Dypsis metallica Rakotoarin. & J.Dransf., Kew Bull. 65(2): 282 (2010)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Madagascarpresent (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A
Northeast of Madagascar, known only from Sahamalaza area, on the east side of Masoala Peninsula. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Habitat

  • Heath forest developed on white sands associated with river terraces; 40 m. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Discussion

  • This species belongs to the informal Group 5 (Dransfield & Beentje 1995) and keys to Dypsis lutea. It is distinguished by being altogether more robust and by its unusual metallic-hued coriaceous leaves. This species is of high ornamental value. The species epithet refers to the metallic blue green leaves. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Diagnosis

  • D. luteae (Jum.) Beentje & J. Dransf. affinis sed folio metallico coriaceo linea centrali lutescenti differt. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Conservation

  • Vulnerable [VU (D2)], known only from Sahamalaza in the eastern part of the Masoala Peninsula. The population is estimated to occur in an area of 6 km2, within the Masoala National Park. Access is difficult and restricted. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Description

  • Clustering palm. Stem to 5 m tall, 1 - 2 cm diam., dark green, internodes 2.5 - 3 cm long near the crown, with reddish indumentum. Leaves 6 - 10 in the crown; sheaths 12 - 20 cm long, 1.5 - 2 cm diam., closed, forming a well-developed crownshaft, abaxially covered with purplish indumentum mostly in the upper part, with triangular auricles, 1.2 - 2.5 × 0.2 - 0.5 cm; petiole 7 - 11 cm long, 2 - 4 mm wide, adaxially flat or slightly channelled, abaxially rounded, scaly; blade entire bifid, very coriaceous, metallic blue-green with a central pale yellowish line, the entire lamina 39 - 54 cm long, 9.5 - 27 cm wide, midrib 19 - 33 cm long, lobes 17 - 21 × 15 - 16 cm, apices narrowly dentate, adaxial surface of the leaf with minute punctiform scales, abaxially with scales on the midrib and minute punctiform scales along the veins. Inflorescence interfoliar, branching to 2 orders; peduncle 28 - 32 cm long, 3 - 5 mm diam., densely hairy in exposed parts; prophyll 14 - 17 × 0.8 - 1 cm, inserted at 6 - 7.5 cm from the base of peduncle, splitting distally for 1.5 - 2.5 cm, 2-keeled; peduncular bract deciduous; rachis 12.5 - 15 cm long, minutely to densely puberulous, with 6 - 9 branched and 7 - 9 unbranched first order branches; rachillae 5 - 8.5 cm long, 1 - 1.5 mm diam., glabrous, triads inserted at distances of 1.5 - 3 mm. Staminate flowers with sepals 0.8 - 1 × 0.8 - 1.1 mm; petals elliptic, 1.2 - 1.5 × 0.8 - 1 mm, striate; stamens 6, uniseriate, filaments c. 0.2 mm long, anthers 0.6 - 0.8 × 0.2 - 0.5 mm, elongate; pistillode minute, c. 0.2 mm high. Pistillate flowers with sepals 0.9 - 1.1 × 0.8 - 1 mm; petals 0.7 - 0.8 × 0.5 - 0.6 mm, striate, staminodes absent; gynoecium c. 0.6 × 0.4 mm. Fruits not seen. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Materials Examined

  • MADAGASCAR. Antsiranana, Antalaha: Masoala Peninsula, Sahamalaza, Iketra, 15°44 ?S, 50°13 ?E, 16 Nov. 1996, J. Dransfield et al. JD 7636 (holotype K!; isotype TAN!). (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Bibliography

A. M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010