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Fig. 3. Red clover collection sites plotted on a map illustrating elevation and watersheds: (a) group 1 sites were 7 km apart connected by valleys and with no obvious geographical barriers, (b) group 2 sites were only 1 km apart with no intervening land forms, (c) group 3 collection sites were isolated by two ridges separated by an intervening valley with steep changes in elevation, (d) sites for group 4 had no intervening barriers, had similar elevation and the sites were 24 km apart, (e) sites for group 5 were separated by intervening mountains and hills, furthermore, the sites were separated by distances that ranged between 23 and 52 km, (f) in group 6, some of the collection sites were isolated by distance and intervening hills whereas others were only separated by distance.
