Geonoma chlamydostachys Galeano (1986: 71)

Henderson, Andrew, 2011, A revision of Geonoma (Arecaceae), Phytotaxa 17, pp. 1-271 : 46-48

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.).

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.

Figures

FIGURE 11. Distribution maps of Geonoma calyptrogynoidea, G. camana, G. chlamydostachys, G. chococola subsp. chococola, and G. chococola subsp. awaensis.