Rubiaceae

Mitriostigma Hochst.

First published in Flora 25: 235 (1842)
This genus is accepted
The native range of this genus is Bioko to Kenya and S. Africa.

Descriptions

Rubiaceae, D.M.Bridson & B.Verdcourt. Flora Zambesiaca 5:3. 2003

Morphology General Habit
Shrubs or small trees.
Morphology Leaves
Leaves petiolate; domatia absent or present as small tufts of hairs in the axils of the lateral nerves; stipules green in dry state, erect, persistent, scarcely connate at the base.
Morphology Reproductive morphology Inflorescences
Inflorescences of small cymes, lateral at successive nodes (TAB. 75/6) or axillary on both sides of the stem at the same node (not in the Flora Zambesiaca area), moderately lax or condensed; bracteoles present.
Morphology Reproductive morphology Flowers
Flowers hermaphrodite, 5-merous, subsessile to shortly pedicellate.
Morphology Reproductive morphology Flowers Calyx
Calyx tube turbinate to ellipsoid; limb-tube with a distinct tubular part and narrowly triangular lobes.
Morphology Reproductive morphology Flowers Corolla
Corolla white, or red or purple (not in the Flora Zambesiaca area), glabrous outside; tube not markedly long, cylindrical at the base and campanulate or funnel-shaped above or cylindrical and widening only near apex, ± glabrous to sparsely pubescent within; lobes short and erect or longer and erect or spreading.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted in broad part of corolla tube; anthers subsessile, attached near the base, entirely included or up to 2/3 exserted, shortly apiculate; pollen in tetrads.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary 2-locular; placentas rather fleshy, subpendulous, bearing 6–25 ovules, ovules not immersed; style slender, glabrous; pollen presenter included or exserted, winged, mitriform or scarcely so at apex, shortly bifid.
Morphology Reproductive morphology Fruits
Fruit globose to ellipsoid, crowned by a persistent calyx limb.
Morphology Reproductive morphology Seeds
Seeds quite large, 4.5–6 mm across, somewhat compressed or not, fleshy; testa ornamented with fine narrow reticulations.
[FZ]

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

Morphology General Habit
Small shrubs
Morphology Leaves
Leaves petiolate; domatia absent or present as small hairy tufts in the axils of the lateral nerves; stipules green in dry state, erect, persistent, scarcely connate at base
Morphology Reproductive morphology Flowers
Flowers hermaphrodite, 5-merous, subsessile to shortly pedicellate in small cymes, lateral at successive nodes or axillary, moderately lax or condensed; bracteoles present
Morphology Reproductive morphology Flowers Calyx
Calyx-tube turbinate to ellipsoid; limb with distinct tubular part and narrowly triangular lobes
Morphology Reproductive morphology Flowers Corolla
Corolla usually white, glabrous outside; tube not markedly long, cylindrical at base and campanulate or funnel-shaped above or cylindrical and widening only near apex, ± glabrous to sparsely pubescent inside; lobes short and erect or larger and erect or spreading
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens inserted in broad part of corolla-tube; anthers subsessile, attached near the base, entirely included or up to 2/3-exserted, shortly apiculate
Morphology Reproductive morphology Flowers Gynoecium Pistil
Style slender, glabrous; stigmatic club included or exserted, winged, mitriform or scarcely so, shortly bifid at apex
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 2-locular; placentas rather fleshy, subpendulous, bearing 6–12 ovules, not immersed in placental tissue
Morphology Reproductive morphology Fruits
Fruit globose to ellipsoid, crowned by persistent calyx-limb
Morphology Reproductive morphology Seeds
Seeds quite large, 4.5–6 mm. across, somewhat compressed or not, fleshy; testa ornamented with fine narrow reticulations.
[FTEA]

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.

  • 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