The typical variety is distinguished mainly in that the vegetative parts are completely glabrous, but there are a few differences of degree which as a rule cannot be regarded as specific. The stipules of var. denudata may reach a size of 17 x 6 mm although they are often smaller. The largest stipule seen on var. erecta was 9 x 3 mm, but the majority measured only 8 x 1.5 mm. The leaves on the typical variety are usually slightly longer in proportion to width, for example a leaf 40 mm long may be 8 to 10 mm broad in this variety while in var. erecta a leaf of 30 mm long is usually 9 or 10 mm broad. The flowers in var. denudata are recorded as yellow whereas in var. erecta they are often red or partly yellow and partly red.
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