Rubus villosus var. montanus Porter 1890 not Rubus montanus Lib. ex Lej. 1813
Rubus montanus (Porter) Porter 1894 not Lib. ex Lej. 1813
Rubus alleghaniensis Porter
Rubus allegheniensis var. nigrobaccus (L.H.Bailey) Farw.
Rubus allegheniensis var. plausus L.H.Bailey
Rubus allegheniensis var. populifolius Fernald
Rubus attractus L.H.Bailey
Rubus auroralis L.H.Bailey
Rubus avipes L.H.Bailey
Rubus bractealis L.H.Bailey
Rubus campestris P.J.Müll.
Rubus congruus L.H.Bailey
Rubus fissidens L.H.Bailey
Rubus floricomus Blanch.
Rubus fryei H.A.Davis & T.Davis
Rubus latens L.H.Bailey
Rubus longissimus L.H.Bailey
Rubus nigrobaccatus Focke
Rubus nigrobaccus L.H.Bailey
Rubus nigrobaccus var. sativus (L.H.Bailey) L.H.Bailey
Rubus nuperus L.H.Bailey
Rubus par L.H.Bailey
Rubus paulus L.H.Bailey
Rubus pennus L.H.Bailey
Rubus rappii L.H.Bailey
Rubus separ L.H.Bailey
Rubus villosus Aiton
Rubus villosus var. engelmannii Focke
Rubus villosus var. montanus Porter
Rubus villosus var. sativus L.H.Bailey
Rubus villosus var. villigerus Focke
Rubus gravesii (Fernald) L.H.Bailey
Rubus marilandicus L.H.Bailey
Rubus nigrobaccus var. gravesii Fernald
Rubus tumularis L.H.Bailey
Rubus uber L.H.Bailey
Rubus virginianus L.H.Bailey
Rubus allegheniensis is a North American species of highbush blackberry in Section Alleghenienses of the genus Rubus, a member of the rose family.[6] It is the most common and widespread highbush blackberry in eastern and central North America. It is commonly known as Allegheny blackberry.[7]
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. The leaves are alternate, compound, ovoid, and have toothed edges.[8][9] The canes have many prickles, with white, 5-petal, 19-millimetre (3⁄4-inch) flowers in late spring and glossy, deep-violet to black, aggregate fruit in late summer.[8] It is shade intolerant.[10]
Many mammals eat the fruit, including elk, foxes, American black bears, rabbits, raccoons, opossums, squirrels, mice, and chipmunks, and deer will browse the young canes. Blackberries are also an important food source for many species of birds. The mammals and birds that eat the fruit then disperse the seed in their droppings, enabling the plant to spread to new locations. A wide variety of native bees, butterflies, beetles, flies, ants, wasps, and other insects are attracted to the nectar and pollen of the flowers, and caterpillars, grasshoppers, beetles eat the leaves. Birds and small mammals use the thickets formed by the canes for shelter.[8]
The presence of the species influences the dynamics of the understory vegetation of many forests in the eastern United States. An abundance of R. allegheniensis encourages new tree seedlings. Where the effects of herbivorous animals (such as whitetail deer) reduce the abundance of Allegheny blackberry, a competitor, Sitobolium punctilobulum (hay-scented fern), takes over; where S. punctilobulum becomes common, the growth of tree seedlings is restricted.[13]
Concentrations of R. allegheniensis increase greatly after events that destroy taller shrubs and trees and thus permit more light into the understory, such as fires or widespread blowdown.[10][14] These populations often decline in later years as the tree seedlings sheltered by the blackberry canes grow and reduce the amount of light reaching the lower levels.[10]
^Bailey, L.H. (1944b). "Species batorum. The genus Rubus in North America. VIII. Alleghenienses". Gentes Herbarum. 3: 504–588.
^USDA, NRCS (n.d.). "Rubus allegheniensis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 23 October 2015.
^ abcPeterson, Chris J., and Steward T.A. Pickett. "Forest reorganization: a case study in an old-growth forest catastrophic blowdown." Ecology. 76 (1995): 763+. Retrieved 14 Oct. 2012.
