Rhapis humilis Blume

First published in Rumphia 2: 54 (1839)
This species is accepted
The native range of this species is China (SE. Yunnan, Guangxi, Guizhou). It is a shrub and grows primarily in the subtropical biome.

Descriptions

Biology
Habitat. Forest, 100–1000 m.
Distribution
South China, Sichuan; South Japan, South Kyushu Island.
General Description
Stems to 6 m tall, with sheaths 18–40 mm diam., without 15–28 mm. Leaf sheath closely sheathing the stem, fibers narrow, outer and inner fibers of similar thickness, producing a squared mesh, ligule remaining intact at maturity; petiole to 4 mm wide, sometimes minutely scabrid; blade with semi-circular to lunulate outline, with a conspicuous palman, segments 7–20, folds 16–36, to 440 mm long, sides slightly curved, apices oblique with irregular secondary splitting, primary splits to within 19-105 mm of the blade base, with tomentum at the base, brown papillae along the ribs, mostly adaxially, ribs scabrid, thick in texture, adaxial and abaxial surfaces similar in colour. Inflorescence, male and female similar in appearance, branching to 3 orders; prophyll tubular, overlapping the base of the first rachis bract, medium thickness, pale brown with areas of greenish brown, mostly glabrous with patches of tomentum on the outer surface edges; rachis bracts 3(–4), sometimes with a distal incomplete rachis bract, similar in appearance to the prophyll, overlapping the base of the next bract; rachis overall length to 410 mm, to 10 mm diam., rachillae 8–165 mm long, slender 0.2–1.2 mm diam., dark brown with rusty tomentum. Flowers 1.0–3.5 mm apart, large. Male flowers sometimes paired, long, obtriangular to 6.6 × 2.8 mm; calyx to 1.8 mm, minutely papillate usually with tomentum on the apices of the lobes, lobes shallow to 0.5 mm with regular margins; corolla narrowing gradually into a receptacular-stalk to 1.9 mm; filaments, shorter row to 3.2 mm, longer to 3.8 mm, to 0.4 mm diam. Female flowers to 4.4 × 2.5 mm; calyx to 2.3 mm, tomentose, lobes to 1 mm with regular margin and acute apices; corolla clavate, distinctly narrowed to 1.5 mm in diam., with a receptacular-stalk to 2.5 mm; staminodes present. Fruit unavailable.
[PW]

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]

Distribution
South China, West Guangxi, South East Guangdong.
General Description
Stems recorded to 2.5 m tall, diam. not recorded. Leaf sheath fibers close together with coarse outer fibers partially obscuring finer inner ones, producing a diagonal-lined mesh, ligule often remaining intact at maturity; petiole to 4 mm wide, margin smooth; blade large, with conspicuous palman, segments 14, folds 30, the longest segments to 450 mm, narrow (1 or 2 folds), tapering, apices pointed with secondary splitting, primary splits to within 23–66 mm of the blade base, thick in texture. Inflorescence, male not seen, female branching to 2 orders; prophyll similar in appearance to rachis bracts; rachis bracts 3 or 4, large, tubular, overlapping the base of the next rachis bract, relatively thick in texture, dark brown, lacking tomentum, sometimes also a distal incomplete rachis bract present; rachis greatly exceeding the bracts, overall length to 560 mm, broad 8–10 mm diam., rachillae densely packed on the rachis, those of the second order held at right angles to those of the first order, relatively short and narrow, pale brown with pale rusty brown tomentum. Male flowers unavailable. Female flowers 3–5 mm apart, to 4.5 × 3.0 mm; calyx to 2 mm, tomentose, lobes to 0.8 mm with pale edged irregular margin; corolla darkly pigmented, with a long receptacular-stalk to 2.5 mm; staminodes present. Fruit to 8 mm diam., borne on a receptacular-stalk to 5 mm long; epicarp shiny translucent papillose, apical region with conspicuous lenticels.
Biology
Habitat. 1000–1500 m, shrub in mixed forest on rocky slopes.
[PW]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • Herbarium Catalogue Specimens

  • 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
  • Palmweb - Palms of the World Online

    • Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
    • Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License http://creativecommons.org/licenses/by-nc-sa/3.0