Pinanga tenacinervis

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Pinanga (pih-NAHN-gah)
tenacinervis
(teh-nahs-ih-NEHR-viss)
Pt2786950.jpg
Photo by Dr. John Dransfield, Royal Botanic Gardens, Kew/Palmweb.
Scientific Classification
Genus: Pinanga (pih-NAHN-gah)
Species:
tenacinervis
(teh-nahs-ih-NEHR-viss)
Synonyms
None set.
Native Continent
Asia
Asia.gif
Morphology
Habit: Clustering
Leaf type: Pinnate
Culture
Survivability index
Common names
None.

Habitat and Distribution

Borneo.
Photo by Dr. John Dransfield, Royal Botanic Gardens, Kew/Palmweb.

Description

Clustering, acaulescent, unarmed, pleonanthic monoecious palm. Stems apparently suckering underground to produce rather loose colonies of 3-5 stems; stem very short, scarcely more than 10 cm tall, surrounded by conspicuous stilt roots, about 3 mm in diam.; stem to 1.2 cm in diam., with internodes to 8 mm long, with surface dull greenish-brown, glabrous. Crownshaft to 16 x 2 cm, bright green, shiny when fresh, dull, striate when dry, with inconspicuous scattered brown scales. Crown with 5-6 leaves. Whole leaf including leaf sheath to about 110 cm; leaf sheath about 10 cm long; petiole 45 cm x 3 mm, triangular in cross-section, bright green, bearing very sparse, scattered brown scales; leaflets 5-6 on each side of the rachis, subopposite or alternate, dark green, shiny above when fresh, ± sigmoid, the apical pair joined; lowermost leaflet pair generally narrower than the rest to 18 x 2 cm; mid-leaf leaflets to 22 x 5 cm, long-acuminate, rarely a single fold leaflet present to 1 cm wide; apical leaflets to 12 cm long, 4 cm wide with a coarsely dentate upper margin; leaflets 1-6-ribbed; lamina very sparsely brown-scaly on upper surface, on lower surface with scattered minute, brown-based, branched, white hairs; fibres of fibrovascular bundles extremely tough, the leaflets hence difficult to tear, the fibres protruding from torn surfaces in the manner of the leaf of Cornus sanguinea. Inflorescence spicate or bifid, pendulous, to 10 cm long with a basal peduncular portion about 2 cm long; prophyll only known in immature state, strongly two-keeled; rachillae green, glabrous; triads arranged strictly distichously, about 4 mm distant. Staminate flower unknown except in a very immature state; stamens apparently 8 in number. Pistillate flower globular, somewhat sunken into the rachilla; calyx tubular below with 3 ovate, cucullate, glabrous sepals, about 1.5 mm high; corolla of 3 ovate, cucullate, glabrous, imbricate petals about 1.2 mm high; ovary ovoid about 1 mm high, tipped with irregular umbonate stigma. Almost mature fruit crimson, shiny, fusiform, about 1.2 x 4 mm; endosperm apparently ruminate. (J. Dransfield. 1980)/Palmweb. Editing by edric.

I have seen no other specimen of this distinctive Pinanga. Although there is a superficial resemblance to P. patula Blume, the gamosepalous pistillate flower suggests a relationship with P. albescens Becc. ex H. Winkler. (J. Dransfield. 1980)/Palmweb.

Culture

Comments and Curiosities


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).

Dransfield, J. 1980. Systematic Notes on Pinanga (Palmae) in Borneo. Kew Bulletin, Vol. 34, No. 4, pp. 769-788.


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

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