Pleurothallis tridentata Klotzsch 1840 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859

Flower Closeup Photos by Francis J Quesada-Pallares

Another Plant Photo by Pieter C. Brouwer and his Nature Photo Website

Another Plant Photo by S Manning and The Swiss Orchid Foundation at the Jany Renz Herbaria Website

Common Name The Three Toothed Pleurothallis [refers to the leaf apex]

Flower Size .1" [3 mm]

Found in Venezuela, Colombia, Ecuador, Peru? and Bolivia? in rainforests at elevations of 400 to 2000 meters as a mini-miniature to small sized, hot to cool growing epiphyte with slender, erect to ascending ramicauls enveloped by a close, tubular sheath below the middle and another at the base and carrying a fascile of single, apical, suberect to spreading, coriaceous, narrowly ovate, acute, rounded, shallowly cordate, sessile leaf that blooms in the spring, summer and fall on a short [1 to 2 mm] long, successively single flowered inflorescence subtended by a spathe and carrying a non-resupinate flower

CAUTION It seems that this is a very variable flowered orchid but still I am not happy with either of these two determinations, the first and second photos[More like P nephrocardia] are more correct as it has a single flower but according to Luer the colors are wrong and the petals are not reflexed. The third has a fascile of flowers all open at the same time [More like P ionantha] and Luer states that it is a fascile of successive single flowers but the colors are more correct and the petals are reflexed. The fourth is the most like the description by Luer. Can anyone out there sort these out? I get the impression that these several species [P ionantha, P nephrocardia and P tridentata] have been kept separate and have only been united of late as they have found intermediary specimens sharing the traits of both parents.

Synonyms Acronia tridentata (Klotzsch) Luer 2005; Humboldtia tridentata (Klotzsch) Kuntze 1891; Pleurothallis ionantha Rchb.f. 1850; Pleurothallis nephrocardia Schltr. 1919; Zosterophyllanthos ionanthus (Rchb.f.) Szlach. & Marg. 2001; Zosterophyllanthos nephrocardius (Schltr.) Szlach. & Marg. 2001; Zosterophyllanthos tridentatus (Klotzsch) Szlach. & Marg. 2001

References W3 Tropicos, Kew Monocot list IPNI ; Xenia Orchidaceae Vol 3 Reichenbach 1896 drawing fide; Die Orchideen der Sudamerikanischen Kordillerenstaaten I Venezuela Schlechter 1919 as P nephrocardia; Venezuelan Orchids Illustrated Vol 1 Dunsterville & Garay 1959 as Pleurothallis ionantha drawing fide to the third photo; Orchids of Peru Vol 2 Schweinfurth 1959; Venezuela Orchids Illustrated Vol 2 Dunsterville & Garay 1961 drawing fide; Venezuelan Orchids Vol 4 Dunsterville & Garay 1966 as Pleurothallis nephrocardia drawing fide; Flora Of Venezuela Volumen XV Parte 2 Foldats 1970 drawing fide; Orchids of Venezuela, An Illustrated Field Guide Vol 3 Dunsterville & Garay 1979 as P ionantha drawing fide to the third photo; Orchids of Venezuela, An Illustrated Field Guide Vol 3 Dunsterville & Garay 1979 as P nephrocardia drawing fide; Orchids of Venezuela, An Illustrated Field Guide Vol 3 Dunsterville & Garay 1979 drawing fide; Miniature Orchids Northen 1980 photo ok; Icones Pleurothallidinarum III Systematic of Pleurothallis Luer 1986; Orchids of Venezuela [An illustrated field guide] Vol. 3 Ramiro and Carnevali 2000 as P ionantha drawing fide to the third photo; Orchids of Venezuela [An illustrated field guide] Vol. 3 Ramiro and Carnevali 2000 as P nephrocardia drawing fide to the 1 and 2nd photos; Orchids of Venezuela [An illustrated field guide] Vol. 3 Ramiro and Carnevali 2000 drawing fide; Orchids of Bolivia Vol 1 Ibisch & Vasquez 2000; Flora of the Venezuelan Guayana Vol 7 Steyermark, Berry, Yatskievych and Holst 2003; Icones Pleurothalidinarum vol XXVII Acronia Luer 2005 drawing fide as Acronia tridentata; Mille et Une Mini Orchideees Roguenant 2009 photo good;

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