Recognized as a distinct species in the USDA 'Plants Database' https://plants.usda.gov/core/profile?symbol=RUPA13, this species is treated as a synonym of Rubus pensilvanicus Poir., in the Flora of N. America[
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[
Common Name: Silver Creek Blackberry
Rubus parcifrondifer is a deciduous shrub, producing each year a cluster of prickly, erect to arching, biennial stems from a woody rootstock; the stems can be 200 - 300cm long[
]. The stems only produce leaves, and do not flower, in their first year of growth; forming flowering branches in their second year and then dying after fruiting.
The plant is harvested from the wild for local use as a food. It has been cultivated as a fruit crop in N. America, the cultivars 'Wilson Early' and 'Rathbun blackberry' are supposed to have been developed from this species[
Eastern N. America - New York, New Jersey.
Thickets, borders of woods and clearings[
|Other Uses Rating
Species in this genus are generally easily grown in a good well-drained loamy soil in sun or semi-shade[
Plants in this genus are notably susceptible to honey fungus[
According to one report this species is no more than a synonym for Rubus pensylvanicus[
Fruit - raw or cooked[
]. The black, globose to cylindrical fruit is around 10 - 20mm in diameter270].
A purple to dull blue dye is obtained from the fruit[
Seed - requires stratification and is best sown in early autumn in a cold frame. Stored seed requires one month stratification at about 3°c and is best sown as early as possible in the year. Prick out the seedlings when they are large enough to handle and grow on in a cold frame. Plant them out into their permanent positions in late spring of the following year.
Cuttings of half-ripe wood, mid summer in a frame[
Tip layering in July. Plant out in autumn.
Division in early spring or just before leaf-fall in the autumn[