SYSTEMATICS OF THE GENUS SIGMATOSTALIX (ORCHIDACEAE).

Résumé du livre

Most species have small flowers which are unusually complex, even for orchids. The genus is divisible into two groups based on lip morphology; those with a three-parted lip are very poorly known. The relatively massive callus, usually located at the base of the lip, is characteristic of the genus and supplies a great deal of taxonomically useful information. Within this callus is the elaiophore which secretes lipids as an attractant to pollinators. The details of elaiophore morphology match closely the