Laportea interrupta (L.) Chew

First published in Gard. Bull. Singapore 21: 200 (1965)
This species is accepted
The native range of this species is Tropical & S. Africa, Arabian Peninsula, Mozambique, Tropical & Subtropical Asia to NW. Pacific. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Urticaceae, I. Friis University of Copenhagen, Denmark. Flora of Tropical East Africa. 1989

Morphology General Habit
Annual herb, up to 1 m. tall.
Morphology Stem
Stems slightly woody at base, usually somewhat branched, puberulous to pubescent, with scattered stinging hairs up to 1.5 mm. long, sometimes raised on protuberances ± 1 mm. high; bark green to dark brown.
Morphology Leaves
Leaves crowded towards the top of the stem; stipules linear, connate 2/3 of their length or more, 3–5 mm. long, with short stiff hairs on the nerves; petiole (3–)5–11 cm. long, pilose to glabrescent, occasionally with a few stinging hairs; lamina ovate, 5–10 cm. long, 3–8 cm. wide, base broadly cuneate, truncate or subcordate, margin serrate, with 12–25(–30) teeth on each side, apex acute to acuminate; lateral nerves 3–6 pairs, basal pair reaching 6th–18th tooth from apex (about halfway to the apex); upper surface with scattered stiff or stinging hairs, cystoliths elongated, lower surface with scattered stiff or stinging hairs on the nerves.
Morphology Reproductive morphology Inflorescences
Inflorescences usually bisexual in the axils of the upper leaves, or in the axils of fallen leaves just above soil-level, single, paniculate, but with very reduced side-branches so the inflorescences appear as interrupted spikes, of an overall length up to 30 cm., often with clusters of flowers from the base, but sometimes with a peduncle up to 10 cm. long, axis glabrous or puberulous, flowers in cymose clusters up to 1 cm. in diameter.
sex Male
Male flowers appearing first, on pedicels ± 1 mm. long; perianth ± 1 mm. in diameter, 4-merous, with corniculate tepals, sometimes with a few stinging hairs.
Morphology Reproductive morphology Flowers
Female flowers:pedicels ± 0.5 mm. long, unwinged or slightly dorsally and ventrally winged; tepals:the lateral ones largest, ± 0.8 mm. long, the dorsal one geniculate; ovary with a style of 3 filiform stigmatic branches, the longest up to 0.5 mm. Male flowers appearing first, on pedicels ± 1 mm. long; perianth ± 1 mm. in diameter, 4-merous, with corniculate tepals, sometimes with a few stinging hairs.
sex Female
Female flowers:pedicels ± 0.5 mm. long, unwinged or slightly dorsally and ventrally winged; tepals:the lateral ones largest, ± 0.8 mm. long, the dorsal one geniculate; ovary with a style of 3 filiform stigmatic branches, the longest up to 0.5 mm.
Morphology Reproductive morphology Fruits
Achene ± 1.75 mm. long, ovoid, laterally compressed, not stipitate, with a flattened wing-like structure along the edge, and a ridge surrounding the warted central part of each side, dispersed with the perianth.
Figures
Fig. 6/A, p. 22 & 7/A, p. 24.
Habitat
Lowland rain-forest, often along roads, riverine forest, moist places in wooded grassland; 0–550(–±1000) m.
Distribution
K1/K7 K4 K7 T6 T7 T8 records of this species are widely and thinly scattered throughout the lowlands of tropical and South Africa, but many of these records are oldalso widely distributed in tropical Asia and Oceania, N. to Japan, S. to Australia (Queensland), E. to Hawaii and Tahiti
[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: not threatened. Confidence: confident
[AERP]

Urticaceae, I. Friis. Flora Zambesiaca 9:6. 1991

Morphology General Habit
Annual herbs up to c. 1 m. tall, monoecious; stems sparsely branching.
Morphology General Indumentum
Stinging hairs few, up to c. 1.5 mm. long, mostly restricted to upper part of the stem.
Morphology Leaves
Leaves crowded towards stem apex, 8–12 x 5–7 cm., ovate; apex acuminate; base rounded to truncate; margin finely serrate with 12–15(30) teeth per side; lamina glabrous or puberulent on both sides, with few stinging hairs, lateral nerves 3–6 pairs.
Morphology Leaves Petiole
Petiole 5–8 cm. long, pilose to glabrescent, stinging hairs occasional.
Morphology Leaves Stipules
Stipules 3–5 mm. long, linear.
Morphology Reproductive morphology Inflorescences
Inflorescences usually bisexual, in axils of upper leaves, or in axils of fallen leaves just above soil level, paniculate, but apparently interrupted-spicate due to reduction of side branches, up to c. 30 cm. long, flowers in cymose clusters c. 10 mm. in diam.
Morphology Reproductive morphology Flowers
Male flowers appearing first, pedicels c. 1 mm. long, perianth 1–2 mm. in diam., (3)4-merous, tepals corniculate. Female flowers pedicellate, pedicels c. 0.5 mm. long, unwinged; ovary compressed, stigma sessile 3-branched.
sex Male
Male flowers appearing first, pedicels c. 1 mm. long, perianth 1–2 mm. in diam., (3)4-merous, tepals corniculate.
sex Female
Female flowers pedicellate, pedicels c. 0.5 mm. long, unwinged; ovary compressed, stigma sessile 3-branched.
Morphology Reproductive morphology Fruits
Achenes c. 1.75 mm. long, ovoid, laterally compressed, with a circular ridge surrounding a rugose central part, not stipitate, shed without the perianth.
[FZ]

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
  • 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 2024. 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 2024. 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
  • Kew Science Photographs

    • Copyright applied to individual images