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P. INODOROUS, also from North America , differs little in size and shape of flowers from P. grandiflorus, but the flowers are without scent. The leaves, too, are quite glabrous and obscurely toothed. P. LEMOINEI BOULE D'ARGENT is a cross, raised in 1888, from P. Lemoinei and the double-flowered form of P. coronarius.
Another half-hardy species, and only suited for planting against sunny walls. Leaves pinnate, finer than those of the Raspberry. R. r. coronarius, with semi-double white flowers, is better than the type. R. SPECTABILIS. The Salmon Berry. North America, 1827. Grows about 6 feet high, with ternate or tri-lobate leaves that are very thickly produced.
P. coronarius argenteo-variegatus has silvery-tinted leaves; P. coronarius flore-pleno, full double flowers; and P. coronarius Keteleeri flore-pleno is the best double-flowered form in cultivation.
PHILADELPHUS CORONARIUS. Mock Orange, or Syringa. South Europe, 1596. A well-known and valuable garden shrub, of from 6 feet to 10 feet high, with ovate and serrulated leaves, and pretty racemes of white or yellowish-white, fragrant flowers.
P. GORDONIANUS, an American species , is a well-known and beautiful shrub, in which the flowers are usually double the size of those of the common species, and which are not produced till July, while those of P. coronarius appear in early May. Southern United States, 1811. This has rotundate, irregularly-toothed leaves, and large white, sweetly-scented flowers produced in clusters.
P. coronarius aureo-variegatus is one of the numerous forms of this shrub, having brightly-tinted, golden foliage, but the flowers are in no way superior to those of the parent. It is, if only for the foliage, an extremely pretty and distinct variety.
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