The distribution area of Asclepias syriaca L. (Milkweed)

Object description Download GIS-layers


The expert-botanist - T.N. Smekalova
The GIS-expert - G.V. Talovina

Date of creation:




Accuracy of map:

Map was created using data from herbarium specimens and published literature.

The projection:

"Alber's Equal Area Conic for Russia", 9, 1001, 7, 100, 0, 44, 68, 0, 0.

Basic contents:

Vector map. Area of species distribution is shown by polygons; actual location occurrence is shown by points.

Accuracy of classifier:

Point data were obtained from published sources and herbarium specimens. Dark-colored points represent the locations from which herbarium samples of the species were taken. Polygons were created using published sources, herbarium samples, and field surveys by the authors.

Method of map production:

Published literature was reviewed, including atlases, monographs and papers. Occurrence data were obtained from herbarium specimens, floras, monographs and papers. The distribution area of this species was determined using materials from the following herbaria: V.L. Komarov Botanical Institute, N.I. Vavilov Institute, and Moscow State University. According to Tcherepanov (1995), Shishkin & Bobrov (1952), and Grossgheim (1967), it was determined that this species is invasive within the former USSR and can be found in the central and southern parts of the former USSR and the Caucasus. Data were then compiled through scanning and geo-referencing to develop a composite vector map. The biologist, together with the GIS specialist, drew a new plant distribution area based on compiled data. For the researched territory, there are neither current maps of the species distribution area nor detailed information on the distribution of the species. Because of this, it was decided to present the final distribution area of the species as separate points. All available points are located within the European region of former USSR and in the Caucasus, which corresponds to the available published data. The overwhelming majority of points are located in river basins, which is usually typical of invasive species.

Reference citations:

Shishkin, B.K. & E.G. Bobrov, eds. 1952. Flora USSR. V. XVIII. Moscow-Leningrad: Publishing House of Acad. Science. 802 p. (In Russian)
Cherepanov S.K. 1995. Plantae Vasculares Rossicae et Civitatum Collimitanearum (in limics USSR olim)[List of Vascular Plants of Russia]. St. Petersburg: Mir I Semia. 990 pp. (In Russian)
Grossheim, A.A. 1967. Flora of Caucasia. V. 7. Leningrad: Nauka. 220 p. (In Russian)
Moscow State University [MWG], St. Petersburg, Russia.
N.I. Vavilov All-Russian Institute of Plant Industry [WIR], St. Petersburg, Russia.
V.L. Komarov Botanical Institute [LE], St. Petersburg, Russia.

Right and copyright:

Copyright on this map and its description belongs to its authors.
Copyright on this picture belongs to Robert Flogaus-Faust: Bild (c) Robert Flogaus-Faust ( ).

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