Pleurothallis madisonii Luer 1979 SUBGENUS Acianthera [Scheidw.] Luer 1986

TYPE Drawing by © Carl Luer and The Swiss Orchid Foundation at the Jany Renz Herbaria Website

Common Name or Meaning Madison's Pleurothallis [American discoverer of species]

Flower Size .2" [5 mm]

Found in Valle de Cauca department of Colombia and Carchi province of Ecuador in wet forests at elevations around 1600 to 2100 meters as a small to medium sized, cool to cold, shortly repent growing epiphyte with slender, ascending to erect, terete below, slightly compressed above ramicauls with a tubular sheath in the lower quarter and 1 to 2 others at the base and carrying a single, apical, erect, coriaceous, elliptical, obtuse, shortly acuminate, rounded and decurrent to the ramicaul base leaf that blooms in the fall on a congested, arising through a spathe at the apex of the ramicaul, distichous, 2" [5 cm] long including the .2 to .4" [.5 to 1 cm] long peduncle, simultaneously several flowered inflorescence with an infundibular, almost as long as the ovary floral bract.

"Similar vegetatively to P decurrens but characterized by the large leaf that is decurrent on the ramicaul. The short raceme emerges from the lower quarter of the blade. The sepals are fleshy, the petals are verrucosa within with a serrated crest within the apical margin and the lip is trilobed above the middle with a low, midline callus above the middle." Luer 2004

Synonyms Acianthera madisonii (Luer) Pridgeon & M.W.Chase 2001

References W3 Tropicos, Kew Monocot list , IPNI ;

*Selbyana 5(2): 171–172. Luer 1979;

Icones Pleurothallidinarum Vol III Systematics of Pleurothallis Luer 1986;

Lindleyana Vol 16 No 4:244 Pridgeon and Chase 2001 as Acianthera madisonii;

Icones Pleurothallidinarum Vol XXVI Pleurothallis subgenus Acianthera and Three Allied subgenera, A Second Century of new Species of Stelis of Ecuador, Epibator, Ophidion and Zootrophion Luer 2004

Icones Pleurothallidinarum Vol XXVI Pleurothallis subgenus Acianthera and Three Allied subgenera, A Second Century of new Species of Stelis of Ecuador, Epibator, Ophidion and Zootrophion Luer 2004 drawing fide;

Pleurothallids Neotropical Jewels Vol 1 Karremans & Viera 2020 as Acianthera madisonii photo fide;

Orquideas de Farallones de Cali Galindo-Tarazona, Haelterman, Zuluaga Trochez and Sebastian Moreno 2020 as Acianthera madisonii photo fide

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