Education
He then studied at the University of Vienna in the Department of Botany and Zoology.
He then studied at the University of Vienna in the Department of Botany and Zoology.
He specialized in bulbous plants, especially the Hyacinthaceae. The standard author transcript Speta is used to indicate this individual as the author when citing a botanical name. Speta worked as an apprentice for a clerk.
He wrote among professors such as Lothar Geitler and Tschermak Woess about the "evolution and karyology of elaiosomes to fruit and seeds." In 1972, he received a Doctor of Philosophy
From 1993 to 2003 he was head of the newly founded Biology Centre of the National Museum.
In 1982, he received the venia legendi of Systematic Botany at the University of Salzburg. In 1994, he became the Councilor appointed.
The research focus of Speta was the bulbous plants, here especially the Hyacinthaceae focusing Scilla and Ornithogalum. Other subjects are the tribes Antirrhineae the Scrophulariaceae, and Pinguicula (Lentibulariaceae).
He has published about 100 scientific papers.
He also has approximately 50 biographical works, primarily about botany.