Ponapea Becc.
  • Bot. Jahrb. Syst. 59: 13 (1924) 


Notes: Distribution: Bismarck Arch. to NW. Pacific

General Description

Moderate, solitary, unarmed, pleonanthic, monoecious palm. Stem erect, moderate, smooth, grey, ringed with leaf scars. Leaves pinnate, arching; sheath forming a prominent crownshaft, abaxially densely covered with grey scales; petiole well developed, deeply channelled adaxially, rounded abaxially, covered with small brown punctiform scales; rachis channelled basally, ridged distally; leaflets broadly lanceolate, regularly arranged, tips oblique to truncate, conspicuously praemorse, adaxially glabrous, abaxially covered with numerous dark brown ramenta on major veins, transverse veinlets not apparent. Inflorescences infrafoliar, held horizontally, branched to 4 orders basally, to 2–1 orders distally; peduncle short, rather slender, flattened, glabrous; prophyll tubular, membranous, bearing scattered scales, rounded at the tip, splitting abaxially allowing the peduncular bract to emerge; peduncular bract borne just above the prophyll, exceeding the prophyll, longitudinally splitting, caducous, bearing scales as the prophyll; peduncular bract tubular, caducous, shortly beaked, splitting abaxially, adaxially glabrous, abaxially densely to lightly covered in stellate brown scales, scar of 1 incomplete peduncular bract present; rachis much longer than the peduncle, elongate, tapering, bearing rather widely spaced ± angled first-order branches, each subtended by a very small, ridge-like bract; rachillae white, slender, spreading, somewhat divaricate and zig-zag, glabrous, bearing subdistichous, distant triads of flowers for 2/3 their length and paired to solitary staminate flowers distally; floral bracteoles large, low, rounded. Staminate flowers symmetrical, bullet-shaped; sepals 3, distinct, broadly imbricate, irregularly rounded, somewhat gibbous; petals 3, distinct, ovate, valvate, evenly thickened, adaxially grooved; stamens ca. 100, filaments erect in bud, short, awl-shaped, anthers oblong-elliptical, curled, deeply bifid basally and apically, dorsifixed near the base, ?latrorse, connective broad, tanniniferous; pistillode conical, much shorter than the stamens. Pollen ellipsoidal asymmetric; aperture a distal sulcus; ectexine tectate, finely perforate-rugulate, aperture margin similar or slightly finer; infratectum columellate; longest axis 43–51 µm [1/3]. Pistillate flowers ovoid; sepals 3, distinct, imbricate, rounded, margins variously split; petals 3, distinct, broadly ovate and imbricate, tips thick, valvate, opening briefly apically to expose the stigmas at anthesis; staminodes 3, irregular, tooth-like; gynoecium asymmetrical, ovoid with a bulge on one side, unilocular, uniovulate, stigmas 3, fleshy, recurved at anthesis, ovule very large, laterally attached, form unknown. Fruit ovoid when fresh, drying irregularly 5-ridged, red at maturity, stigmatic remains apical, perianth persistent; epicarp smooth, becoming somewhat striate when dry, mesocarp fleshy, endocarp thick, black, conspicuously 5-ridged (Ponapea leddermanniana), ridged and straw-coloured (P. hosinoi), or terete and straw-coloured (P. palauensis). Seed attached laterally, ovoid, conforming to the shape of the endocarp, hilum elongate, raphe branches anastomosing, endosperm homogeneous; embryo basal. Germination adjacent-ligular; eophyll bifid with broad conspicuously praemorse lobes. Cytology not studied.

Diagnostic Description

Moderate, solitary pinnate-leaved palms, native to the Caroline Islands, all with crownshafts and praemorse leaflets.

Morphology

Fruit (Essig 1977).

Biology

Found in rain forest along banks of streams at low elevations.

Distribution

Three species in the Caroline Islands (Pohnpei and Palau).

Uses

Not known.

Common Names

Not known.

Distribution Map

 
  • Native distribution
Found in
  • Asia-Tropical Papuasia Bismarck Archipelago
  • Pacific Northwestern Pacific Caroline Is.

  Bibliography

  • 1 J. Dransfield & N. Uhl & C. Asmussen & W.J. Baker & M. Harley & C. Lewis, Genera Palmarum. The evolution and classification of palms. 2008
  • 2 Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.

 Information From

Palmweb - Palms of the World Online
http://www.palmweb.org
Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet http://www.palmweb.org. Accessed on 21/04/2013
  • A Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
  • B http://creativecommons.org/publicdomain/zero/1.0
eMonocot
http://e-monocot.org
eMonocot. (2010, 1st November). Retrieved Wednesday, 8th February, 2012, from http://e-monocot.org.
  • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
World Checklist of Selected Plant Families
http://apps.kew.org/wcsp/
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://apps.kew.org/wcsp/ Retrieved 2011 onwards
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