Borassus heineanus

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Borassus (BOR-rahs-suhs)
heineanus (heen-eh-AHN-uhs)
Bheineanus2.jpg
Bheineanus2.jpg
Scientific Classification
Genus: Borassus (BOR-rahs-suhs)
Species:
heineanus (heen-eh-AHN-uhs)
Synonyms
None set.
Native Continent
Oceania
Oceania.gif
Morphology
Habit: Solitary
Leaf type: Costapalmate
Culture
Survivability index
Common names
Beiwof (Apau), Lipmemon (Kamangauwi dialect).

Habitat and Distribution

Borassus heineanus is found in New Guinea. Endemic to New Guinea.
PNG National Botanic Garden, Morobe, Papua New Guinea. Photo by Dr. William J. Baker, Royal Botanic Gardens, Kew/Palmweb.
Occurring in both Papua New Guinea and Indonesian Papua, but restricted to the northern side of the island. Tropical rain forest on alluvial sands. (R.P. Bayton. 2007)/Palmweb.

Description

Stem to 25 m tall, stem diameter unknown. Leaves 20 – 28 in the crown; petiole and sheath 150 – 300 cm long; petiole 3.1 – 5.2 cm wide at midpoint, green with very sharp black margins, but no spines; costa 130 – 150 cm long; adaxial hastula conspicuous, to 1.2 cm, abaxial hastula absent; lamina radius to 180 cm maximum; leaflets 50 – 90, 3.9 – 7.1 cm wide, apices bifid and cuspidate, shortest leaflet 110 – 130 cm long, leaf divided to 76 – 92 cm; commissural veins 3 – 6 per cm, leaf anatomy dorsiventral. Staminate inflorescences branched to one order, upper subtending branches terminating in 1 rachilla; rachillae brown and catkin-like, ± 70 cm long, 2.7 – 4.3 cm diameter; rachilla bracts forming pits containing a cincinnus of 6 – 12 flowers. Pistillate inflorescences spicate; flowerbearing portion 37 – 49 cm long with 7 – 22 flowers arranged spirally. Staminate flowers exserted from pits individually, 0.4 – 1 cm long, bracteoles 1 × 1 cm; calyx 0.3 × 0.8 cm, shallowly to deeply divided into three sepals, petal lobes 0.2 × 0.1 cm; stamens 6 with very short filaments, 0.11 × 0.15 cm, anthers 0.18 × 0.06 cm; pistillode distinct, 0.2 – 0.5 × 0.02 cm. Pollen monosulcate, elliptical, 51 – 70 mm long, aperture 41 – 63 mm long, polar axis 37 – 57 mm long; tectum perforate, sparsely covered with supratectal gemmae. Pistillate flowers 2.5 × 2 cm; bracteoles large, 1.5 cm diam., sepals 1.5 × 2 cm, petals 1.0 × 1.5 cm. Fruits large, 12 – 15 × 8 – 10 cm, ovoid with a slightly pointed apex, greenish black; pyrenes 1 – 3, 9.2 – 10.5 cm × 4.8 – 7.0 cm × 4.0 – 4.5 cm; endocarp sometimes with flanges that penetrate the seed. (R.P. Bayton. 2007)/Palmweb. Editing by edric.

Culture

This palm may also be cultivated. Cold Hardiness Zone: 11

Comments and Curiosities

Etymology: After Georg Heine, administrator with the German New Guinea Company, who collected the type specimen.

Conservation: Data deficient. Borassus heineanus has been collected in only seven locations in New Guinea. Kjær (2003) reported a stand of approximately 300 × 300 metres in an area by the Sepik River in Papua New Guinea. Additional localities may exist, and further collections are needed. (R.P. Bayton. 2007)/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).

Bayton, R.P.2007. A revision of Borassus L. (Arecaceae). Kew Bulletin 62: 561-586.


Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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