Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Philadelphus tomentosus' from the website Trees and Shrubs Online (treesandshrubsonline.
A shrub 6 or 8 ft high; young shoots glabrous, or slightly hairy when quite young only. Leaves 11⁄2 to 4 in. long, 3⁄4 to 2 in. wide; oval or ovate, with long slender points and a rounded or tapered base, unevenly toothed; dark green and hairy above, especially when young, grey and felted beneath; stalk 1⁄5 to 2⁄5 in. long. Petals oval, rounded at the end; calyx glabrous outside, downy inside; style about as long as the stamens; stigmas separate at the top.
Native of the Himalaya; introduced, according to Loudon, in 1822. It is often regarded as a variety of P. coronarius, but is amply distinguished from it by the grey-felted undersurface of the leaves. It is more nearly related to P. delavayi (q.v.).
Synonyms
P. lancifolius Koehne
Synonyms
P. nepalensis Koehne
P. triflorus Wall. ex Hu