Range of distribution of Lesser Trefoil, Lesser Hop Trefoil (Trifolium dubium Sibth.).

Object description Download GIS-layers


The expert-botanists - N.I.Dzyubenko, E.A.Dzyubenko.
The GIS expert - A.N.Dzyubenko.

Date of creation:



1:20 000 000.

Accuracy of the map:

The map is based on data of a 1:80 000 000 scale map, specified according to herbarium materials.


"Albers Equal-Area Conic Projection for USSR", 9, 1001, 7, 100, 0, 44, 68, 0, 0

Basic contents:

The map is a vector file consisting of 1 basic and 2 subject layers. The species range is represented by polygons and dots.

Accuracy of the qualifier:

The dots represent information on the species localities: 1 - reliable data from herbarium and published sources; polygons (1) - generalized information on the species distribution from published sources and herbarium specimens.

Method of the map construction:

The data from the herbarium materials of LE and published data were used for constructing the range of Trifolium dubium. Our view of the species distribution in Russia and adjacent states mainly agrees with the treatment of the species distribution by Hulten, Fries (1986). We somewhat extended the polygon borders eastward and southwestward, based on both herbarium material and published data (Bobrov, 1945, 1987). The range consists of two polygons and dots. The main polygon covers an extensive area in the European part of the former USSR. A separate polygon is situated in Crimea. Two small polygons cited by Hulten, Fries (1986), are confirmed neither by LE herbarium data, nor by published data of domestic "Floras".


Bobrov EG. 1987. Hop Clover - Chrysaspis Desv. In: Fedorov AA., Tzvelev NN., eds. Flora of the European part of the USSR. V.6. P.209-212. (In Russian).
Bobrov EG. 1945. Clover - Trifolium L. In: Shishkin BK., ed. Flora URSS. V.11. P.189-261. (In Russian).
Hulten E., Fries M. 1986. Atlas of North European vascular plants north of the Tropic of Cancer. V.1-3. Konigstein: Koeltz Scientific Books.
Herbarium specimens of V.L.Komarov Botanical Institute [LE] (St.Petersburg, Russia).

Rights and copyrights:

The copyrights of the map and descriptions are held by their authors.
The copyright of the photo is held by E.A.Dzyubenko.

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