Barkeria whartoniana (C. Schweinf.) Soto Arenas
Epidendrum whartonianum (1948)
A scandent, deciduous herb with an epiphytic or rupicolous growth habit that grows to 70 cm. Roots: thickened, terete, long, fleshy, white in color with green tips. Stems: grayish-white, thickened, slightly compressed laterally with 3-11 internodes, 7-25 cm. in length. Older stems are covered with scarious, papery bracts. Leaves: 4-7 ensiform to narrowly ovate, acute, distichous, coriaceous to subsucculent, present only on the newly developing growth and appressed to the stem via an articulated joint. Inflorescence: terminal, erect, raceme or panicle with 1-5 branches and each branch with 2-15 flowers, from the new growth, on an elongated peduncle covered by tubular bracts (scarious at anthesis) 15-30 cm. in length. Flowers: Attractive, inodorous, 2.0-3.5 cm diameter spread, pinkish-lilac with a color intensity that varies from pale to saturated. The abaxial surfaces of the incurved tepals are darkened. The pink lip is paler than the tepals and darkens toward the apex. The dorsal surface of the subtrigonous, straight-incurved, column is greenish-white and profusely suffused with dark purple spots. The column is divergent and separated from the lip, dorsiventrally flattened into a spatulate shape with two prominent semi-elliptic column wings. The sepals are acute, elliptic to oblong-elliptic, reflexed and either flat or slightly convex at the apex. Petals are erect, acute to subacute, ovate-rhombic to elliptic-rhombic, thicker near the base and narrowing abruptly near the point of attachment. The lip is entire, fused basally to the column to form a cuniculus, triangular-cordate, margins faintly undulating, erect at the base and slightly reflexed at the apex so as to give the appearance of a raised tip. The callus is greenish-white or creamy-white with two oblong lamina that delimit a fovea, which converges into three raised longitudinal keels, becoming more elevated at the terminus and with the central one reaching all the way to the apex of the lip. The keels are brilliant, clear yellow with the apical third pigmented with purplish stripes either directly over the keels or parallel to it.