Geonoma sanmartinensis A.J.Hend., Phytotaxa 17: 134 (2011)

Primary tabs

no image available

Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
From 5°45-5°54'S and 77°21-77°45'W in Andean regions of Peru (San Martín) at 1525(1250-1850) m elevation in montane rainforest. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • Taxonomic notes: - Geonoma sanmartinensis appears most similar to G. brongniartii. It differs in its fruits which are bumpy from the numerous, subepidermal, tangential, short fibers present.

    Subspecific variation: - No trait varies within this species, nor is there any geographic disjunction. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Plants 1.2(0.5-2.0) m tall; stem branching no data; stem type no data; stem height no data; stem diameter no data; internode color no data; internode length no data. Leaves irregularly pinnate, not plicate, bases of blades running diagonally into the rachis; sheaths no data; petioles drying green or yellowish; rachis 38.6(35.8-41.0) cm long, 3.2(2.3-4.0) mm in diameter; veins raised and rectangular in cross-section adaxially; pinnae 4(3-7) per side of rachis; basal pinna 28.1(27.0-29.5) cm long, 4.3(0.9-6.8) cm wide, forming an angle of 46(30-60)° with the rachis; apical pinna length no data, 12.3(9.2-15.0) cm wide, forming an angle of 27(22-32)° 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 12.6(11.0-14.2) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 23.0(16.0-30.0) cm long, well-developed; inserted 1.1(0.8-1.4) cm above the prophyll; peduncles 63.5(63.0-64.0) cm long, 2.9(2.6-3.1) mm in diameter; rachillae 1, 21.1(18.5-24.7) cm long, 3.6(3.1-3.9) mm in diameter, the surfaces with 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 without a central notch before anthesis, not recurved after anthesis, hood-shaped at anthesis, sometimes splitting post-anthesis; 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 a scarcely raised rim; 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, those of non-fertilized pistillate flowers not projecting and persistent after anthesis. Fruits size no data, 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, smooth, without pores. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A