Geonoma hollinensis A.J.Hend., Borchs. & Balslev, Brittonia 60: 195 (2008)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Ecuadorpresent
From 0°42-0°52'S and 77°26-77°40'W in Ecuador at 1125(1050-1200) m elevation in montane rainforest on eastern Andean slopes.
(Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • Taxonomic notes: - Geonoma hollinensis is one of only two species of Geonoma with staminate flowers with three stamens; G. triandra is the other. Lacking staminate flowers, it can also be recognized by its vestigial peduncular bracts and tricussately arranged flower pits.

    Subspecific variation: - There is no variation in any trait amongst the four specimens known.
    (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Plants 2.3(2.0-3.0) m tall; stems 1.9(1.5-2.2) m tall, 0.8(0.7-0.8) cm in diameter, clustered, cane-like; internodes 0.6(0.5-0.8) cm long, yellowish and smooth. Leaves 6(6-7) per stem, undivided, not plicate, bases of blades running diagonally into the rachis; sheaths 9.3(8.5-10.5) cm long; petioles 8.8(6.0-12.5) cm long, drying green or yellowish; rachis 25.0(23.5-26.7) cm long, 2.9(2.4-3.4) 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 31(26-38)° with the rachis; apical pinna 16.8(14.5-19.5) cm long, forming an angle of 27(22-30)° with the rachis. Inflorescences branched 2 orders; prophylls and peduncular bracts not ribbed with elongate, unbranched fibers, flattened, deciduous or persistent; prophylls 10.0(9.9-10.0) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 2.5 cm long, vestigial, inserted 2.2(0.9-3.4) cm above the prophyll; peduncles 11.1(9.5-12.7) cm long, 2.3(1.8-2.6) mm in diameter; rachillae 29(23-34), 8.5(8.2-8.8) cm long, 1.6(1.3-2.3) 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 tricussately arranged throughout the rachillae, the groups of pits closely spaced, glabrous internally; proximal lips without a central notch before anthesis, not recurved after anthesis, hood-shaped at anthesis, sometimes splitting postanthesis; 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 absent; staminate and pistillate petals not emergent, not valvate throughout; staminate flowers deciduous after anthesis; stamens 3; thecae diverging at anthesis, inserted almost directly onto the filament apices, the connectives bifid but scarcely developed; anthers short and curled over at anthesis; staminodial tubes crenulate or shallowly lobed at the apex, those of non-fertilized pistillate flowers not projecting, deciduous after anthesis; fruits 6.8 mm long, 5.0 mm in diameter, the bases without a prominent stipe, the apices not ovoid and conical apices, 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, smooth, without pores. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A