http://biology.umaine.edu/Amelanchier/spi.html

Lee Frelich  - May 31, 2005 
A. laevis (leaves are brownish in color when flowers are in bloom, turn 
green later) is common in boreal, near boreal, and hemlock forests around 
northern Lake Michigan and Lake Superior, but I think it occurs as far 
south as Iowa and in the Appalachian Mountains as far south as GA. It is 
definitely a cool-summer species as compared to the more southerly 
arborea. Shadbush (A. canadensis) is restricted to the far eastern U.S. 

Russ Richardson - May 31, 2005
In WV serviceberry is not extremely common but it is often encountered as 
a midstratum and understory tree in a mixed woods/dry site and generally 
does not get much more that 8" in diameter or more than 60 feet tall.

Scott Wade - May 31, 2005
I have the following different Amelanchier planted here in SE Pa.:
A. laevis
A. arborea
A. canadensis
A. obavalis
Here is a list from a website. I know that the Bartram one is endangered in Pa.
* Amelanchier alnifolia, Saskatoon Serviceberry, TSN: 25109 
* Amelanchier arborea, Downy Serviceberry, TSN: 25110 
* Amelanchier bartramiana, Oblongfruit Serviceberry, TSN: 25111 
* Amelanchier canadensis, Canadian Serviceberry, TSN: 25112 
* Amelanchier humilis, Low Serviceberry, TSN: 182045 
* Amelanchier laevis, Allegheny Serviceberry, TSN: 182046 
* Amelanchier sanguinea, Roundleaf Serviceberry, TSN: 25119 

Jess Riddle -  May 31, 2005
A. canadensis does occur in the southeast. The species is consistently
described as a shrub, and I do not believe it occurs in the southern
mountains.  In north Georgia, Downy serviceberry (A. arborea) is common in 
the dry forests on sedimentary bedrock of the Cumberland Plateau. In the
larger Blue Ridge, A. laevis dominates, and A. arborea may be absent. In the
South Carolina section of the Blue Ridge, which tends to be lower
elevation and more south facing than the Georgia section, I have only seen
A. arborea. In both SC, and on the Cumberland Plateau, A. arborea is
frequently shrubby and only occasionally reaches 40' tall. A. laevis is
north Georgia is consistently a tree and occasionally reaches 4' cbh and
60' tall although record individuals for both dimensions are much larger.

Lee Frelich - May 31, 2005
Our A. Laevis in the Upper Great Lakes is a small, but tall and thin tree
of 40 feet tall and perhaps 5-6 feet in crown width. They are very striking
when in bloom since they are snow white and surrounded by the dark conifers
white spruce, black spruce, balsam fir and white cedar. They are in bloom
now in northern MN and WI.

Darian Copiz June 1, 2005
I have come to the conclusion that Amelanchier is almost as difficult to
identify as Crataegus, except that there are much fewer of them. A.
laevis does seem to have reddish foliage when it's leafing out and A.
arborea has downy foliage when leafing out. But then there are also
those which have reddish downy foliage. They do hybridize which makes
things more difficult. Often when I am looking at them I am not
entirely sure what species they are. In the mid-Atlantic it is my
understanding that A. laevis is more common in the mountains. A.
arborea grows in the mountains, piedmont, and the coastal plain. I
think we do have A. canadensis, but I'm not sure where it grows -
possibly I have seen this, but confused it for a nother species. The
lower growing shrubby species can add to the difficulty because you
don't know when you are just looking at a stunted tree-form species. In
the nursery trade also there is a lot of confusion and mislabeling of
species. At the National Arobretum I saw a nice specimen that looked
exactly what I think A. laevis looks like, but it was labeled as A.
canadensis - a label I was very skeptical of. With some plants the
lines between species are a lot more blurred than with others. Anyone
know of some definitive attributes for ID'ing these?

Gary Beluzo June 1, 2005
According to the "Textbook of Dendrology", the genus Amelanchier comprises
about 16 species, and one or more of them is found in every state and
province of the U.S. and Canada! Of some 10 species native to the U.S., 7
reach tree size. The "Oblongleaf Juneberry" or A. canadensis, is found from
se Quebec to se United States and is most commonly found along the coast so
it probably does not grow in the Smokies. According to the Peterson Guide
to Eastern Trees the following species grow in your area:
A. laevis
A. arborea
A. sanguinea