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 15. Geonoma deneversii Henderson , sp. nov. (Appendix IV, Plates 21–24) A speciebus affinibus staminibus plus quam sex differt. Type: PANAMA . Bocas del Toro : E of Gualaca-Chiriquí Grande road, 10 mi. N of continental divide, 1 mi. along side road E, 8°55’N 82°05’W , 100–500 m , 19 January 1989 , G. de Nevers, F. Almeda & G. McPherson 8823 ( holotype NY!, isotypes BH!, K!, MO!). Plant height no data; stems 1.3 m tall, solitary; internodes no data. Leaves 20 per stem, irregularly pinnate, not plicate, bases of blades running diagonally into the rachis; sheaths no data; petioles drying green or yellowish; rachis 104.5 cm long, 5.4 mm in diameter; veins raised and rectangular in cross-section adaxially; pinnae 3 per side of rachis; basal pinna 87.0 cm long, 18.7 cm wide, forming an angle of 31° with the rachis; apical pinna 25.5 cm long, 27.5 cm wide, forming an angle of 27° 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 35.5 cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 31.0 cm long, well-developed, inserted 2.7 cm above the prophyll; peduncles 92.5 cm long, 5.2 mm in diameter; rachillae 1, 31.0 cm long, 9.9 mm wide, 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 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 well-developed; staminate and pistillate petals not emergent, not valvate throughout; staminate flowers deciduous after anthesis; stamens more than 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; staminodial tubes projection no data; fruits no data. Distribution and habitat:— At 8°55’N and 82°05’W on the Caribbean slope in Panama ( Bocas del Toro ) at 250 m elevation in lowland rainforest ( Fig. 15 ). Taxonomic notes:— Geonoma deneversii differs from similar species ( G. camana , G. chlamydostachys , G. chococola ) in its staminate flowers with more than six stamens. It is also the only species of this group to occur in Central America. Subspecific variation:— No trait varies within this species, and only one specimen is known.