Geonoma chlamydostachys Galeano-Garcés, Principes 30: 71 (1986)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Colombiapresent (World Checklist of Arecaceae)B
From 7°18-5°33'N and 74°18-75°36'W in the Central Cordillera in Colombia (Antioquia), with an outlier in the Eastern Cordillera, at 890(550-1450) m elevation in lowland to montane rainforest.
(Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • Taxonomic notes: - Geonoma chlamydostachys differs from similar species in the G. macrostachys clade (G. camana, G. chococola, G. deneversii, and G. maxima) in its 6 stamens; thecae diverging at anthesis and inserted directly onto the apiculate filament apices; and fruit surfaces not splitting.

    Subspecific variation: - No traits vary within this species, nor is there any geographic discontinuity. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Plants 1.8(1.0-3.0) m tall; stems 1.4(0.6-2.5) m tall, solitary. Leaves irregularly pinnate, not plicate, the bases of blades running diagonally into the rachis; sheaths 19.0 cm long; petioles 8.0 cm long, drying green or yellowish; rachis 44.6(36.5-57.0) cm long, 4.3(2.8-6.0) mm in diameter; veins not raised or slightly raised and triangular in cross-section adaxially; pinnae 5(3-9) per side of rachis; basal pinna 33.8(22.0-41.0) cm long, 11.6(1.8-17.0) cm wide, forming an angle of 32(23-43)° with the rachis; apical pinna 17.0(12.5-23.0) cm long, 11.7(8.4-14.5) cm wide, forming an angle of 38(32-45)° with the rachis. Inflorescences unbranched; prophylls and peduncular bracts ribbed with elongate, unbranched fibers, both bracts tubular, narrow, elongate, closely sheathing the peduncle, more or less persistent; prophylls 7.4(5.0-9.0) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 27.4(25.0-33.5) cm long, well-developed, inserted 0.6(0.4-0.9) cm above the prophyll; peduncles 43.2(36.2-49.0) cm long, 3.3(2.6?3.8) mm in diameter; rachillae 1, 17.9(14.5-26.4) cm long, 5.9(4.8-7.1) 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 with a central notch before anthesis, often the two sides of the notch overlapping, not recurved after anthesis, not hooded; 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 well-developed; staminate and pistillate petals not emergent, not valvate throughout; staminate flowers deciduous after anthesis; stamens 6; thecae diverging at anthesis, inserted directly onto the apiculate filamentapices; anthers not short and curled at anthesis, usually elongate, spiraled and twisted or sometimes remaining straight; non-fertilized pistillate flowers deciduous after anthesis; staminodial tubes lobed at the apex, the lobes spreading at anthesis, acuminate, those of non-fertilized flowers not projecting and persistent after anthesis; fruits 12.3 mm long, 9.2 mm in diameter, the bases without a prominent stipe, the apices not conical, the surfaces not splitting at maturity, without fibers emerging, not bumpy, not apiculate; locular epidermis with operculum, smooth, with pores. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A