![]() Common borage can be differentiated from common comfrey as it is an annual and has bowl- opposed to bell-shaped flowers. Prickly comfrey can be differentiated from common comfrey by the absence of stem ridges on its internodes. Similar species: Common comfrey looks similar to two other non-native plants that are tracked in Alaska: prickly comfrey (Symphytum asperum) and common borage (Borago officinalis). Seeds are are glossy black, 4 or 5 mm long, and 3 mm wide (DiTomaso and Healy 2007, Klinkenberg 2010, NatureGate 2010). Nutlets attach to the base of the flower, and contain 1 seed each. Flowers are comprised of five petals, fused into a bell shape. They can be deep purple, pale purple, blue, pink, or cream colored. Flowers are radially symmetrical and 12 to 18 mm long. The inflorescences consist of several to many pairs of drooping, coiled flowers. ![]() They usually have shorter petioles but are sometimes sessile. Stem leaves are 5 to 15 cm long, oblong-lanceolate, long-tapering, entire, and alternate. Basal leaves are obovate to oblong, 15 to 30 cm long, and 7 to 12 cm wide with long petioles. Stem ridges, which run down the stems from the leaf bases, are present on the internodes. The plant is covered in spreading, downwardcurved, conical, bristly hairs. Description Common comfrey is a perennial herb that grows between 50 and 150 cm tall from a thick, branched taproot. The ranks are scaled from 0 to 100, with 0 representing a plant that poses no threat to native ecosystems and 100 representing a plant that poses a major threat to native ecosystems. Other common names: asses-ears, backwort, boneset, bruisewort, consolida, consound, gum plant, knitback, knit-bone, slippery-root Family: Boraginaceae Invasiveness Rank: 48 The invasiveness rank is calculated based on a species’ ecological impacts, biological attributes, distribution, and response to control measures. uliginosum (Kern.) Nyman, Symphytum uliginosum Kern.
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