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A species closely related to C. supinus, from which it differs in having the hairs of the stems, leaves and pods appressed; it is of more restricted range, occurring from Czechoslovakia and Hungary eastward to the Caucasus, while C. supinus extends westward as far as the Atlantic. It is usually represented in gardens by the following variety, which differs from the type in little but its more slender stems and narrower leaflets:
† C pygmaeus Willd. Chamaecytisus pygmaeus (Willd.) Rothm. – A low, spreading shrub, ultimately a yard or so wide, but no more than about 6 in. high. This is the main distinction between it and C. austriacus, which (like its var. heufellii) has erect branches. The leaflets are smaller, and the flowers up to five in a cluster. Perhaps only a variety of C. austriacus. It is a native of the eastern Balkans and Anatolia, in cultivation from seeds collected in the latter area by Cheese, Mitchell and Watson in 1967 (Bull. Alp. Gard. Soc., Vol. 42 (1974), p. 274, ill. p. 272).
C. heuffelii Griseb. & Schenk
Chamaecytisus heuffelii (Griseb. & Schenk) Rothm