Rubiaceae
Tricalysia

Tricalysia allocalyx Robbr.

First published in Bull. Jard. Bot. Natl. Belg. 52: 334 (1982)
This species is accepted
The native range of this species is Tanzania (Uzaramo). It is a scrambling shrub or tree and grows primarily in the seasonally dry tropical biome.

Descriptions

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

Morphology General Habit
Shrub, sometimes scandent, 1.5–5 m. high, rarely with leaves and twigs in whorls of 3; young twigs puberulous.
Morphology Leaves
Leaf-blades ovate or elliptic, 6–12 cm. long, 3–5 cm. wide, acuminate at apex, rounded or cuneate at base, glabrous except for the puberulous midrib beneath, coriaceous, glossy above; 3–5(–6) pairs of lateral nerves; tertiary nerves perpendicular to midrib, ± conspicuous (reminiscent of Mussaenda arcuata); domatia hairy; petiole 5–10 mm. long, puberulous; stipules triangular, fused at the base, with awns 4 mm. long, puberulous outside, inside with silky hairs and colleters in a row.
Morphology Reproductive morphology Flowers
Flowers 6-merous, sessile; inflorescences 3- or 5-flowered; bracts and bracteoles cupular but not resembling calyx-limb, provided with 2(–4) short awns and 2 ± leafy appendages, pubescent outside and with silky hairs and a row of colleters at the base inside.
Morphology Reproductive morphology Flowers Calyx
Calyx-tube pubescent; limb 3 mm. long, deeply divided into 4 lobes, shallowly notched at the tip, similar to bracteoles in hairiness and colleters.
Morphology Reproductive morphology Flowers Corolla
Corolla white (only one withered one known), pubescent outside; tube ± 4 cm. long, sparsely hairy inside; lobes ± 1/3 the length of the tube.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anthers sessile, pubescent, 2 mm. long, almost included, apiculate.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Placenta with ± 12 ovules; style pubescent, ? exserted.
Morphology Reproductive morphology Fruits
Fruit imperfectly known, almost spherical, ± 1.6 cm. in diameter, crowned by the persistent calyx-limb.
Morphology Reproductive morphology Seeds
Seeds numerous in both chambers; seed-coat with elevated isodiametric cells.
Figures
Fig. 89/1.
Habitat
Lowland evergreen forest, coastal semi-deciduous thicket on sand; up to 450 m.
Distribution
not known elsewhere T6
[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/

  • 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