var. tenuiloba Ser.
P. tenuifolia Schlecht.
P. fruticosa var. tenuifolia (Ser.) Lehm. (the last-named variety has the same circumscription as var. tenuiloba Ser., but Lehman reverted to the epithet tenuifolia originally used by Schlechtendal)
This name (or var. tenuifolia
) has been used for plants with narrower, more hairy leaflets than normal, some of them American, others probably belonging to the typical subspecies. According to Handel-Mazzetti, the type-sheet of P. tenuifolia
also includes a specimen of P. parvifolia
. Plants distributed commercially as P. fruticosa
are typical P. fruticosa
has been in cultivation since the latter part of the 17th century but is little seen at the present time, having been displaced in gardens by allied species from China and the Himalaya and by various hybrids, with neater foliage and more striking flowers borne over a longer period. But it still deserves to be grown, as one of the most interesting of European shrubs. The best collection of P. fruticosa
can be seen in the University Botanic Garden, Cambridge, where there are plants from North America (three localities), the British Isles (the Burren, the Pillar, Teesdale), and from Öland. The last is by far the most ornamental.