Vitaceae
Cissus

Cissus humbertii Robyns & Lawalrée

First published in Bull. Jard. Bot. État Bruxelles 18: 271 (1947)
This species is accepted
The native range of this species is E. DR Congo to SW. Kenya. It is a climbing shrub and grows primarily in the wet tropical biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/103646835/103646870

Conservation
VU - vulnerable
[IUCN]

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Vitaceae, Bernard Verdcourt. Flora of Tropical East Africa. 1993

Morphology General Habit
Woody liane 2–3(–10) m. long; stems dark, ± 4-angled, striate, glabrous; tendrils present, bifid.
Morphology Leaves
Leaves elliptic, oblong-elliptic or ovate–oblong, 4–11 (–16) cm. long, 2–6.5(– 8.5) cm. wide, shortly to distinctly acuminate at the apex and acute at extreme tip, very broadly cuneate at the base, margins acutely ± distantly antrorsely denticulate with the teeth narrow, or sometimes with larger spreading teeth, 3–5-nerved at base of lamina, reticulately venose and glabrous above, usually with pubescent domatia in nerve-axils beneath; petiole slender, 0.8–4 cm. long, shiny; stipules ovate, 2.5–3 mm. long, 2–3 mm. wide, thin, glabrous but erose at margin, deciduous.
Morphology Reproductive morphology Inflorescences
Cymes leaf-opposed, 3.5–5 cm. long and wide, each umbelliform element 3–5-flowered; peduncles 1.5–2.2 cm. long; pedicels slender, 2–4 mm. long, becoming 6(–?10) mm. in fruit; bracts and bracteoles triangular, 1.5 mm. long, 1 mm. wide.
Morphology General Buds
Buds ovoid or subcylindrical, 1.5–3 mm. long, rounded at the apex, glabrous.
Morphology Reproductive morphology Flowers Calyx
Calyx cupular, 0.5 mm. long, with 4 rounded lobes, glabrous.
Morphology Reproductive morphology Flowers Corolla
Petals greenish or pale yellow, ovate, 2 mm. long, 1 mm. wide.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 1 mm. long, glabrous.
Morphology Reproductive morphology Fruits
Fruits obovoid or ellipsoid, 7.5–9 mm. long, 7 mm. wide, glabrous.
Morphology Reproductive morphology Seeds
Seeds dark reddish brown, ovoid, 7–8 mm. long, 5–6 mm. wide, narrowed at point of attachment, median flat ridge on one side and fine depressed median line on the other, the rest of the surface rugulose (brain-like) (or tuberculate fide Dewit).
Habitat
Forest and forest patch near lakeside; 1500–1700 (–2460 in Rwanda) m.
Distribution
K5 U2
[FTEA]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0