Prunus subhirtella Miq.
A small deciduous tree, with twiggy, erect branches, 20 to 30 ft high; branchlets hairy, especially when young. Leaves 11⁄2 to 3 in. long, scarcely half as wide; ovate, taper-pointed, sharply, unequally, often doubly toothed; downy on the midrib and veins beneath; leaf-stalk 1⁄4 in. long, hairy. Flowers in short-stalked clusters of two to five, each flower 3⁄4 in. across, soft rose-coloured, becoming paler with age, and borne on a sparsely hairy stalk 1⁄3 in. long; calyx cylindrical, with short lobes; petals notched at the end. Fruits not seen by me, but described as round, shining black when ripe, 1⁄3 in. across.
Native of Japan; introduced to Kew in 1895, and since proved to be one of the most beautiful of the cherries. It flowers from the end of March until mid-April, before the leaves appear. It is easily propagated by cuttings put in about the middle of June, when the shoots are half woody.
var. ascendens (Mak.) Wils. P. pendula var. ascendens Mak.; P. aequinoctialis Miyoshi – This is the normal state of the species as it occurs wild in the mountains of Japan, Korea, and W. China. The leaves are larger than in typical P. subbirtella, with ten to fourteen pairs of veins and up to 5 in. long; they are also relatively narrower, and the margins are less markedly double-toothed. The epithet ascendens is misleading, implying as it does that P. subhirtella is typically pendulous, which is not the case. It was originally used by Makino to distinguish the normal erect-branched form of the wild species from the pendulous form, which Maximowicz took as the type of the species and named P. pendula (see further under var. pendula).
The var. ascendens is little cultivated and really only of interest as the progenitor of the cultivated varieties.
cv. ‘Autumnalis’. – A small, spreading tree up to about 25 ft high and as much or more in width. Flowers semi-double, pink in the bud, opening almost white, about 3⁄4 in. wide, the stamens pinkish darkening to crimson as the flowers fade, giving a bicolour effect. They usually start to appear in November, and the main display is usually before the hard weather sets in, and sometimes again in the early spring.
‘Autumnalis’ was apparently first distributed commercially in this country by the Daisy Hill Nursery around 1910, but a tree imported direct from Japan was planted at Borde Hill in Sussex some ten years earlier and must have been the largest in the country until it was smashed by a falling tree in the early 1960s; in 1933 it was 25 ft high and 42 ft in spread. It was at first grown under the name P. miqueliana.
‘Autumnalis’ received an Award of Merit when shown from Borde Hill in 1912 as “P. miqueliana”, and an Award of Garden Merit in 1924.
cv. ‘Autumnalis Rosea’. – Resembling the preceding, but with pale pink flowers. A.M. 1960.
cv. ‘Fukubana’. – Flowers with twelve to fourteen notched petals, crimson in bud, opening deep pink. Introduced from California by Collingwood Ingram in 1927. It flowers over a period of some weeks from early April. It is perhaps not the same as P. subhirtella var. fukubana, shortly described by the Japanese botanist Makino in 1908; Wilson gives Makino’s name as a synonym of P. subhirtella var. autumnalis. A.M. 1938.
var. pendula (Maxim.) Tanaka P. pendula Maxim. Shidare-Zakura. – A cultivated race of Japan, differing from the wild prototype (var. ascendens) only in its habit; the main branches are arching and spreading, the branchlets pendulous. In its homeland, where it is planted in gardens and temple-grounds, it builds up into a tall, rather tortuously branched tree. But in Britain, it makes a weeping tree of umbrella-like form and does not rise much above the point of grafting. The usual form – ‘Pendula Rosea’, often called ‘Pendula’ simply, the flowers are flesh-pink (indeed the epithet carnea would be more appropriate and was once in use at Kew). It was introduced to Britain around 1870 and originally known as Cerasus japonica pendula or Cerasus pendula rosea. A.M. 1930. In ‘Pendula Rubra’ the flowers are a deeper pink and the leaves lanceolate; there is a double row of this variety at Kew leading up to the door of the Temperate House.
Another weeping variety is ‘Pendula Plena Rosea’, introduced by Collingwood Ingram in 1928 from the Heian-Jingu temple, Kyoto. It resembles ‘Pendula Rubra’, but the flowers are double.
cv. ‘Rosea’. – A selection of P. subhirtella with rose-pink flowers.
cv. ‘Stellata’ (‘Pink Star’). – Flowers single, larger than in the type, with narrow-oblong petals. The flower clusters are set so close together at the ends of the branchlets that they seem to form a single panicle. This variety was raised by the American nurseryman W. B. Clarke and originally named ‘Pink Star’, but Collingwood Ingram gave it botanical status in Ornamental Cherries as var. stellata. It is depicted in that work in Fig. 26.
The following hybrids have P. subhirtella as one parent:
P. ‘Accolade’. – See under P. sargentii.
P. ‘Hally Jolivette’. – A small tree of dense, rounded habit with narrow-ovate, tapered, sharply toothed leaves, hairy above and more densely so beneath; leaf-stalk reddish. Flowers double, pink in the bud, opening white, about 11⁄4 in. wide, borne over a period of two weeks or more in late April or early May. It is unlikely to exceed 15 ft in height. It was raised at the Arnold Arboretum, USA, by Prof. Sax, the parentage being P. subhirtella back-crossed onto a hybrid between P. subhirtella and P. × yedoensis.
P. ‘Pandora’. – Flowers single, about 11⁄4 in. wide, petals pale pink with a deeper edge. Flowering-time early April. A beautiful, very floriferous cherry with ascending branches, making a narrowly vase-shaped crown. It was raised by Messrs Waterer of Bagshot and received an Award of Merit in 1939, and the Award of Garden Merit in 1959. The parentage is P. subhirtella crossed with P. × yedoensis, and the second parent seems to predominate.
From the Supplement (Vol. V)
Wilson considered that P. subhirtella in the narrow sense was simply a cultivated phase of the wild P. subhirtella (Makino) Wils. (P. pendula var. ascendens Makino). However, it is very probable that typical P. subhirtella was the result of hybridisation between the wild var. ascendens and P. incisa, the latter being responsible for its smaller size, doubly serrate leaves and some other characters (also for the precocious flowering of ‘Autumnalis’). If this view were adopted, the wild P. subhirtella var. ascendens of Wilson would take the name P. pendula var. ascendens Makino (or f. ascendens (Makino) Ohwi). The amount of disruption to horticultural nomenclature that this would involve is really very slight. All the cultivars mentioned on pages 412-13 would remain under P. × subhirtella, with the exception of those referred to under var. pendula, which would have to be transferred to P. pendula Maxim. It should, however, be noted that the very pendulous clone often called P. subhirtella ‘Pendula’ should be called ‘Pendula Rosea’, since the cultivar name P. pendula ‘Pendula’ would belong to the tall-growing tree with cascading branches on which Maximowicz was unwise enough to base the name P. pendula Maxim.