Ravenea hypoleuca Rakotoarin. & J.Dransf., Kew Bull. 65(2): 300 (2010)

Primary tabs

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)

Discussion

Diagnosis

Conservation

Description

  • Medium-sized solitary, dioecious palm. Trunk 6 - 10 m tall, 15 -20 cm diam., blackish brown, covered in sheath remnants in the upper part, c. 25 cm in cross section. Leaves 16 -20 in the crown, porrect, marcescent, litter-trapping; sheath 60 - 110 x 10 - 15 cm, pale green, covered in thick white tomentum, margins disintegrating and fibrous; petiole 80 - 150 cm long, 3.5- 4 x 1.5- 2.5 cm in cross section, deeply channelled, margins sharp, covered in white to greyish tomentum; rachis 3.5- 4 m long, in midleaf 2.5- 2.8 ?x 1.8 -2.3 cm in cross section, pale green, covered in thick white tomentum especially on the abaxial surface, keeled on the adaxial surface; leaflets stiff, regularly arranged in one plane, dark green, 52 - 58 on each side of the rachis, proximal leaflets 62- 85 ?x 1.5-2.8 cm, median leaflets 102- 116 x 2.4- 2.8 cm, distal leaflets 16-37- 1.2 - 2 cm, leaflets spaced 4 . 6 cm apart, abaxial surface with continuous white tomentum, transverse veinlets sinuous. Inflorescences interfoliar, solitary. Staminate inflorescence erect, branched to 2 orders; peduncle 24 . 30 cm long, c. 1.5 - 3 cm in cross section, prophyll not seen, peduncular bracts c. 73 cm long, c. 14 cm wide, purplish, covered in thick white tomentum; rachis c. 48 cm long; rachillae 12 - 20 cm long, c. 2 mm in cross section; pedicel 0.6 - 1.2 mm. Flowers not seen. Pistillate inflorescence interfoliar, solitary, erect, branched to 1 order, 20 - 30 cm long, c. 2.4 cm in cross section; prophyll and peduncular bracts not seen; rachis 10 - 17 cm long; first order branches 18 - 22; rachillae 28 - 42 cm long, up to 1 cm in cross section at the base; pedicel 3 - 5 mm high. Flowers not seen. Fruits not seen. (M. Rakotoarinivo & J. Dransfield, New species of Dypsis and Ravenea (Arecaceae) from Madagascar in Kew Bulletin 65. 2010)A

Materials Examined