A new species of epidendrum (Laeliinae) of the incomptum group from the north of Antioquia, Colombia

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Resumen

Se describe e ilustra una especie nueva de Epidendrum del grupo Incomptum, hasta ahora encontrada solamente de la localidad tipo. Se proporciona información para separar las especies pertenecientes a los grupos Arbuscula e Incomptum. Además, el nuevo taxón descrito aquí, Epidendrum pembertonii, se compara minuciosamente con las cuatro especies morfológicamente más similares (E. brenesii, E. bisulcatum, E. foldatsii, E. sotoanum), mostrando diferencias notables en la cantidad y forma de las hojas, longitud de la inflorescencia, color de las flores, venación de los sépalos, forma y ornamentación del labelo y columna.

Palabras clave: Alto de Ventanas; Arbuscula group; Epidendrum brenesii; Epidendrum pembertonii; Yarumal

Group/Character	Arbuscula	Incomptum
Inflorescence	Racemose, lax, > 12.5 cm long	Racemose, compact, < 12 cm long
Floral bract	4-30 mm long	3-7 mm long
Flower texture	Membranaceous	Fleshy
Number of flowers	> 20	< 15 (except in E. molinae > 40)
Ovary (length)	0.9-6.0 cm	1.0-2.0 cm

	*E. bisulcatum*	*E. brenesii*	*E. foldatsii*	*E. pembertonii*	*E. sotoanum*
Country	Costa Rica Panama	Costa Rica	Venezuela	Colombia	Costa Rica
Leaves number, shape, measures)	2-4, oblong, 6.0-9.0 × 1.4-2.2 cm	3-5, oblong, 2-8 × 1.3-2.5 cm	2-4, obovate-elliptic, 2.0-4.5 × 1.1-1.7 cm	2, elliptic, 5.2-6.0 × 2.5-2.7 cm	3, obovate-elliptic, 5-10 × 1.3-2.5 cm
Inflorescence (length)	3.8 cm	2-4 cm	2 cm	7.2 cm	2 cm
Tepals (color)	Live-green	Light green with purple tinge to deep purple	Unregistered	Yellow-greenish tinge brown	Greenish brown or yellow
Lip (color)	Lighter with a purple cast over it	Light green with purple tinge to deep purple	Unregistered	Red with the calli yellow to red	Greenish brown or yellow
Column (color)	Yellow-greenish	Green	Unregistered	Yellow-greenish, slightly tinge reddish brown, anther yellow	Green, darker at the base
Ovary (length)	10-11 mm	8-13 mm	5-7 mm	12-15 mm	12-20 mm
Cuniculus nectary	Shallow, slightly penetrating ovary, narrow, smooth	Penetrating somewhat the ovary, smooth	Unregistered	Shallow, slightly penetrating ovary, narrow, smooth	Short, without penetrating the ovary, smooth
Dorsal sepal (shape, length, number of veins)	Oblong, 12-15 × 6.0-6.5 mm, 3-veined	Obovate-elliptic, 12-13 × 6.0-6.5 mm, 3-veined	Elliptic, 4.5-5.0 × 2.5 mm, 3-veined	Narrowly obovate, sub-rounded, 13.5 × 6.0 mm, 5-veined	Obovate-elliptic, 12-16 × 4.0-7.5 mm, 3-4 veined
Lateral sepals (shape, length, number of veins)	Oblong, 12-15 × 6.0-6.5 mm, 5-veined apparently	Obovate-elliptic, 14.5-15.0 × 7.5 mm, 3-veined	Obliquely ovate, 5 × 2.8 mm, 3-veined	Obliquely elliptic, 13.1 × 7.5 mm, 5-veined	Obovate-elliptic, 13-18 × 7-9 mm, 3-4 veined
Petals (shape, length, number of veins)	Linear-spathulate, 11-12 × 2.5 mm, 3-veined	Linear-oblanceolate, 12 × 2.5-3 mm, 3-veined	Linear-oblanceolate, 4.5 × 1 mm, 1-veined	Oblanceolate, 13.5 × 4.2 mm, 3-veined	Narrowly-obovate, spreading, 11-15 × 2-4 mm, 3-veined
Lip (shape, surface, measures)	Suborbicular, surface unregistered 9.0-10 × 11.0-12.5 mm	Reniform, velutinous, short setose, densely covered by short, pointed trichomes. 8-12 × 15-19 mm	Obreniform, surface unregistered, 4 × 7.5 mm	Reniform, smooth, 9-12 × 15.2-17.0 mm	Widely reniform, superficially glabrous in appearance but with low rounded papilla. 10-17 × 20-30 mm
Callus and keels	Bicallose, callus laminar, short, with 3 low keels in front, the central keel running to the apex of the lip, the lateral ones short	Bicallose, callus formed by a pair of short, laterally compressed thickenings; disc with a low, wide keel that reaches the apical sinus	Bicallose, callus divergent in front of the column, with a fleshy, rounded keel running down the middle without reaching the apical sinus	Bicallose, callus globose, slightly separate; disc with a thick, low rib running at apex, reaching apical sinus of lip	Bicallose, callus thickened at the base and ending in a pair of low keels
Lip apex (shape)	Retuse to rounded	Emarginate, the apex sometimes slightly 4-lobed	Deeply emarginate	Emarginate, apiculate	Deeply emarginate
Column (shape, length)	Slightly arched upward, 7.0-8.0 mm long	Arching downwards, 7-8 mm long	Slightly sigmoid, 3 mm long	Straight, apex arching upwards, 9-10 mm long	Somewhat arching downwards, 7-8 mm long

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Lankester Botanical Garden, University of Costa Rica Jardín Botánico Lankester, Cartago, Cartago, Costa Rica, CR, 302-7050, 25117949, 25117931 - E-mail: franco.pupulin@ucr.ac.cr

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