Pleurothallis rikseniana Mark Wilson & B.T. Larsen 2022 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859
Photo A; by © Joost Riksen Photo B; by © Mark Wilson/TYPE Drawing By © Bruno Larsen and Harvard Papers in Botany Vol. 27, No. 2 New species of Pleurothallis (Orchidaceae: Pleurothallidinae), a new country record, AND labellar morphology in the P. cardiostola-P. lilijae complex of subsection Macrophyllae-Fasciculatae Mark Wilson, Bruno Larsen, Juan Sebastián Moreno, Raven Ward, Joost A. G. Riksen,Luis Piña, Mario A. Sierra-Ariza, Marco M. Jiménez, Milton Rincón-Gonzalez, Robinson Galindo-Tarazona, Henry Garzón Suárez, and David Haelterman 2022
Common Name Riksen's Pleurothallis [Dutch Orchid Collector and Cultivator current]
Flower Size .24" [6 mm]
Found in ?southeastern Ecuador? without locational data as a small sized, caespitose epiphyte with erect, slender, terete ramicauls enclosed by a tubular, papery basal sheath, and a tightly adpressed, tubular sheath below the middle and carrying a single, apical, horizontal to acutely deflexed, coriaceous, narrowly-ovate, acute, deeply cordate below into the sessile base leaf that blooms on an erect, short, rarely in pairs, from an oblique spathe at the base of the leaf, peduncle .08" [2 mm] long, a fascicle of successively single, few flowered inflorescence with a shorter than the pedicel floral bract and carrying non-resupinate flowers.
"Part of the Pleurothallis cardiostola/Pleurothallis lilijae complex. Pleurothallis rikseniana is most similar to P. lilijae but can be easily distinguished by the lip length (.1 to .108" [2.5–2.7 mm] long in P. rikseniana versus ca. .152" [3.8 mm] long in P. lilijae); shape (ovate-short triangular in P. rikseniana versus narrowly ovate in P. lilijae; concavity (deeply concave in P. rikseniana versus shallowly concave in P. lilijae); and presence/absence of labellar sulcus (glenion continuous with deep, linear sulcus in P. rikseniana versus distinct, circular glenion and no sulcus)." Mark Wilson & B.T. Larsen 2022
Synonyms
References W3 Tropicos, Kew Monocot list , IPNI ;
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