Arecaceae
Dypsis

Dypsis commersoniana (Baill.) Beentje & J.Dransf.

First published in Palms Madagascar: 236 (1995)
This species is accepted
The native range of this species is SE. Madagascar. It is a shrub or tree and grows primarily in the seasonally dry tropical biome.

Descriptions

Biology
Lowland rain forest; c. 120 m.
Vernacular
Not recorded.
Conservation
Critical. The distribution area is small, and under severe pressure by an expanding population. Nearly all lowland rain forest in the area has now been cleared.
Distribution
SE Madagascar.
General Description
Clustering palm. STEMS 1.8-5 m tall. LEAVES irregularly pinnate; sheaths only known from their distal part, with rounded shoulders and a few scattered scales; petiole 5-21 cm long, 2.5-3 mm diam., flat adaxially, with dense minute reddish scales; rachis 21-38 cm long, in mid- leaf 2-2.5 mm wide, with dense to scattered scales; leaflets in groups of 2 or irregular, 4-7 on each side of the rachis (interval 2-9 cm), distally sigmoid, proximal 5-23 x 0.4-1.6 cm, median 11-28 x 1.3-2.5 cm, cuneate at the base, acuminate, the distal leaflets often praemorse-denticulate on the distal lower margin, glabrous, top pair forming a deeply lobed flabellum 15-33 cm long, connate for 6-11 cm, the lobes 12-23 x 3.4-5 cm, with denticu-late-praemorse apices 2-4 cm wide and with the teeth continuing along the distal margin, and 6-7 main veins, leaflets glabrous except for the very base. INFLORESCENCE interfoliar, branched to 2 orders; peduncle c. 24 cm long outside the sheath, compressed, 2.5-6 mm wide distally, with rather dense minute reddish scales; prophyll c. 15 cm long outside the sheath, opening only in the distal 1-3 cm, with scattered scales; peduncular bract inserted at 12 cm above the sheath apex, c. 13 x 0.6 cm, with scattered scales, split over its length, deciduous; rachis 20-33 cm long, with 6-11 branched and 10-13 unbranched first order branches, the proximal with a rachis to 8 cm and up to 7 rachillae; rachis bracts up to 4 x 2.5 mm; rachillae 3-14 cm long, 0.5-1 mm diam., minutely puberulous; triads rather distant, superficial; rachilla bract concave, apiculate. STAMINATE FLOWERS with sepals 0.5-0.7 x 0.7-1 mm, keeled and gibbous, orbicular, rounded; petals 1.2-1.8 x 0.9-1.2 mm, elliptic, acute, striate; stamens 6, slightly biseriate (0.2 mm offset, the inner higher), the filaments 0.4-1 mm long, thin, the anthers 0.8-1.3 x 0.3-0.5 mm, dorsifixed, versatile, with parallel acute locules; ovary rudiment with wide base, distally subtrigonouspyramidal, 0.6-0.8 x 0.2-0.3 mm. PISTILLATE FLOWERS with sepals 0.5-0.6 x 0.5-1 mm; petals 2-2.4 x 1.8-2.3 mm; staminodes 6, minute; gynoecium when young to 1 mm high. FRUIT only known when young, up to 9 x 3 mm, with rather pointed apex.
[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: threatened. Confidence: confident
[AERP]

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/38527/2872355

Conservation
DD - data deficient
[IUCN]

Uses

Use
Not recorded.
[PW]

Sources

  • Angiosperm Extinction Risk Predictions v1

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

  • Herbarium Catalogue Specimens

  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/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

  • 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