Johannes Walter

University of Vienna | UniWien

The formal proposal to conserve the name Chenopodium quinoa (Chenopodiaceae / Amaranthaceae sensu APG) against C. purpurascens and C. punctulatum

Der in Österreich sehr seltene Rostpilz Puccinia poae-aposeridis (Pucciniaceae) wurde im Zuge von Feldarbeiten in Hallstatt gefunden und wird hiermit erstmals für Oberösterreich nachgewiesen. Die Untersuchung von Herbarbelegen des Hauptwirtes Aposeris foetida (Asteraceae) in den Herbarien LI, W und WU erbrachte zwei weitere bisher unbekannte österr...

Portulaca oleracea is a noxious annual weed of worldwide distribution in temperate to tropical climates. Its taxonomy has been treated in contradictory ways in the past. Various microspecies have been described, lumped into a single species by other authors. We re-examined the importance of seed size and ploidy variation, previously applied as the...

Nomenclatural types for 30 names of the genus Thymus are designated here. The following names are lectotypified: Th. adriaticus, Th. albanus subsp. magellensis, Th. alsarensis, Th. alsarensis var. paucisetus, Th. belgradiensis, Th. benacensis, Th. boissieri var. ciliatopubescens, Th. brevicalyx, Th. britannicus, Th. chaubardii subsp. subisophyllus,...

Amaranthus blitum L. subsp. emarginatus (MOQ. ex ULINE & BRAY) CARRETERO, MUNOZ GARMENDIA & PEDROL. has been recently introduced to Austria. This neophyte occurs on banks of the rivers Thaya and March along the northeastern border of Austria where it has been established. All further locations encountered were restricted to ruderal habitats. A revi...

The headspace of Chenopodiumbotrys L. (Chenopodiaceae) was analyzed by GC, GC/FTIR/MS and GC-sniffing technique to determine the volatile constituents of this interesting plant. Monoterpenes (camphor, δ-3-carene, fenchone, linalool, menthone, nerol, β-pinene, pulegone, terpineol-4 and thujone) and sesquiterpenes (β-elemene, elemol and β-eudesmol) w...

Die Ergebnisse von 59 Chromosomenzählungen an 55 Taxa aus der Flora von Österreich werden präsentiert. In Fällen von differierenden Literarurangaben oder bei komplexen Verwandtschaftsgruppen erfolgt ein kritischer Vergleich mit vorliegenden Literaturdaten. KlEHN M. et al., 1991: Contributions to the Flora of Austria: chromosome counts. The results...