Sorbus americana - Wikipedia

Sorbus americana – Wikipedia

The tree species Sorbus americana is often often known as the American mountain-ash.[5] It’s a deciduous perennial tree, native to japanese North America.[2]

The American mountain-ash and associated species (most frequently the European mountain-ash, Sorbus aucuparia) are additionally known as rowan bushes.


Sorbus americana is a comparatively small tree, reaching 12 metres (40 ft) in peak.[2] The American mountain-ash attains its largest specimens on the northern shores of Lake Huron and Lake Superior.[6]

It resembles the European mountain-ash, Sorbus aucuparia.

Mild grey, clean, floor scaly. Branchlets downy at first, later turn out to be clean, brown tinged with purple, lenticular, lastly they turn out to be darker and the papery outer layer turns into simply separable.
Pale brown; gentle, delicate, close-grained however weak. Particular gravity, 0.5451; weight of cu. ft., 33.97 lbs.
Winter buds
Darkish purple, acute, one-fourth to three-quarters of an inch lengthy. Interior scales are very tomentose and enlarge with the rising shoot.
Alternate, compound, odd-pinnate, 6 to 10 inches (15 to 25 cm) lengthy, with slender, grooved, darkish inexperienced or purple petiole. Leaflets 13 to 17, lanceolate or lengthy oval, two to 3 inches lengthy, one-half to two-thirds broad, unequally wedge-shaped or rounded at base, serrate, acuminate, sessile, the terminal one typically borne on a stalk half an inch lengthy, feather-veined, midrib outstanding beneath, grooved above. They arrive out of the bud downy, conduplicate; when full grown are clean, darkish yellow inexperienced above and paler beneath. In autumn they flip a transparent yellow. Stipules leaf-like, caducous.
Could, June, after the leaves are full grown. Excellent, white, one-eighth of an inch throughout, borne in flat compound cymes three or 4 inches throughout. Bracts and bractlets acute, minute, caducous.
Urn-shaped, furry, five-lobed; lobes, brief, acute, imbricate in bud.
Petals 5, creamy white, orbicular, contracted into brief claws, inserted on calyx, imbricate in bud.
Twenty to thirty, inserted on calyx tube; filaments thread-like; anthers introrse, two-celled; cells opening longitudinally.
Two to 3 carpels inserted within the backside of the calyx tube and united into an inferior ovary. Types two to 3; stigmas capitate; ovules two in every cell.
Berry-like pome, globular, one-quarter of an inch throughout, shiny purple, borne in cymous clusters. Ripens in October and stays on the tree all winter. Flesh skinny and bitter, charged with malic acid; seeds gentle brown, rectangular, compressed; cotyledons fleshy.[6]


Native to japanese North America;

  • Jap Canada – New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward Island, Quebec[7]
  • Northeastern United States – Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Vermont
  • North-Central United States – Illinois [n. (Ogle Co.)], Michigan, Minnesota, Wisconsin. Listed as endangered by the State of Illinois[8]
  • Southeastern United States – Appalachian Mountains, Georgia, Maryland, North Carolina, Tennessee, Virginia, West Virginia

The berries of American mountain-ash are eaten by quite a few species of birds, together with ruffed grouse, ptarmigans, sharp-tailed grouse, blue grouse, American robins, different thrushes, waxwings, jays, and small mammals, akin to squirrels and rodents.[9]

American mountain-ash is a most popular browse for moose and white-tailed deer. Moose will eat foliage, twigs, and bark. As much as 80 % of American mountain-ash stems have been browsed by moose in management plots adjoining to exclosures on Isle Royale. Fishers, martens, snowshoe hares, and ruffed grouse additionally browse American mountain-ash.[9]


Sorbus americana is cultivated as a decorative tree, to be used in gardens and parks. It prefers a wealthy moist soil and the borders of swamps, however will flourish on rocky hillsides.

A cultivar is the purple cascade mountain-ash, or Sorbus americana ‘Dwarfcrown’. It’s planted in gardens, and as a avenue tree.[10]


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