Rytigynia orbicularis (K.Schum.) Robyns

First published in Bull. Jard. Bot. État Bruxelles 11: 151 (1928)
This species is accepted
The native range of this species is DR Congo to Angola and Zambia. It is a shrub and grows primarily in the seasonally dry tropical biome.

Descriptions

Rubiaceae, D. Bridson. Flora Zambesiaca 5:2. 1998

Morphology General Habit
Glabrous subshrub or shrub 0.6–1.2 m tall, with rather slender somewhat glaucous much branched stems with reddish-brown eventually somewhat flaking bark.
Morphology Leaves
Leaves sometimes folded and curved downward, glaucous or blue-green, 1.2–5 × 0.8–4 cm, ovate to round, or elliptic, mostly shortly acutely acuminate at the apex but sometimes rounded or even slightly emarginate, rounded to usually distinctly cordate at the base, glaucous; petiole 1–5 mm long; stipular sheath c. 1 mm long, with a subulate thickish appendage 1–2.5 mm long.
Morphology Reproductive morphology Flowers
Flowers solitary; peduncle 5–10 mm long; pedicels 5–8 mm long; bracts 2, minute, scarcely 1 mm long, lanceolate.
Morphology Reproductive morphology Flowers Calyx
Calyx tube 1–2 mm long, obconic, the limb 0.5–0.75 mm long undulate or shallowly toothed.
Morphology Reproductive morphology Flowers Corolla
Corolla apiculate in bud; greenish-white or yellowish, the lobes often a more distinct yellow; tube 4–6 mm long, funnel-shaped, with a ring of deflexed hairs below the throat inside; lobes triangular-lanceolate, 4–5 × 2 mm at the base, including the very short appendages.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma exserted about 1 mm.
Morphology Reproductive morphology Flowers Pollen presenter
Pollen presenter 1.5 mm long, ellipsoid, later subcoroniform, strongly 3-lobed at the apex.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 3-locular.
Morphology Reproductive morphology Fruits
Fruit up to 8 × 10 mm with 1–3 pyrenes; pyrenes c. 8 mm long, deeply lobed in dry state.
[FZ]

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]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • 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 Vascular Plants 2025. 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 2025. 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