Chapter 9

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.

P. LEWISI, from North America, is hardly sufficiently distinct from some of the others to warrant special notice.

P. MICROPHYLLUS, from New Mexico (1883), is of low growth, and remarkable for its slender branches, small, Myrtle-like leaves, and abundance of small, white flowers. It is a decidedly pretty shrub, but is not so hardy as the others.

P. SATZUMI (_syn P. chinensis_).--Japan, 1851. A slender-growing species, with long and narrow leaves, and large, white flowers.

P. TRIFLORUS and P. MEXICANUS are other species that might be worthy of including in a representative collection of these plants.

This is a valuable genus of shrubs, all being remarkable for the abundance of white, and usually sweet-scented, flowers which they produce. They require no special treatment, few soils, if at all free and rich, coming amiss to them; while even as shrubs for shady situations they are not to be despised. Propagation is effected by means of cuttings, which root freely if placed in sandy soil.

PHILLYREA.

P. ANGUSTIFOLIA (narrow-leaved Phillyrea), P. ilicifolia (Holly-leaved Phillyrea), P. salicifolia (Willow-leaved Phillyrea), P. buxifolia (Box-leaved Phillyrea), and P. ligustrifolia (Privet-leaved Phillyrea), are all more or less valuable species, and their names indicate their peculiarities of leafage. P. angustifolia rosmarinifolia (_syn P. neapolitana_) is a somewhat rare shrub, but one that is well worthy of culture, if only for its neat habit and tiny little Rosemary-like leaves. It is from Italy, and known under the synonym of _P. rosmarinifolia_.

P. LATIFOLIA (_syn P. obliqua_).--Broad-leaved Phillyrea. South Europe, 1597. This is a compact-growing and exceedingly ornamental shrub, with bright and shining, ovate-serrulated leaves. For its handsome, evergreen foliage and compact habit of growth it is, perhaps, most to be valued, for the small flowers are at their best both dull and inconspicuous. Not very hardy unless in the sea-coast garden.

P. MEDIA (_syns P. ligustrifolia_ and _P. oleaefolia_).--South Europe, 1597. This is another interesting species, but not at all common in cultivation.

P. VILMORINIANA (_syns P. laurifolia_ and _P. decora_).--Asia Minor, 1885, This is a grand addition to these valuable shrubs, of which it is decidedly the best from an ornamental point of view. It is of compact growth, with large, Laurel-like leaves, which are of a pleasing shade of green, and fully 4 inches long. They are of stout, leathery texture, and plentifully produced. That this shrub is perfectly hardy is now a well-established fact.

The Phillyreas succeed well in light, warm, but not too dry soil, and they do all the better if a warm and sheltered position is assigned to them. Being unusually bright of foliage, they are of great service in planting for shrubbery embellishment, and which they light up in a very conspicuous manner during the dull winter months. They get shabby and meagre foliaged if exposed to cold winds.

PHLOMIS.

PHLOMIS FRUTICOSA.--Jerusalem Sage. Mediterranean region, 1596. This is a neat-growing shrubby plant, with ovate acute leaves, that are covered with a yellowish down. From the axils of the upper leaves the whorls of yellow flowers are freely produced during the summer months. It is valued for its neat growth, and as growing on dry soils where few other plants could eke out an existence.

PHOTINIA.

PHOTINIA JAPONICA (_syn Eriobotrya japonica_).--Loquat, Japan Medlar, or Japan Quince. Japan, 1787. This is chiefly remarkable for its handsome foliage, the leaves being oblong of shape and downy on the under sides. The white flowers are of no great beauty, but being produced at the beginning of winter, and when flowers are scarce, are all the more welcome. It requires protection in all but the warmer parts of these islands.

P. ARBUTIFOLIA (_syns Crataegus arbutifolia_ and _Mespilus arbutifolia_).--Arbutus-leaved Photinia, or Californian May-bush. California, 1796. This is a very distinct shrub, with leaves resembling those of the Strawberry Tree (Arbutus), the flowers in an elongated panicle, and bright red bark on the young wood.

P. BENTHAMIANA is only worthy of culture for its neat habit and freedom of growth when suitably placed.

P. SERRULATA (_syn Crataegus glabra_).--Chinese Hawthorn. Japan and China, 1804. This has Laurel-like leaves, 4 inches or 5 inches long, and, especially when young, of a beautiful rosy-chocolate colour, and clustered at the branch-tips. Flowers small, white, and produced in flat corymbs. An invaluable seaside shrub.

They all grow well either in light, rich loam, or in sandy, peaty earth, and are usually propagated by grafting.

PHYLODOCE.

PHYLODOCE TAXIFOLIA (_syns P. caerulea_ and _Menziesia caerulea_).--An almost extinct native species, having crowded linear leaves, and lilac-blue flowers. It is only of value for rock gardening.

PIERIS.

PIERIS FLORIBUNDA (_syns Andromeda floribunda_ and _Leucothoe floribunda_).--United States, 1812. Few perfectly hardy shrubs are more beautiful than this, with its pure white Lily-of-the-Valley like flowers, borne in dense racemes and small, neat, dark green leaves. To cultivate this handsome shrub in a satisfactory way, fairly rich loam or peat, and a situation sheltered from cold and cutting winds, are necessities.

P. JAPONICA (_syn Andromeda japonica_).--Japan, 1882. A hardy, well-known shrub, that was first brought specially under notice in "The Garden," and of which a coloured plate and description were given. It is thickly furnished with neat and small deep-green, leathery leaves, and pretty, waxy white flowers, pendulous at the branch tips. Planted in free, sandy peat, it thrives vigorously, and soon forms a neat specimen of nearly a yard in height. It is a very desirable hardy species, and one that can be confidently recommended for ornamental planting. There is a variegated variety, P. japonica elegantissima, with leaves clearly edged with creamy-white, and flushed with pink. Amongst variegated, small-growing shrubs it is a gem.

P. MARIANA (_syn Andromeda Mariana ovalis_).--North America, 1736. A neat shrub of about 3 feet in height, with oval leaves, and pretty white flowers in pendent clusters.

P. OVALIFOLIA (_syn Andromeda ovalifolia_).--Nepaul, 1825. A fine, tall-growing species, with oval-pointed, leathery leaves placed on long footstalks. Flowers in lengthened, drooping, one-sided racemes, and white or pale flesh-coloured. Being perfectly hardy, and attaining to as much as 20 feet in height, it is a desirable species for the lawn or shrubbery.

PIPTANTHUS.

PIPTANTHUS NEPALENSIS (_syn Baptisia nepalensis_).--Evergreen Laburnum. Temperate Himalaya, 1821. A handsome, half-hardy shrub, of often fully 10 feet high, with trifoliolate, evergreen leaves, and terminal racemes of large yellow flowers. In the south and west of England and Ireland it does well, and only receives injury during very severe winters. Planted either as a single specimen, or in clumps of three or five, the evergreen Laburnum has a pleasing effect, whether with its bright, glossy-green leaves, or abundance of showy flowers. It is of somewhat erect growth, with stout branches and plenty of shoots. Propagated from seed, which it ripens abundantly in this country.

PITTOSPORUM.

PITTOSPORUM TOBIRA.--Japan, 1804. This forms a neat, evergreen shrub, with deep green, leathery leaves, and clusters of white, fragrant flowers, each about an inch in diameter. It is hardy in the more favoured parts of the south and west of England, where it makes a reliable seaside shrub.

P. UNDULATUM, from Australia (1789), is also hardy against a wall, but cannot be depended upon generally. It is a neat shrub, with wavy leaves, that are rendered conspicuous by the dark midribs. They grow well in any good garden soil.

PLAGIANTHUS.

PLAGIANTHUS LYALLI, a native of New Zealand (1871), and a member of the Mallow family, is a free-flowering and beautiful shrub, but one that cannot be recommended for general planting in this country. At Kew it does well and flowers freely on an east wall. The flowers are snow-white, with golden-yellow anthers, and produced on the ends of the last season's branchlets during June and July. The flower-stalks, being fully 2 inches long, give to the flowers a very graceful appearance. In this country the leaves are frequently retained till spring.

P. LAMPENI.--Van Dieman's Land, 1833. This is about equally hardy with the former, and produces a great abundance of sweetly-scented flowers.

P. PULCHELLUS (_syn Sida pulchella_).--Australia and Tasmania. Another half-hardy species, which bears, even in a young state, an abundance of rather small, whitish flowers.

POLYGALA.

POLYGALA CHAMAEBUXUS.--Bastard Box. A neat little shrubby plant, with small ovate, coriaceous leaves, and fragrant yellow and cream flowers. P. chamaebuxus purpureus differs in bearing rich reddish-purple flowers, and is one of the most showy and beautiful of rock plants. They are natives of Europe (1658), and grow best in vegetable mould.

POTENTILLA.

POTENTILLA FRUTICOSA.--Northern Hemisphere (Britain). An indigenous shrub that grows about a yard high, with pinnate leaves and golden flowers. It is a most persistent blooming plant, as often for four months, beginning in June, the flowers are produced freely in succession. It delights to grow in a strong soil, and, being of low, sturdy growth, does well for the outer line of the shrubbery.

PRUNUS.

PRUNUS AMYGDALUS (_syn Amygdalus communis_).--Common Almond. Barbary, 1548. Whether by a suburban roadside, or even in the heart of the crowded city, the Almond seems quite at home, and is at once one of the loveliest and most welcome of early spring-flowering trees. The flowers are rather small for the family, pale pink, and produced in great quantity before the leaves. There are several distinct forms of the Almond, differing mainly in the colour of the flowers, one being pink, another red, while a third has double flowers. P. Amygdalus macrocarpa (Large-fruited Almond) is by far the handsomest variety in cultivation, the flowers being large, often 3 inches in diameter, and white tinged with pink, particularly at the base of the petals. The flowers, too, are produced earlier than those of any other Almond, while the tree is of stout growth and readily suited with both soil and site.

P. AMYGDALUS DULCIS (_syn A. dulcis_), Sweet Almond, of which there are three distinct varieties, P.A. dulcis purpurea, P.A. dulcis macrocarpa, and P.A. dulcis pendula, should be included in every collection of these handsome flowering plants.

P. AVIUM JULIANA (_syn Cerasus Juliana_).--St. Julian's Cherry. South Europe. This bears large flowers of a most beautiful and delicate blush tint. P. Avium multiplex is a double form of the Wild Cherry, or Gean, with smaller leaves than the type.

P. BOISSIERII (_syn Amygdalus Boissierii_).--Asia Minor, 1879. This is a bushy shrub, with almost erect, long, and slender branches, and furnished with leaves an inch long, elliptic, and thick of texture. Flowers pale flesh-coloured, and produced abundantly. It is a very ornamental and distinct plant, and is sure, when better known, to attract a considerable amount of attention.

P. CERASIFERA (_syn P. Myrobalana_).--Cherry, or Myrobalan Plum. Native Country unknown. A medium-sized tree, with an abundance of small white flowers, which are particularly attractive if they escape the early spring frosts. It is of stout, branching habit, with a well-rounded head, and has of late years attracted a good deal of notice as a hedge plant. P. cerasifera Pissardii, the purple-leaved Cherry plum, is a remarkable and handsome variety, in which the leaves are deep purple, thus rendering the plant one of the most distinct and ornamental-foliaged of the family. It produces its white, blush-tinted flowers in May. It was received by M.A. Chatenay, of Sceau, from M. Pissard, director of the garden of His Majesty the Shah of Persia. When it flowered it was figured in the _Revue Horticole_, 1881, p. 190.

P. CERASUS (_syn Cerasus vulgaris_).--Common Cherry. A favourite medium-sized tree, and one that lends itself readily to cultivation. As an ornamental park tree this Cherry, though common, must not be despised, for during summer, when laden with its pure white flowers, or again in autumn when myriads of the black, shining fruits hang in clusters from its branches, it will be readily admitted that few trees have a more beautiful or conspicuous appearance, P. Cerasus flore-pleno (double-flowered Cherry) is a distinct and desirable variety. P. Cerasus multiplex is a very showy double form, more ornamental than P. Avium muliplex, and also known under the names of _Cerasus ranunculiflora_ and _C. Caproniana multiplex_. P. Cerasus semperflorens (_syn Cerasus semperflorens_), the All Saints, Ever Flowering, or Weeping, Cherry, is another valuable variety, of low growth, and with gracefully drooping branches, particularly when the tree is old. It is a very desirable lawn tree, and flowers at intervals during the summer.

P. CHAMAECERASUS (_syn Cerasus Chamaecerasus_).--Ground Cherry. Europe, 1597. This is a dwarf, slender-branched, and gracefully pendent shrub, of free growth, undoubted hardihood, and well worthy of extended cultivation. The variety C. Chamaecerasus variegata has the leaves suffused with greenish lemon. There is also a creeping form named P. Chamaecerasus pendula.

P. DAVIDIANA.--Abbé David's Almond. China. This is the tree to which, under the name of Amygdalus Davidiana alba, a First-class Certificate was awarded in 1892 by the Royal Horticultural Society. The typical species is a native of China, from whence it was introduced several years ago, but it is still far from common. It is the earliest of the Almonds to unfold its white flowers, for in mild winters some of them expand before the end of January; but March, about the first week, it is at its best. It is of more slender growth than the common Almond, and the flowers, which are individually smaller, are borne in great profusion along the shoots of the preceding year, so that a specimen, when in full flower, is quite one mass of bloom. There is a rosy-tinted form known as Amygdalus Davidiana rubra.

P. DIVARICATA, from the Caucasus (1822), is useful on account of the pure white flowers being produced early in the year, and before the leaves. It has a graceful, easy habit of growth, and inclined to spread, and makes a neat lawn or park specimen.

P. DOMESTICA, Common Garden Plum, and P. domestica insititia, Bullace Plum, are both very ornamental-flowering species, and some of the varieties are even more desirable than the parent plants.

P. ILLICIFOLIA (_syn Cerasus ilicifolius_).--Holly-leaved Cherry. California. A distinct evergreen species, with thick leathery leaves, and erect racemes of small white flowers. A native of dry hilly ground along the coast from San Francisco to San Diego. Hardy in most situations, but requiring light warm soil and a dry situation.

P. LAUNESIANA (_syn Cerasus Launesiana_).--Japan, 1870. This is a valuable addition to the already long list of ornamental-flowering Cherries. It flowers in the early spring, when the tree is literally enshrouded in rose-coloured flowers, and which produce a very striking effect. The tree is quite hardy, flowers well even in a young state, and will grow in any soil that suits our common wild species.

P. LAUROCERASUS (_syn Cerasus Laurocerasus_).--Common, or Cherry Laurel. Levant, 1629. Although a well-known garden and park shrub, of which a description is unnecessary, the common or Cherry Laurel, when in full flower, must be ranked amongst our more ornamental shrubs. There are several varieties all worthy of culture for the sake of their evergreen leaves and showy flower spikes. P. Laurocerasus rotundifolia has leaves that are broader in proportion to their length than those of the common species; P. Laurocerasus caucasica is of sturdy growth, with deep green leaves, and a compact habit of growth; P. Laurocerasus colchica is the freest-flowering Laurel in cultivation, with horizontally arranged branches and pale green leaves; P. Laurocerasus latifolia, a rather tender shrub, with bold handsome foliage; and P. Laurocerasus parvifolia, of low growth, but never very satisfactory in appearance. Three other less common forms might also be mentioned. P. Laurocerasus angustifolia, with narrow leaves; P. Laurocerasus camelliaefolia, with thick leathery foliage; and P. Laurocerasus intermedia, halfway between P. Laurocerasus angustifolia and the common Laurel.

P. LUSITANICA (_syn Cerasus lusitanica_).--Portugal Laurel. Portugal, 1648. A well-known shrub or small growing tree, and one of the most valuable of all our hardy evergreens. It is of neat and compact growth, with a good supply of bright green shining foliage, and bears long spikes of pleasing creamy white perfumed flowers. P. lusitanica myrtifolia (Myrtle-leaved Portugal Laurel) differs from the species in the smaller, longer, and narrower leaves, which are more thickly arranged, and in its more decided upright habit. P. lusitanica variegata is hardly sufficiently constant or distinct to warrant recommendation. P. lusitanica azorica, from the Azores, is of more robust growth than the common plant, with larger and richer green leaves, and the bark of the younger branches is of a very decided reddish tinge.

P. MAHALEB (_syn Cerasus Mahaleb_).--The Mahaleb, or Perfumed Cherry. South Europe, 1714. This and its variegated variety P. Mahaleb variegata are very free-flowering shrubs, and of neat growth. The variegated variety is well worthy of attention, having a clear silvery variegation, chiefly confined to the leaf margin, but in a less degree to the whole of the foliage, and imparting to it a bright, glaucous tint that is highly ornamental. There is a partially weeping form named P. Mahaleb pendula.

P. MARITIMA.--Beach or Sand Plum. North America, 1800. A prostrate, spreading shrub, that is of value for planting in poor sandy soil, and along the sea coast. The flowers are small, but plentifully produced.

P. NANA (_syns Amygdalus nana_ and _A. Besseriana_).--Dwarf Almond. From Tartary, 1683. This is of dwarf, twiggy growth, rarely more than 3 feet high, and bearing an abundance of rose-coloured flowers in early February. From its neat, small growth, and rich profusion of flowers, this dwarf Almond may be reckoned as a most useful and desirable shrub. Suckers are freely produced in any light free soil.

P. PADUS (_syn Cerasus Padus_).--Bird Cherry or Hagberry. An indigenous species, with oblong, doubly-serrated leaves, and terminal or axillary racemes of pure-white flowers. It is a handsome and distinct small-growing tree, and bears exposure at high altitudes in a commendable manner.

P. PANICULATA FLORE-PLENO (_syns Cerasus serrulata flore-pleno_ and _C. Sieboldii_).--China, 1822. This is one of the most desirable of the small-growing and double-flowered Cherries. It is of neat growth, with short, stout branches that are sparsely furnished with twigs, and smooth, obovate, pointed leaves, bristly serrated on the margins. Flowers double and white at first, but afterwards tinged with pink, freely produced and of good, lasting substance. P. paniculata Watereri is a handsome variety that most probably may be linked to the species.

P. PENNSYLVANIA.--American Wild Red Cherry. North America, 1773. This is an old-fashioned garden tree, and one of the choicest, producing in May a great abundance of its tiny white flowers.

P. PERSICA FLORE-PLENO (_syns Amygdalus Persica flore-pleno_ and _Persica vulgaris_), double-flowering Peach, is likewise well worthy of culture, there being white, rose, and crimson-flowering forms.

P. PUDDUM (_syns P. Pseudo-cerasus_ and _Cerasus Pseudo-cerasus_).--Bastard Cherry. China, 1891. There are very few more ornamental trees in cultivation in this country than the double-flowering Cherry. It makes a charming small-growing tree, is of free growth and perfectly hardy, and one of, if not the most, floriferous of the tribe. The flowers are individually large, pinky or purplish-white, and produced with the leaves in April.

P. SINENSIS.--China, 1869. A Chinese Plum of somewhat slender growth, and with the branches wreathed in small, white flowers. It is often seen as a pot plant, but it is one of the hardiest of its family. P. sinensis flore-pleno is a double white form, and the most ornamental for pot work. There is also a variety with rose-coloured flowers.

P. SPINOSA.--Sloe, or Blackthorn. An indigenous, spiny shrub, with tiny white flowers; and P. spinosa flore-pleno has small, rosette-like flowers that are both showy and effective.

P. TOMENTOSA.--Japan, 1872. This is one of the most desirable of hardy shrubs, with large, white, flesh-tinted flowers produced in the first weeks of March, and in such quantities as almost to hide the branches from view. It forms a well-rounded, dense bush of 5 feet or 6 feet high.

P. TRILOBA (_syns P. virgata, Amygdalopsis Lindleyi_ and _Prunopsis Lindleyi_).--China, 1857. This is a very handsome early-flowering shrub, that is at once recognised by the generally three-lobed leaves. It is one of the first to flower, the blossoms being produced in March and April, and sometimes even earlier when the plant is grown against a sunny, sheltered wall. The semi-double flowers are large and of good substance, and of a rosy-white tint, but deep rose in the bud state. There is a nursery form of this plant with white flowers, named P. triloba alba. It is quite hardy, bears pruning well, and grows quickly, soon covering a large space of a wall or warm, sunny bank. As an ornamental flowering lawn shrub it has few equals, the blossoms remaining good for fully a fortnight.

P. VIRGINIANA (_syn Cerasus virginiana_) and P. SEROTINA (North American Bird Cherries) are worthy species, with long clusters of flowers resembling those of our native Bird Cherry. They are large-growing species, and, particularly the latter, are finding favour with cultivators in this country on account of their bold and ornamental appearance.

PTELEA.

PTELEA TRIFOLIATA.--Hop Tree, or Swamp Dogwood. North America, 1704. A small-growing tree, with trifoliolate, yellowish-green leaves placed on long footstalks, and inconspicuous greenish flowers. The leaves, when bruised, emit an odour resembling Hops. P. trifoliata variegata is one of the handsomest of golden-leaved trees, and is well worthy of extensive planting. It is preferable in leaf colouring to the golden Elder. Perfectly hardy.

PUNICA.