Geonoma poiteauana

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Geonoma (geo-NO-mah)
poiteauana
(poy-toh-AHN-ah)
Geonoma macrostachys var poiteauana Camp Cisame Approuague infrutescence (4).JPG
Camp Cisame Approuague, French Guiana. Photo by Pierre-Olivier ALBANO.
Scientific Classification
Genus: Geonoma (geo-NO-mah)
Species:
poiteauana
(poy-toh-AHN-ah)
Synonyms
None set.
Native Continent
America
America.gif
Morphology
Habit: Solitary
Leaf type: Pinnate
Culture
Survivability index
Common names
None.

Habitat and Distribution

Brazil North, Colombia, French Guiana, Guyana, Suriname, and Venezuela.
Crique Grégoire, French Guiana. Photo by Pierre-Olivier ALBANO.
From 7°45'N-8°00'S and 47°10-70°11'W in the eastern and central Amazon region of the Guianas, Venezuela, Colombia, and Brazil, at 242(1-725) m elevation in lowland rainforest.

Description

Palms 1.2 (0.5-2.0) m tall; stems 0.1 m tall, 2.1 cm in diameter, branching no data, not cane-like; internodes 0.2 cm long, not scaly. Leaves undivided or irregularly pinnate, not plicate, bases of blades running diagonally into the rachis; sheaths 13.7 (12.0-17.0) cm long; petioles 21.6 (18.0-26.7) cm long, drying green or yellowish; rachis 57.0 (38.0-79.5) cm long, 4.2 (3.1-5.9) mm in diameter; adaxial veins not raised or slightly raised and triangular in cross-section adaxially; pinnae 2 (1-3) per side of rachis; basal pinna 51.8 (42.0-64.0) cm long, 16.6 (9.0-26.0) cm wide, forming an angle of 11 (5-22)° with the rachis; apical pinna 33.4 (30.0-38.0) cm long, 16.9 (9.5-31.5) cm wide, forming an angle of 18 (10-24)° 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 10.4 (6.0-13.2) cm long, not short and asymmetrically apiculate, the surfaces not ridged, without unequally wide ridges; peduncular bracts 23.4(19.0-28.35) cm long, well-developed, inserted 0.9 (0.5-2.0) cm above the prophyll; peduncles 80.2 (54.5-119.5) cm long, 2.9 (1.3-3.7) mm in diameter; rachillae 1, 13.2 (8.5-20.0) cm long, 4.8 (3.1-6.0) 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 or not diverging at anthesis, inserted onto well-developed, non-split, jointed connectives, connectives alternately long and short; anthers short at anthesis, remaining straight and parallel; 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 8.8 (7.9-9.5) mm long, 7.2 (6.4-8.0) mm in diameter, the bases without a prominent stipe, the apices not conical, 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.

Taxonomic notes: - Geonoma poiteauana was recognized by Henderson (1995) as a variety of Geonoma macrostachys, but is here recognized at the species level. The two are closely related, G. poiteauana differing by its fruits which are not bumpy and not apiculate. It belongs to a group of species within the G. macrostachys clade, comprising G. macrostachys, G. multisecta, G. paradoxa, and G. schizocarpa.

Subspecific variation: - Only one trait (leaf division) varies within this species. (Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.)/Palmweb.

Culture

Cold Hardiness Zone: 10a

Comments and Curiosities

Etymology: The specific epithet honors Dr. P.A. Poiteau, botanist.



External Links

References

Phonetic spelling of Latin names by edric.

Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.

Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.

Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).

Henderson, A.J. (2011) A revision of Geonoma. Phytotaxa 17: 1-271.


Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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