Appearance
Flowers are borne closely in the leaf-axils, either solitary, in pairs or in threes, bright yellow, 3⁄8 in. long, opening in May and June and forming handsome, cylindrical leafy racemes 3 to 6 in. long; calyx silky-hairy. Pod up to 1 in. long by 1⁄4 in. wide, shaggy with appressed hairs, carrying three or four seeds.Native of the mountains of S.E. Europe, quite hardy, very floriferous and handsome, forming low patches several feet across.
References:
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http://treesandshrubsonline.org/articles/cytisus/cytisus-procumbens/