The taxonomic history of Prunus is long and complicated, in part due to the economic value of its fruit crops and also the ease with which some species hybridize. Here, Prunus is circumscribed in its broad sense based on the argument that when viewed on a worldwide scale, the morphologic discontinuities among the segregate genera diminish and they overlap with one another. Included here are species that have at times been placed in the genera Amygdalus, Armeniaca, Cerasus, Laurocerasus, Padus, and Persica.
At the species level, Prunus has been the object of the usual combining and splitting common among taxonomists with different philosophies and opinions. In particular, over-reliance on the indument of various vegetative and floral parts has led to the naming of numerous species and infraspecific taxa. Similarly, too much has been made of fruit colour and palatability in naming taxa of Prunus. It is very likely that, as molecular and genetic data are analyzed and, more importantly, correlated with morphological data, circumscriptions will be redrawn and the number of Prunus species will be reduced[
Cerasus maackii (Rupr.) Eremin & Simagin
Laurocerasus maackii (Rupr.) C.K.Schneid.
Padus maackii (Rupr.) Kom. & Aliss.
Prunus diamantina H.Lév.
Common Name: Amur Cherry
Prunus maackii is a deciduous tree with a dense, rounded, spreading crown; it can grow 4 - 16 metres tall. The bole can be around 40cm in diameter[
]. A very distinct tree through the bark of the trunk being smooth and of a striking brownish yellow colour, and peeling like that of a birch[
The tree is harvested from the wild for local use as a food. It is sometimes grown as an ornamental, valued especially for its attractive bark.
The plant (especially the seed and young shoots) contains cyanogenic glycosides, especially amygdalin and prunasin. When injested, these compounds break down in the digestive tract to release cyanide. Used in small quantities in both traditional and conventional medicine, this exceedingly poisonous compound has been shown to stimulate respiration, improve digestion, and promote a sense of well-being[
]. It is also claimed by some to be of benefit in the treatment of cancer - though this claim has been largely refuted.
In larger concentrations, however, cyanide can cause gasping, weakness, excitement, pupil dilation, spasms, convulsions, coma and respiratory failure leading to death[
The fruits and flowers of most members of this genus generally have low or very low concentrations of this toxin, though the seeds and young shoots can contain much higher levels.
The levels of toxin can be detected by the level of bitterness:- for example sweet tasting almond seeds are a major food crop and are often eaten in quantity, whilst bitter tasting almond seeds are used as a flavouring (in marzipan for example) but are not usually eaten on their own.
In general, it can be considered safe to eat any fruit or seed from species in this genus that either have a sweet flavour or are slightly bitter. Great caution should be taken, however, if the flavour is moderately to very bitter[
E. Asia - Russian Far East, northeast China, Korea
Taiga, mixed forests, rare in conifer forests and even more rare in purely broad -leaved forests, often on mountain slopes, in illuminated sites, along streams, forest edges and a clearings, and coarse rock taluses[
|Other Uses Rating||
|Cultivation Status||Ornamental, Wild
Prunus maackii is very cold-hardy, tolerating temperatures down to around -30°c when dormant. It does not do well in areas with hot, humid summers[
Prefers a position in full sun in the north of its range, though increasingly tolerant of shade the further south it grows[
]. Succeeds in an average, medium moisture, well-drained soil[
A fast-growing plant[
When used in crosses with the cultivated cherry, hybrids with quite edible fruits were obtained[
The plant is grown as an ornamental[
Most members of this genus are shallow-rooted and will produce suckers if the roots are damaged[
Plants in this genus are notably susceptible to honey fungus[
Fruit - raw or cooked. A bitter flavour with a highly stainable, dark violet juice[
]. Used to make jams, jellies and juices[
]. The black, ovoid-globose fruit is around 6mm in diameter[
Seed - raw or cooked. Do not eat the seed if it is too bitter - see the notes above on toxicity.
Although no specific mention has been seen for this species, all members of the genus contain amygdalin and prunasin, substances which break down in water to form hydrocyanic acid (cyanide or prussic acid). In small amounts this exceedingly poisonous compound stimulates respiration, improves digestion and gives a sense of well-being[
The flowers are a good source of nectar for bees[
A green dye can be obtained from the leaves[
A dark grey to green dye can be obtained from the fruit[
Seed - requires 2 - 3 months cold stratification and is best sown in a cold frame as soon as it is ripe[
]. Sow stored seed in a cold frame as early in the year as possible[
]. Protect the seed from mice etc. The seed can be rather slow, sometimes taking 18 months to germinate[
]. Prick out the seedlings into individual pots when they are large enough to handle. Grow them on in a greenhouse or cold frame for their first winter and plant them out in late spring or early summer of the following year.
Cuttings of half-ripe wood with a heel, mid summer in a frame[
Cuttings of mature wood, early autumn in a sheltered north facing border outdoors[
Layering in spring.