Materials to the Orchid Flora of Colombia. Vol. 4: Dariusz L. Szlachetko, Marta Kolanovska, Paul Ormerod, Magdalena Dudek, Pzemyslaw Baranov and Ruben P. Sauleda: Epidendroideae, part 1. 2023.628 b/w line drawings. 93 col. dot maps. 497 colored photographs on plates. 792 p. 4to. Hardcover.(ISBN 978-3-946583-47-9)

This volume covers Bletieae (Subtribe Bletiinae: Bletia and Calanthe)/ Malaxideae ( Subtribe Malaxidinae:Crossoglossa, Liparis, Crossoliparis, Malaxis, Microstylis)/ Dendrobieae (Subtribe Bulbophyllinae: Bulbophyllum)/ Elleantheae (Subtribe Xerorchidinae: Xerorchis; Elleanthinae: Sertifera, Elleanthus, Evelyna, Adeneleutherophora, Epilyna; Arpophyllinae : Arpophyllum)/ Epidendreae (Chysiinae:Chysis; Coeliinae: Coelia; Laeliinae (Homolopetalum, Caularthron, Isochilus, Prosthechea, Hormidium, Anacheilium, Psudencylia, Panarica, Oesthundia, Encyclia, Guarianthe, Cattleya, Myrmecophila, Schomburgkia, Brassavoa, Javieria) / References/ Index to Scientific Names/ Index to the Numbered collections cited / Maps / Plates.

Volumes 5 & 6 will cover Epidendrum by E. Hagsater. Volume 5 expected late 2024. Standing orders invited.