Rubiaceae
Rytigynia

Rytigynia nodulosa (K.Schum.) Robyns

First published in Bull. Jard. Bot. État Bruxelles 11: 155 (1928)
This species is accepted
The native range of this species is Tanzania (Uluguru Mountains). It is a shrub and grows primarily in the seasonally dry tropical biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/35486/9931179

Conservation
VU - vulnerable
[IUCN]

Rubiaceae, B. Verdcourt. Flora of Tropical East Africa. 1976

Morphology General Habit
Shrub 1–2 m. tall or branched tree 3–6 m. tall; stems grey or blackish grey, rugose; young shoots densely covered with short pale ferruginous pubescence; flowering shoots sometimes very short, corrugate and nodose.
Morphology Leaves
Leaf-blades narrowly ovate-elliptic, 0.8–5 cm. long, 0.4–2 cm. wide, acute to shortly acuminate at the apex, broadly cuneate at the base, discolorous, blackish above when dry, much paler beneath and densely pubescent on the midrib; petiole 1 mm. long, densely pubescent; stipules with pubescent triangular base 3 mm. long and subulate appendage 3–3.5 mm. long.
Morphology Reproductive morphology Inflorescences
Inflorescence 1–2(–3)-flowered; peduncle obsolete; pedicels 1–3 mm. long, ferruginous pubescent.
Morphology General Buds
Buds obtuse or shortly apiculate.
Morphology Reproductive morphology Flowers Calyx
Calyx-tube 1 mm. long; limb 1 mm. long, ± scarious, denticulate.
Morphology Reproductive morphology Flowers Corolla
Corolla greenish yellow, glabrous outside; tube ± cylindrical-urceolate, 6 mm. long, with a ring of deflexed hairs inside; lobes ovate, 2 mm. long, 1.5 mm. wide with very short appendages.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers 1.5 mm. long, half-exserted.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 5-locular; style ± 6 mm. long, the stigmatic club coroniform, 5-lobed.
Morphology Reproductive morphology Fruits
Fruit not seen.
Habitat
Mossy forest with tree-ferns etc., mist-forest; 1350–2100 m.
Distribution
T6 not known elsewhere
[FTEA]

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: threatened. Confidence: confident
[AERP]

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

    • '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/

  • 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 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