The Chiltern Gentian Gentianella germanica differs from similar species
as e.g. Gentianella anisodonta,
Gentianella austriaca,
Gentianella lutescens,
Gentianella ramosa, and some more,
in that the calyx teeth are approximately the same size, smooth and hairless.
There are plants that look like the Chiltern Gentian in the central and eastern Alps,
but also in various calcareous lower mountain ranges outside the Alps,
e.g. in the Swiss Jura, in Germany (e.g. Swabian Alb, Franconian Alb), in the Czech Republic, in Belgium, and even in Great Britain.
The populations inside and outside the Alps differ significantly genetically, therefore the Alpine populations were separated
as Rhaetian Gentian Gentianella rhaetica.
The morphological differences between the two species are rather small:
At Gentianella rhaetica the corolla is 1.5 to maximum twice as long as the calyx,
while at G. germanica it is usually more than twice as long.
At G. rhaetica the peduncle of the ovary is about as long as the calyx,
while at G. germanica it is only about a tenth to maximum half as long.
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