The genus Rubus, (especially the blackberries, which are often loosely referred to as Rubus fruticosus agg.) presents some of the most difficult taxonomic problems. This is partly due to the frequency of polyploidy; also to the frequent occurrence of hybridization; and also due to apomixis, where minor differences between plants are preserved because seedlings are genetically identical to their parent. As a result, differences of opinion on the number of species to be recognized from a given region can vary tremendously (for example, a treatment by M. L. Fernald[
] in 1950 recognized 205 species for the northern half of the eastern United States plus parts of southeastern Canada, whilst H. A. Gleason and A. Cronquist in 1991 recognized only 25)[
]. Where possible, a relatively conservative approach is taken here[
Rubus alpestris is a climbing or erect shrub producing each year a cluster of stems from a woody rootstock; it can grow up to 4 metres tall. The stems have rather few prickles up to 7mm long[
The edible fruit is sometimes gathered from the wild for local consumption. This species has been recommended for planting for its fruit[
Southeast Asia - northern Thailand, Vietnam, Indonesia.
Lighter places in forest and shrubland at elevations from 1,650 - 3,000 metres[
Species in this genus are generally easily grown in a good well-drained loamy soil in sun or semi-shade[
Fruit - raw[
]. The ovoid, raspberry-like fruit is about 10mm in diameter[
Seed - germinates best if given a period of cold stratification prior to sowing in containers. Stored seed requires one month stratification at about 3°c and is best sown as early as possible in the growing season. Prick out the seedlings when they are large enough to handle and grow on until large enough to plant out.
Cuttings of half-ripe wood in a frame[
Tip layering towards the end of the growing season
Division just before the plant comes into new growth or as it enters dormancy[
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