Geonoma gentryi A.J.Hend., Phytotaxa 17: 78 (2011)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
At 5°16'N and 76°37'W on the Pacific coast of Colombia (Chocó) at 150 m elevation in lowland rainforest. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • Taxonomic notes: - Geonoma gentryi is a member of the G. lanata clade, within which it appears most similar to G. spinescens. Both these species lack data for some prophyll characters, but given its wide geographic separation and different habitat (lowland rainforest at 150 m in the Chocó versus lowland or montane rainforest at 1075(800-1330) m in the Coastal Range in Venezuela), G. gentryi is recognized as a distinct species.

    Subspecific variation: - No trait varies within this species, and only one specimen is known. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Plants 1.5 m tall; stems height no data, 0.8 cm in diameter, branching no data, cane-like; internodes 2.9 cm long, yellowish and smooth.
    Leaves undivided, not plicate, bases of blades running diagonally into the rachis; sheaths 6.0 cm long; petioles 12.0 cm long, drying green or yellowish; rachis 26.0 cm long, 2.4 mm in diameter; veins not raised or slightly raised and triangular in cross-section adaxially; pinnae 1 per side of rachis; basal pinna length and width not applicable, forming an angle of 25° with the rachis; apical pinna 11.6 cm long, width not applicable; forming an angle of 28° with the rachis .
    Inflorescences branched 2 orders; prophylls and peduncular bracts not ribbed with elongate, unbranched fibers, flattened, deciduous or persistent; prophylls length no data, not short and asymmetrically apiculate, surfaces no data; peduncular bracts length no data, well-developed, inserted 2.4 cm above the prophyll; peduncles 18.7 cm, 3.1 mm in diameter; rachillae 12, 5.3 cm long, 2.0 mm in diameter, the surfaces without spiky, fibrous projections or ridges, drying brown, with faint to pronounced, short, transverse ridges, not filiform and not narrowed between the flower pits; flower pits spirally arranged, glabrous internally; proximal lips without a central notch before anthesis, not recurved after anthesis, not hood-shaped; proximal and distal lips drying the same color as the rachillae, joined to form a raised cupule, the margins not overlapping; 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 almost directly onto the filament apices, the connectives bifid but scarcely developed; anthers short and curled over at anthesis; non-fertilized pistillate flowers deciduous after anthesis; staminodial tubes crenulate or shallowly lobed at the apex; staminodial tubes of non-fertilized pistillate flowers not projecting and persistent after anthesis.
    Fruits 8.6 mm long, 5.7 mm in diameter, the bases without a prominent stipe, the apices not conical, the surfaces not splitting at maturity, without fibers emerging, bumpy from the numerous, subepidermal, tangential, short fibers present, these coming to a point at fruit apices; locular epidermis without operculum. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A