Ravenea xerophila Jum.

This species is accepted, and its native range is S. Madagascar.

[PW]
Biology
Dry spiny Didiereaceae/Euphorbia bush or dry low forest (Humbert), on laterite or gneiss; 200-700 m. May grow in groups.
General Description
Solitary medium-sized palm. TRUNK 1.5-8 m, 13-30 cm diam., widened at the very base; distal half of trunk (or in smaller trees the entire trunk) covered in densely packed sheath remnants; near crown c. 10 cm diam.; bark brown; internodes 2.5-8 cm; nodal scars 0.5-1 cm, occasionally with tattered sheath remnants appearing as threads; wood hard; trunk sometimes producing a yellow latex-like substance when slashed. LEAVES (11-) 18-22 per crown, glaucous, gracefully arching, with stiff segments, the old leaves marcescent; sheath 36-55 x 13-20 cm, white- to dark brown tomentose, the tomentum quickly deciduous, the distal part waxy-white; petiole 22-60 cm long, proximally 2.8-6 x 2.0-3.5 cm, distally 1.4-3.0 x 1.4-2 cm, slightly channelled adaxially, with rather sharp edges, proximally red-brown tomentose, distally glabrous and yellow or with whitish bloom when dry, abaxially strongly convex; rachis 1-2.1 m long, in mid-leaf 0.9-2 x 0.8-1.6 cm, pale green with white bloom; leaflets pale green, stiff, coriaceous, the leaflets on opposite sides of the rachis at an angle of 90° with each other, slightly glaucous, acuminate, 47-55 on each side of the rachis, regular, coriaceous, glaucous, the proximal ones 33-110 x 0.3-1.5 cm, median 43-64 (94) x 1.3-2.4 cm (interval 3.5-4 cm), distal 11-44 x 0.3-1.3 cm, secondary veins very visible, tertiary veins indistinct, ramenta red-brown or grey, elongate, 1-2 (-3) near the base of lower leaflets, to large patches of dense ramenta in the proximal third of the midrib, upper 12 pairs without ramenta. STAMINATE INFLORESCENCE solitary, 55-58 cm, branched to 1 order; peduncle 15-19 (or more) cm, distally 5 x 3 mm across; prophyll not seen; peduncular bracts seen 31 cm, 41-62 cm, 44-62 cm; rachis 29-40 cm, with c. 100 branches; rachillae 1.5-7.5 cm, 0.6-1 mm across; pedicels c. 0.2 mm long, 0.7 mm across, with a 1-1.3 mm bracteole. STAMINATE FLOWERS with the calyx connate for 0.3 mm, free lobes 1.9 x 0.3 mm; petals 6-7 x 2.4-2.5 mm, connate by the fila-mental callus of the antesepalous stamens; stamens in 2 series, the antesepalous ones with a filamentous callus 0.6 x 0.4 mm, anthers 2 0.9 mm; antepetalous ones adnate to the petals for c. 1.1 mm, with no free filament, anthers 1.9-2 x 0.9 mm. PISTILLATE INFLORESCENCE solitary, 60-80 (or more) cm, branched to 1 order; peduncle 36-40 cm, proximally 8-13 mm across, 6-13 x 3-9 mm across distally, usually with whitish bloom, occasionally puberulous, glabrescent; prophyll not seen; peduncular bracts white to brown- pubescent, (in bud 15, 21, 20-32 x 1 cm, 31-40 x 1 cm), densely white-tomentose, more brown distally, the most distal one inserted at 21 cm from the base of the peduncle; rachis 20-35 cm long; rachillae porrect, 22-41 in number, 5-33 cm long, 1-2.2 mm across, with slightly bulbous base, proximally 4-7 x 2-5 mm, sinuous, more distally zigzag, with spaced flowers; pedicels 0.5-8 mm long. PISTILLATE FLOWERS with the calyx connate for 0.9-1.2 mm, with free lobes 1-1.3 mm; petals 4-6 x 1.5 mm, narrowly triangular, acute; staminodes 1.7 mm; ovary broadly ovoid to conical, 2 mm. FRUIT 15-22 x 17-27 mm, yellowish, 1-, 2- or 3-seeded, 20-26 mm across in 1seeded fruit, lobed in the more-seeded ones and then 22-23 x 22-34 mm; stigmatic remains subapical to lateral; endocarp slightly sclerified, loose and rather thin. SEED 16-18 x 12-18 mm, globose, hemispherical or in the shape of a third of a sphere, yellow-brown, with white endosperm with small central lacuna.
Distribution
S Madagascar, between Ampanihy and the Ampingaratra Mts.
Vernacular
Ahaza, Anivo (Mahafaly); Anivona (Antandroy).
Conservation
Endangered. 65 trees with trunks seen, and some 80 seedlings in the two populations known in recent times. The Tranoroa site is being destroyed by overgrazing.

[PW]
Use
Leaves used to weave winnowing baskets and hats.

Native to:

Madagascar

Ravenea xerophila Jum. appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Jan 1, 1995 Beentje, H.J. [4753], Madagascar 29047.851 No
Jan 1, 1995 Beentje, H.J. [4590], Madagascar 58852.000 No
Jan 1, 1995 Beentje, H.J. [4751], Madagascar 60429.000 No
Jan 1, 1995 Beentje, H.J. [4754], Madagascar 60433.000 No
Jan 1, 1995 Beentje, H.J. [4590], Madagascar K000114676 No
Jan 1, 1995 Beentje, H.J. [4754], Madagascar K000114677 No
Jan 1, 1995 Razafindratsira, A. [s.n.], Madagascar K000114678 No
Jan 1, 1995 Willing, T. [64], Madagascar K000114679 No
Jan 1, 1995 Du Puy, B. [MB575], Madagascar K000114680 No
Jan 1, 1995 Beentje, H.J. [4753], Madagascar K000114682 No
Jan 1, 1995 Beentje, H.J. [4751], Madagascar K000114681 No
Beentje, H.J. [4754], Madagascar 60479.000 No
Phillipson, P.B. [3991], Madagascar K000114675 No
Ksenzakovic, G. [s.n.] 66964.000 No

First published in Ann. Mus. Colon. Marseille, sér. 5, 1(1): 28 (1933)

Accepted by

  • Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Palmweb - Palms of the World Online

  • J. Dransfield & H. Beentje, The Palms of Madagascar. 1995

  • Herbarium Catalogue Specimens

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

  • Kew Names and Taxonomic Backbone

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. 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