A revision of Geonoma (Arecaceae) Author Henderson, Andrew text Phytotaxa 2011 2011-02-18 17 1 271 journal article 24911 10.11646/phytotaxa.17.1 65962ba7-eec1-40e7-aed6-cef94e99ca39 1179-3163 3538362 9. Geonoma chlamydostachys Galeano (1986: 71) . Type: COLOMBIA . Antioquia : Mun. San Luis, Río Claro, 400–1000 m , 13 January 1983 , A. Hernández et al. 685 ( holotype HUA n.v. ). FIGURE 11 . Distribution maps of Geonoma calyptrogynoidea , G . camana , G . chlamydostachys , G . chococola subsp. chococola , and G . chococola subsp. awaensis . 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 filament apices; 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. Distribution and habitat:— 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 ( Fig. 11 ). 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.