D'Orbigny's Shadowpalm

The Essence

"Geonoma orbignyana is a slender understorey palm of Andean and Central American montane rain forest, described in the ecological literature as a common understorey palm. Plants average about 2 m tall (0.5-7.0 m), on a thin stem only around 1.2 cm in diameter, solitary or clustered, carrying roughly ten leaves that may be undivided, irregularly pinnate, or sometimes regularly pinnate. Plants of the World Online gives the native range as Central America to Bolivia and accepts two subspecies, subsp. hoffmanniana and subsp. orbignyana. It is also a notoriously difficult taxon. Henderson's 2011 revision of Geonoma places it in the high-elevation Andean G. undata clade alongside G. lehmannii, G. talamancana, G. trigona and G. undata, and reports that G. lehmannii, G. orbignyana and G. undata are difficult to distinguish from one another and extremely complex internally. Henderson treats G. jussieuana as a synonym of subsp. orbignyana, and within that subspecies recognises a series of named regional morphotypes - lindeniana in the Venezuelan Andes, pumila in the Sierra Nevada de Santa Marta, linearifolia in the central Eastern Cordillera, plicata in the Central and Western Cordilleras and wilsonii in Caqueta - while flagging several Eastern Cordillera specimens as possible hybrids with the weberbaueri morphotype of G. undata subsp. undata. He also notes a distributional gap in eastern Panama separating Central American from South American specimens. The IUCN Red List lists the species as Least Concern, assessed in 2018 and published in 2023."

The leaves have been harvested as cut foliage in Colombia for more than 30 years, making this a non-timber forest product of genuine economic interest. Rodriguez-Buritica, Orjuela & Galeano (2005) monitored more than 1,600 palms between June 1999 and March 2000 and found that the species grows at 1.98 +/- 0.047 leaves per year, has a long lifespan, and belonged to a growing population (lambda = 1.074, CI 1.046-1.099), with survival transitions accounting for 77% of population growth. They describe it as a promising non-timber forest product, but recommend that harvesting regimes consider recovery time and forest dynamics: without those considerations mortality could increase in all classes, compromising population persistence. Palmweb's use records report the stem used for walking sticks in Ecuador (Borchsenius, Borgtoft-Pedersen & Balslev 1998) and the fruit eaten as human food (Aguirre et al. 2003); POWO records that the species has social uses and uses for food.