Geonoma santanderensis Galeano & R.Bernal, Caldasia 24: 282 (2002)

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Distribution

Map uses TDWG level 3 distributions (http://www.nhm.ac.uk/hosted_sites/tdwg/geogrphy.html)
Colombiapresent (World Checklist of Arecaceae)B
From 6°10-7°08'N and 72°54-73°27'W in the Eastern Cordillera in Colombia at 1800 m elevation in montane rainforest. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Discussion

  • Taxonomic notes: - Geonoma santanderensis was compared to G. monospatha by Galeano and Bernal (2002). However, it appears closely related to a group of species within the G. stricta clade comprising G. aspidiifolia and G. oligoclona. All three species share internodes covered with reddish or brownish scales, especially in their distal part, rachillae surfaces with spiky, fibrous projections or ridges, and staminodial tubes lobed at the apex with the lobes not spreading at anthesis and not acuminate. Geonoma santanderensis differs from G. aspidiifolia in its fruits which are bumpy from the numerous, subepidermal, tangential, short fibers present; and from G. oligoclona in its prophyll which is not short and asymmetrically apiculate.

    Subspecific variation: - No traits, except for stem branching, vary within this species. The specimens come from two separate areas, but there are too few specimens to test for differences between these. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A

Description

  • Plants height no data; stems 1.3(1.0-1.5) m tall, 0.8(0.6-0.9) cm in diameter, solitary or clustered, cane-like; internodes 1.5(1.0-2.2) cm long, covered with reddish or brownish scales, especially in their distal part. Leaves 9(7-12) per stem, irregularly pinnate, not plicate, bases of blades running diagonally into the rachis; sheaths 8.0(6.0-11.0) cm long; petioles 15.9(8.0-29.0) cm long, drying green or yellowish; rachis 20.5(15.5-25.0) cm long, 1.6(1.4-2.2) mm in diameter; veins not raised or slightly raised and triangular in cross-sectionadaxially; pinnae 5(3-6) per side of rachis; basal pinna 10.7(9.7-11.5) cm long, 1.1(0.8-1.8) cm wide, forming an angle of 60(45-72)° with the rachis; apical pinna 8.2(7.0-10.0) cm, 7.5(6.3-11.0) cm wide, forming an angle of 42(38-48)° with the rachis. Inflorescences unbranched; prophylls and peduncular bracts not ribbed with elongate, unbranched fibers, flattened, deciduous or persistent; prophylls 8.5(6.7-11.2) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges;-peduncular bracts 7.3(5.9-10.5) cm long, well-developed, inserted 1.1(0.5-2.3) cm above the prophyll;-peduncles 8.7(6.0-14.5) cm long, 2.1(1.5-2.8) mm in diameter; rachillae 1, 8.4(5.7-10.0) cm long, 3.4(2.6-4.1) 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 usually 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, 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 onto bifid and well-developed, non-jointed connectives; 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 8.5(7.8-9.9) mm long, 6.0(4.6-7.2) 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, smooth, without pores. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)A