Apiaceae
Oenanthe

Oenanthe palustris (Chiov.) C.Norman

First published in J. Bot. 71: 135 (1933)
This species is accepted
The native range of this species is Ethiopia to E. Central & E. Tropical Africa. It is a perennial or helophyte and grows primarily in the subtropical biome.

Descriptions

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]

Umbelliferae, C.C. Townsend. Flora of Tropical East Africa. 1989

Morphology General Habit
Ascending, glabrous perennial herb, sometimes scrambling over other herbs, with the lower internodes rooting, 0.5–1.6 m. from the uppermost rooting node upwards.
Morphology Stem
Stem fistular, succulent, coarsely ribbed and furrowed, up to ± 1 cm. wide below, little branched; internodes long, to ± 14 cm.
Morphology Leaves
Lower leaves with the lamina deltoid in outline, ± 8–22 cm. long and 10–30 cm. wide, bipinnate with 3–5 pairs of pinnae, 2–3(–4) pairs of which are stalked; pinnules in 1–2 pairs, the leaflets lanceolate to elliptic-lanceolate, ± 12–50 × 5–20 mm., rather regularly to somewhat irregularly serrate-dentate, the apical and basal in particular often incised on one or both sides, teeth with a rather long, sharp mucro; sheaths narrowly oblong, striate, rounded or auriculate above, ± 1.5–5 cm., broadly membranous-margined; petiole 3–12 cm.; upper leaves similar, becoming smaller, sessile and finally pinnate or trisect.
Morphology Reproductive morphology Inflorescences
Umbels on 5–15 cm. peduncles, ± 11–21-rayed, the rays 0.6–3(–3.8) cm., sometimes a central umbellule sessile; involucre absent or of 1–2 linear bracts 3–18 mm. long, usually with abroad, sheathing base; partial umbels ± 10–24(–30)-flowered; pedicels 1.5–3 mm.; involucel of 6–9 very narrow bracteoles 2–8 mm. long, not too considerably exceeding the flowers.
Morphology Reproductive morphology Flowers Calyx
Calyx-teeth small, subulate, subequal, shorter than the petals.
Morphology Reproductive morphology Flowers Corolla
Petals white to creamy-green, oblong-obovate, ± 0.75 mm., incurved.
Morphology Reproductive morphology Fruits
Fruit broadly oblong, ± 3–4 × 2–3 mm., 4 dorsal ribs broad and rounded, all subequal, marginal/commissural ribs flattened; stylopodia conical; styles rather short, divergent, ± 0.75–1 mm., longer than the stylopodia.
Figures
Fig. 26/5, 6.
Habitat
In or by water; along rivers and streams (often in or at the edge of forests), lakesides, marshes and in Papyrus swamps, along drains on montane heaths;1130–2700 m.
Distribution
K3 K4 K5 K6 T2 T4 U2 U4
[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

    • '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 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