variety. 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.

P. GORDONIANUS, an American species (1839), 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.

P. GRANDIFLORUS (_syns P. floribundus, P. latifolius_ and _P.
speciosus_).--Southern United States, 1811. This has rotundate,
irregularly-toothed leaves, and large white, sweetly-scented flowers
produced in clusters. This forms a stout bush 10 feet high, and as much
through. There are two varieties, P. grandiflorus laxus, and P.
grandiflorus speciosissimus, both distinct and pretty kinds.

P. HIRSUTUS.--North America, 1820. Another handsome, small-flowered
species, of dwarf growth, and having hairy leaves.

P. INODOROUS, also from North America (1738), 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. The flowers are double
white and with the pleasant, but not heavy, scent of P. microphyllus. P.
Lemoinei Gerbe de Neige bears pleasantly-scented flowers that are as
large as those of the well-known P. speciosissimus. There is an erect
form of P. Lemoinei named erectus that is also worthy of note.