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Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Cytisus × kewensis' from the website Trees and Shrubs Online (treesandshrubsonline.
A low, deciduous, perfectly procumbent shrub less than 1 ft high, but sometimes 6 ft across. Leaves sometimes simple, but usually trifoliolate, downy. Flowers produced in May singly, or two or three together, at each joint of the previous year’s wood; they are each about 1⁄2 in. long, creamy white or pale sulphur-yellow, with a fine standard petal 1⁄2 in. across. Bot. Mag., n.s., t. 299.
A hybrid between C. ardoinii (seed-bearer) and C. multijlorus, raised at Kew in 1891. For growing on shelves of the rock garden few dwarf shrubs are more beautiful. The flowers are rather larger than those of C. × praecox, but otherwise very similar.