Geonoma umbraculiformis (Geonoma umbraculiformis)

Description

Palms 1.9 (1.8-2.3) m tall; stems 1.5 (0.7-2.0) m tall, 1.7 cm in diameter, cane-like; internodes 1.2 cm long, yellowish and smooth. Leaves 16 (12-22) per stem, undivided or irregularly pinnate, not plicate, bases of blades recurved against the rachis; sheaths 21.0 (20.0-22.0) cm long; petioles 3.8 (0.0-10.5) cm long, drying green or yellowish; rachis 75.9 (63.0-90.0) cm long, 5.0 (3.1-7.9) mm in diameter; veins not raised or slightly raised and triangular in cross-section adaxially; pinnae 3(1?4) per side of rachis; basal pinna 45.0 (40.5-51.0) cm long, 27.6 (21.0-39.0) cm wide, forming an angle of 16 (9-22)° with the rachis; apical pinna 31.0 (15.0-25.3) cm long, 18.3 (15.5-21,5) cm wide, forming an angle of 31 (28-37)° with the rachis. Inflorescences branched 1 order; prophylls and peduncular bracts not ribbed with elongate, unbranched fibers, flattened (if tubular, narrow, and elongate then not ribbed), deciduous or persistent; prophylls 13.9(13.0-15.0) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 28.8(23.0?34.5) cm long, well-developed, inserted 4.4 (3.0-5.7) cm above the prophyll; peduncles 35.4 (31.0-40.5) cm long, 3.9 (2.5-5.0) mm in diameter; rachillae 4 (3-6), 17.4 (12.0-23.5) cm long, 3.3 (2.7-4.2) 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 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 6; thecae diverging at anthesis, inserted directly onto 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 pistillate flowers not projecting and persistent after anthesis; fruits 12.6 (12.0-13.0) mm long, 10.3(9.7-11.0) mm in diameter, the bases without a prominent stipe, 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.)/Palmweb. Editing by edric.