Thursday, June 14, 2018

[Botany • 2018] Pleurothallis hawkingii & P. vide-vallis (Orchidaceae; Epidendroideae) • Two New Species from Cordillera de Guanacaste in Costa Rica

Pleurothallis hawkingii Karremans & J.E.Jiménez

in Karremans & Jiménez, 2018.


Two new species of Pleurothallis are described from the Cordillera de Guanacaste in northern Costa Rica. Both novelties belong to Pleurothallis sect. Macrophyllae-Fasciculatae, among which they can be recognised by their fasciculate inflorescence with numerous simultaneously produced flowers, a rare feature in the species-rich group. This feature is shared with Pleurothallis bothros, putatively their closest relative. Both novelties may be distinguished from that species by their non-spreading (vs. spreading), pale yellow to pinkish flowers (vs. green) and broad, oblique petals (vs. narrow, straight). Pleurothallis hawkingii can be easily distinguished from Pleurothallis vide-vallis by its broader panduriform lip with raised margins and depressed basal glenion (vs. narrow lanceolate lip, lacking raised margins, with the glenion raised on a high basal callus).

Keywords: Monocots, Northern Costa Rica; Miravalles; new species; Pleurothallis; Stephen Hawking; taxonomy

Pleurothallis hawkingii Karremans & J.E.Jiménez  sp. nov.

 Eponomy:— Honouring the English theoretical physicist, cosmologist and author Stephen William Hawking, who passed away the day this manuscript was submitted, 14 March 2018.


Pleurothallis vide-vallis Karremans & J.E.Jiménez, sp. nov.

 Etymology:—From the Latin, videre, to see, and vallis, valley, referring to the Miravalles Volcano, which in Spanish means overlooking the valleys.

Adam P. Karremans and José Esteban Jiménez. 2018. Pleurothallis hawkingii and Pleurothallis vide-vallis (Orchidaceae; Epidendroideae), Two New Species from Cordillera de Guanacaste in Costa Rica. Phytotaxa. 349(2); 185–191. DOI:  10.11646/phytotaxa.349.2.10

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