Geonoma trigona (Ruiz & Pav.) A.H.Gentry
  • Ann. Missouri Bot. Gard. 73: 161 (1986) 

Notes: Distribution: S. Ecuador, C. Peru

General Description

Plants 2.9(1.5-4.0) m tall; stems 3.0 m tall, in diameter no data, solitary; internodes no data. Leaves 6 per stem, undivided, plicate, bases of blades running diagonally into the rachis; sheaths 17.9(15.0-20.7) cm long; petioles 7.1(3.0-9.0) cm long, drying green or yellowish; rachis 18.3(11.7-32.0) cm long, 6.3(4.9-7.6) mm, in diameter; veins raised and rectangular in cross-section adaxially; pinnae 1 per side of rachis; basal pinna length and width not applicable, forming an angle of 17(10-27)° with the rachis; apical pinna 22.9(18.0-26.0) cm long, width not applicable, forming an angle of 17(11-23)° with the rachis. Inflorescences branched 1-2 orders; prophylls and peduncular bracts not ribbed with elongate, unbranched fibers, flattened (if tubular, narrow, and elongate then not ribbed), deciduous or persistent; prophylls 36.2(27.5-43.0) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 27.0 cm long, well-developed, inserted 18.7 cm above the prophyll; peduncles 46.4(38.0-61.0) cm long, 7.4(6.4-8.7) mm in diameter; rachillae 10(9-11), 14.2(11.3-19.4) cm long, 5.0(4.0-5.6) mm in diameter, the surfaces without spiky, fibrous projections or ridges, drying brown or yellow-brown, without short, transverse ridges, not filiform and not narrowed between the flower pits; flower pits spirally arranged, glabrous internally; proximal lips apiculate and lobed before anthesis, tearing in the center after anthesis, not recurved after anthesis, not hood-shaped; proximal and distal lips drying the same color as the rachillae, not joined to form a raised cupule, the proximal lip margins overlapping the distal lip margins; distal lips absent; staminate and pistillate petals not emergent, not valvate throughout; staminate flowers deciduous after anthesis; stamens 6; thecae diverging at anthesis, inserted almost directly onto the filament apices, the connectives bifid but scarcely developed; anthers short and curled over at anthesis; non-fertilized pistillate flowers persistent after anthesis; staminodial tubes crenulate or shallowly lobed at the apex, those of non-fertilized pistillate flowers not projecting and persistent after anthesis; fruits 9.0 mm long, 6.5 mm in diameter, the bases with a prominent, asymmetric stipe, the apices not conical, the surfaces not splitting at maturity, without fibersemerging, bumpy from the numerous, subepidermal, tangential, short fibers present, these coming to a point at fruit apices; locular epidermis without operculum, smooth, without pores.


From 3°27-11°35'S and 75°37-78°22'W on eastern Andean slopes in Ecuador and Peru at 2698(2090-3000) m elevation in pajonal or dwarf forest.

Distribution Map

  • Native distribution
Found in
  • Southern America Western South America Ecuador
  • Peru


  • 1 Henderson, A. (2011). A revision of Geonoma (Arecaceae). Phytotaxa 17: 1-271.
  • 2 Henderson, A.J., A revision of Geonoma in Phytotaxa 17. 2011
  • 3 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
Palmweb 2011. Palmweb: Palms of the World Online. Published on the internet Accessed on 21/04/2013
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WCS higher taxonomy
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World Checklist of Selected Plant Families
WCSP 2014. 'World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; Retrieved 2011 onwards
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