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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 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.
Cercosporella rubi is a plant pathogenic fungus which causes blackberry rosette, [1] a disease that is also known as double blossom [2] or witches' broom [3] of blackberry. In infected plants, the symptoms that C. rubi causes are double blossoms as well as witches' brooms .
Blackberry plants naturally produce stems called canes that live for only two years before dying and being replaced by new stems. The first-year canes arise from the base or crown of the plant and ...
Rubus, or Bramble, [4] is a large and diverse genus of flowering plants in the rose family, Rosaceae, subfamily Rosoideae, most commonly known as brambles. [3] [5] [6] Fruits of various species are known as raspberries, blackberries, dewberries, and bristleberries.
The characteristics of Rubus allegheniensis can be highly variable. [8] It is an erect bramble, typically 1.5 metres (5 feet) but occasionally rarely over 2.4 m (8 ft) high, with single shrubs approaching 2.4 m or more in breadth, although it usually forms dense thickets of many plants.
Himalayan blackberry flower, Bay Area, California. Note spider on bottom petal. 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. Both its ...
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]