Pupulin, F. 2004. Novelties in Mesoamerican Kefersteinia (Orchidaceae: Zygopetalinae). Harvard Pap. Bot. 8(2): 161-170.

Abstract
Three new species of Kefersteinia from Guatemala and Panama are described and illustrated. Kefersteinia alata is closely related to K. costaricensis but differs in the larger size of the plant, the narrow, elliptic sepals, the erect petals incurved along the column, the rounded apex of the lip, and the distinctly longer tooth under the column. Among the species of sect. Umbonatae, K. angustifolia may be recognized by its very narrow linear leaves, the proportionately small petals, and the peculiar spatulate-flabellate lip. Kefersteinia tinschertiana is a member of sect. Kefersteinia, differing from other species of the K. lactea group in the deeply bilobed apex of lip, the high laminar callus, and the peculiar ornamentation of the column. Kefersteinia elegans is first recorded and illustrated for the flora of Panama. A key is provided for the species of Kefersteinia in Mesoamerica.

Key words
Orchidaceae, Zygopetalinae, taxonomy, Kefersteinia, Kefersteinia alata, Kefersteinia angustifolia, Kefersteinia elegans, Kefersteinia tinschertiana, Costa Rica, Guatemala, Panama.

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