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 asper myriadenus (H.Lév. & Vaniot) Focke
Rubus dolichocephalus Hayata
Rubus eustephanus glandulosus Koidz.
Rubus indotibetanus Koidz.
Rubus myriadenus H.Lév. & Vaniot
Rubus sorbifolius Maxim.
Rubus sumatranus is an erect or scrambling to semi-scandent shrub producing a cluster of stems fom a woody rotstock; the plant can grow up to 2 metres tall[
The edible fruit is gathered from the wild for local consumption.
E. Asia - southern China, Japan, northeast India, Thailand, Laos, Vietnam, Malaysia, Indonesia.
Clearings, roadsides, thickets, tea plantations, forest borders, and similar open places, very rarely reported from lighter types of forest, at elevations from 500 - 2,000 metres in Malaya and Indonesia[
Rubus sumatranus is native to the warm temperate and subtropical zones of southern and eastern China (hardiness zones 8 and higher) moving through tropical Asia to Indonesia.
Species in this genus are generally easily grown in a good well-drained loamy soil in sun or semi-shade[
Fruit - raw[
]. A pleasant flavour[
]. The ellipsoid, orange-red to red fruit is up to 18mm long and 11mm wide[
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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