The distinction between Rubus deliciosus and Rubus neomexicanus is not always clear, especially when the former has more narrowly obtuse lobes and denser leaf abaxial hairs. Rubus deliciosus is also similar to Rubus bartonianus of Idaho and Oregon, as well as the Mexican Rubus trilobus Seringe. It might be reasonable to recognize a broader concept of Rubus deliciosus, one containing multiple infraspecific. Rubus deliciosus and its close relatives require a revisionary study[
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: Barton's Raspberry
Rubus bartonianus is a deciduous shrub producing each year a cluster of erect, unarmed, stems 80 - 250cm tall from a woody rootstock[
The plant is harvested from the wild for local use as a food.
Known only from the Snake River Canyon in Oregon and Idaho, the plant is of conservation concern[
Western N. America - Oregon, Idaho
Dry, rocky slopes; at elevations from 300 - 400 metres[
]. Forming thickets along the sides of streams at elevations from 300 - 1,400 metres.
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[
Fruit - raw or cooked. The deep red, hemispherical fruit is up to 10mm in diameter[
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[