Dypsis gautieri

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Dypsis (DIP-sis)
gautieri (gaw-tee-EHR-ee)
Dypsis-gautieri-in-habitat-in-Madagascar1.jpg
Madagascar. Photo by Dr. John Dransfield, Royal Botanic Gardens, Kew/Palmweb.
Scientific Classification
Genus: Dypsis (DIP-sis)
Species:
gautieri (gaw-tee-EHR-ee)
Synonyms
None set.
Native Continent
Africa
Africa.gif
Morphology
Habit: Solitary
Leaf type: Pinnate
Culture
Survivability index
Common names
None.

Habitat and Distribution

Endemic to Madagascar. Known only from Daraina, in the north of Madagascar. Montane forest,
Madagascar. Photo by Dr. John Dransfield, Royal Botanic Gardens, Kew/Palmweb.
crest of ridge; alt. 1040 m.

Description

Solitary palm. Stems erect, 2 - 5 m high, 1.8- 3.5 cm in diam., internodes 2.1- 3 cm, green to grey brown, minutely scaly near the crown. Leaves about 9 in the crown, pinnate; sheaths 17- 18.5 cm long, 2.8-3.5 cm wide, closed, forming a well defined crownshaft, minutely scaly in all parts and covered with tomentum in the upper part, auricles irregularly triangular, to about 3 - 4 x 0.4- 0.6 cm, tattering; petiole absent or up to 2 cm long; rachis 45- 55 cm long, about 0.5 cm in diam., densely covered with scales, adaxially channelled at the base then triangular in the median and distal parts; leaflets 18- 22 on each side of the rachis, in groups of 2- 5, at intervals of 4 -9 cm, the leaflets within the group 0.5- 1 cm apart; proximal leaflets 11- 12.3 ?x 0.4-0.6 cm, median 18- 21 x 1.7- 2.2 cm, distal 12- 14 x 2-2.5 cm, lamina covered in scattered brown scales, main veins 3, apices 1.4 - 2 cm long. Inflorescence interfoliar, branched to 3- 4 orders, arching; peduncle about 40 cm long, 0.8 cm wide, densely covered in brown scales; prophyll inserted about 1 cm above the base of peduncle, about 15x 1.5 cm, split to 2.4 cm in the distal part, scaly, keeled; peduncular bract persistent, inserted about 15 cm above the base of peduncle, about 19 x1.2 cm, beaked for about 6 mm, split to 4 cm distally, with scattered scales; rachis about 45 cm long, 2 . 8 mm in diam., densely scaly, with 24 branched and 7 unbranched first order branches, proximal first order branches to 13 cm long, with 6 branched and 10 unbranched second order branches, proximally to 2 . 4 x 0.1-0.2 cm; rachillae 3 -5 cm long, about 0.5 mm in diam., densely puberulous; triads inserted at intervals of 1.2-3.8 mm. Staminate flowers with sepals imbricate, unequal, 2.2- 2.6 x 2.6- 2.8 mm, densely scaly, keeled,± asymmetrical; petals imbricate but valvate at the tip, 3.2- 3.8x 2.2 . 2.8 cm, striate, minutely puberulous; stamens 3, antepetalous, filaments short about 1 mm long, erect, anthers broad, sagittate, with 2 locules neatly differentiated, 10 - 12x 5- 8 mm; staminodes 3, minute about 0.4 mm high; pistillode hexagonal, about 0.6 mm high. Pistillate flowers with sepals imbricate, unequal, 2.4- 2.9 x 2.6- 2.8 mm, scaly, asymmetrical, keeled; petals imbricate, 2.8- 3.4 x 1.8 -2.4 mm, striate, elliptic; gynoecium obovoid, 1.4- 2 x 1.5- 1.6 mm. Fruits unknown. (M. Rakotoarinivo and J. Dransfield. 2010)/Palmweb. Editing by edric.

Because of the form of the leaves, this species is superficially like Dypsis pinnatifrons, although substantially smaller. However, the staminate flowers have three antepetalous stamens with broad sagittate anthers, rather than three antesepalous stamens with narrow sagittate anthers. It thus belongs to group 18 of Dransfield & Beentje (1995), some species of which were originally described in a separate genus, Trichodypsis. It is the only member of the group to have rather broad lanceolate single-fold leaflets grouped in tight clusters. The species is named for the collector, Laurent Gautier who has done much to catalogue the plant diversity of Daraina, a northern outlier of rain forest in Madagascar. (M. Rakotoarinivo and J. Dransfield. 2010)/Palmweb.

Culture

Comments and Curiosities

Conservation: Vulnerable [VU D2] - (IUCN Redlist) Rare species, less than 20 mature individuals have been seen but the species is located on the summit of mountains where access is difficult and the whole area is protected and managed by Fanamby NGO. (M. Rakotoarinivo and J. Dransfield. 2010)/Palmweb.


External Links

References

Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).

MADAGASCAR. Antsiranana, Vohemar, Daraina, 13º13'39"S, 49º32'08"E, 11 Nov. 2004, L. Gautier et al. LG 4703 (holotype K!; isotype G!). (M. Rakotoarinivo and J. Dransfield. 2010)
Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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