CONTRIBUTIONS TO THE FLORA OF THE CITY OF ZURICH - VI - DICOTYLEDONES4 (UMBELLIFERAE BIS LABIATAE)

The sixth contribution to the flora of Zurich deals with 104 genera an d 17 families among others Umbelliferae, Boraginaceae and Labiatae. Of the 222 species studied, 155 are or were more or less established in the region. 26 (17 %) of these species disappeared, 49 (31 %) decrease d in frequency, 25 (16 %) colonized newly various areas of the region and 8 (5 %) are more frequent today. 43 (18 %) species show about the same distribution and frequency today as 160 years ago.The remaining 4 species were possibly overlooked by Kolliker(1839). The following cri tical groups were analyzed more closely: Aethusa cynapium s. l., Pasti naca sativa a. l., Monotropa hypopitys s. l., Primula vulgaris-elatior -veris, Myosotis palustris s. l., Ajuga reptans-genevensis, Galeopsis tetrahit s. l., Lamium galeobdolon s. l., Thymus serpyllum s. l., and Mentha.