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Second-year plants develop racemes of flowers each containing 5–20 flowers. [4] The flowers are typically 5-merous with large, white petals and light green sepals, borne in mid-spring. [5] Second-year plants are also capable of growing the fruit which gives the plant's common name, the blackberry. The fruits are compound drupes which change ...
Rubus pensilvanicus, known commonly as Pennsylvania blackberry, is a prickly bramble native to eastern and central North America from Newfoundland south to Georgia, west as far as Ontario, Minnesota, Nebraska, Missouri, and Arkansas. The species is also established as a naturalized plant in California. [2] [3]
Rubus ursinus is a wide, mounding shrub or vine, growing to 0.61–1.52 metres (2–5 feet) high, and more than 1.8 m (6 ft) wide. [3] The prickly branches can take root if they touch soil, thus enabling the plant to spread vegetatively and form larger clonal colonies.
The blackberries, as well as various other Rubus species with mounding or rambling growth habits, are often called brambles. However, this name is not used for those like the raspberry that grow as upright canes, or for trailing or prostrate species, such as most dewberries, or various low-growing boreal, arctic, or alpine species.
The plant reproduces by seed, by sprouting up from the rhizome, and by layering. The stems can grow one meter (40 inches) in height in under two months. [4] [3] Rubus canadensis grows in many types of forested habitat, as well as on disturbed sites.
Rubus armeniacus, the Himalayan blackberry [2] or Armenian blackberry, is a species of Rubus in the blackberry group Rubus subgenus Rubus series Discolores (P.J. Müll.) Focke. It is native to Armenia and northern Iran , and widely invasive elsewhere.
The marionberry plant is a vigorously growing trailing vine, with some canes up to 20 feet (6.1 m) long. [1] [3] The vines have many large spines, and the fruiting laterals are long and strong, producing many berries. [6]
Rubus vestitus is a European species of brambles in the rose family, called European blackberry [2] in the United States. It is native to Europe and naturalized along the northern Pacific Coast of the United States and Canada ( British Columbia , Washington , Oregon ).