpatent hairs, the transverse ones arched; petiole 1–3 cm. long, furrowed above, ± densely and patently hairy.
    Flowers
    Flowers 4–12, in compact shortly pedunculate heads; outer bracts subfoliaceous, strigose on nerves and apex, the inner ones membranous, obovate, nearly glabrous.
    Receptacle
    Receptacle c. 8 x 4 mm., with 1–2 usually interrupted rings of bristles at the top.
    Calyx
    Sepals c. 8 x 4 mm., triangular, very acute.
    Corolla
    Petals c. 15 x 12 mm., obovate, blunt, lilac to blue-violet.
    Anthers
    Anthers 5–6·5 mm. long; pedoconnective c. 0·75 mm. long with the anterior basal appendage deeply lobed.
    Fruits
    Fructiferous receptacle c. 10 x 7·5 mm.

    Images

    Distribution

    Native to:

    Angola, Burkina, Cameroon, Central African Repu, Chad, Comoros, Congo, Equatorial Guinea, Ethiopia, Gabon, Gulf of Guinea Is., Kenya, Madagascar, Mozambique, Nigeria, Sudan, Tanzania, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Mauritius, Queensland, Réunion

    Tristemma mauritianum J.F.Gmel. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 2006 Cheek, M. [11582], Cameroon K000023186
    Jan 1, 2006 Etuge, M. [5268], Cameroon K000023185
    Oct 1, 2003 Lane, P. [294], Cameroon K000197831
    Oct 1, 2003 Cheek, M. [6065], Cameroon K000197835
    Oct 1, 2003 Cheek, M. [7077], Cameroon K000197836
    Oct 1, 2003 Cable, S. [2507], Cameroon K000197834
    Oct 1, 2003 Cable, S. [3851], Cameroon K000197840
    Oct 1, 2003 Cable, S. [3682], Cameroon K000197841
    Oct 1, 2003 Etuge, M. [2620], Cameroon K000197838
    Oct 1, 2003 Etuge, M. [2442], Cameroon K000197839
    Oct 1, 2003 Zapfack, L. [958], Cameroon K000197832
    Oct 1, 2003 Schoenenberger, J. [34], Cameroon K000197830
    Jan 1, 1988 Thompson, S.A. [1480], Cameroon K000050123
    Jan 1, 1977 Leeuwenberg, A.J.M. [8263], Cameroon K000050124
    Oct 1, 1974 Tamajong, S. [FHI 22119], Cameroon K000050130
    Angola K000313230
    Ash [1484], Ethiopia 35691.000
    Greenway [3683], Tanzania K000313231 isotype
    Kenfack, D. [248], Cameroon K000197837
    Senegal Tristemma incompletum K000312749
    Milne-Redhead, E. [3234], Zambia Tristemma incompletum 47018.000
    Jan 1, 1973 Smith [s.n.], Congo Tristemma virusanum K000312738 Unknown type material

    First published in Syst. Nat. ed. 13[bis] 2(1): 693 (1791)

    Accepted by

    • Roskov Y. & al. (eds.) (2018). Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

    Literature

    Flora of Tropical East Africa
    • J. F. Gmel., Syst. Pl. 2: 693 (1791).

    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 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