Dypsis makirae Rakotoarin. & Britt, Palms (1999+). 53(3): 142 (2009)

Primary tabs

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Madagascarnative (Palms (1999+). 53: 136 (2009))B
Northeast Madagascar, known from several localities in the eastern central part of the Makira protected area. (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Habitat

  • Primary rain forest, on steep slopes near ridge tops, 600-900 m.

Discussion

  • Vegetatively, this palm superficially resembles Dypsis bonsai or some forms of D. procumbens. However, the inflorescence is composed of long, thick rachillae with flowers and fruits borne in shallow pits, suggesting a relationship with the species of Dypsis Group 7 (e.g. D. boiviniana, D. sanctaemariae, D. mangorensis) defined by Dransfield and Beentje (1995). It is easily distinguished by the almost disproportionately robust, erect inflorescences. (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Diagnosis

  • Habitu D. bonsai et D. procumbenti similis sed ramis inflorescentiae longioribus crassioribus foveolatis differt. (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Conservation

  • Vulnerable [VU (D1+2)],(provisional assessment). A common palm along the eastern edge of the central part of Makira. The population is estimated to exceed one thousand indviduals, many occurring within the protected area. (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Common Name

  • Tsingovatra (Betsimisaraka). (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Description

  • Solitary palm. Stem 4-5 m high, ca. 6 cm diam. Leaves 10-13 in the crown, spiral; sheath 14-16 cm, 1.8-2.2 cm diam., closed, forming well-defined crownshaft, brown with dense red pubescence in the upper part, triangular auricles up to 8mm; petiole 4-15 cm long, 3-6 mm wide, slightly or densely pubescent/scaly, adaxially flattened; leaf rachis 20.5-25 cm long, 3-6 mm wide in mid-leaf, triangular in section, pubescent/scaly; leaflets lanceolate, strongly cucullate, 4-8 on each side of the rachis, in groups of 2-4 leaflets, groups 11-12.5 cm apart, the proximal leaflets 12-17 × 2.4-5.2 cm, median leaflets 20.5-24 × 2.7-5.5 cm, distal leaflets 14-17 × 3-7.5 cm, width of leaflet base at insertion on rachis 0.5-3 cm, distal leaflet pair often multifold, acumen 0.8- 4 cm, abaxial surface with scattered to abundant scales in proximal part and occasionally bands of minute punctiform scales on the margin and along the blade. Inflorescence interfoliar, branched to 2 orders, erect; peduncle 38-40 cm long, 0.8-1.7 cm wide, densely pubescent; prophyll 28-34 cm long, 2-3 cm wide, borne 7 cm above the base of peduncle, with sparse to dense reddish tomentum, 2-keeled, opening distally 5.5-9 cm; peduncular bract not seen, deciduous, inserted at 23-25 cm from the base of peduncle; rachis 23-37 cm long including terminal rachilla, slightly to densely pubescent, with 2-4 branched and 7-10 unbranched first order branches, the proximal with a secondary rachis up to 7.5 cm, with up to 3 rachillae; rachillae 16-32 cm long, 2-5 mm diam., densely puberulous, triads rather closely packed in shallow pits. Flowers not seen. Fruits yellowish, ellipsoid, slightly curved 9-12 × 3-4 mm, mesocarp fleshy, endocarp fibrous. Seeds ca. 9 × 2 mm, pointed at the apex, homogeneous endosperm. (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Materials Examined

  • Madagascar, Toamasina, Maroantsetra, Makira protected area, Ambinanitelo: Tsaramain-Andro, March 2005, Britt & Rakotonasolo 195 (holotype K, isotype TAN), Britt & Rakotonasolo 207 (K, TAN); Ankirindro, May 2007, Rakotoarinivo et al. 346 (K, TAN). (M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009)A

Bibliography

A. M. Rakotoarinivo, M.S.Trudgen & W.J.Baker, The Palms of the Makira Protected Area, Madagascar in Palms (1999+) 53(3). 2009
B. Palms (1999+). 53: 136 (2009)