Opposite Twig Configurations of Trees in Canada

These Canadian species have opposite twig configuration (as seen in thumbnail). One (1) asterisk means the tree is introduced (not native). Two (2) asterisks means the tree is not native but is naturalized (reproducing itself). "(Genus)" means the hint refers to a genus of opposite-twig trees, while "(species)" means the hint refers to a tree that is unique from the rest of its genus/family. Latin names (G+s), common names, and alternative names will be accepted.
Note: Some of these genera have alternate twig species
Thumbnail from https://www.treeguideuk.co.uk/buds-opposite/
Information taken from "Trees In Canada' by John Laird Farrar
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Last updated: April 9, 2025
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First submittedApril 1, 2025
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Hint
Answer
M (Genus)
Maples (Acer)
SuM
Sugar Maple (Acer saccharum)
BlM
Black Maple (Acer nigrum)
BiM
Bigleaf Maple (Acer macrophyllum)
RM
Red Maple (Acer rubrum)
SiM
Silver Maple (Acer saccharinum)
MaM
Manitoba Maple (Acer negundo)
MoM
Mountain Maple (Acer spicatum)
StM
Striped Maple (Acer pensylvanicum)
DM
Douglas Maple (Acer glabrum)
VM
Vine Maple (Acer circinatum)
SyM*
Sycamore Maple (Acer pseudoplatanus)
NM**
Norway Maple (Acer platanoides)
AM*
Amur Maple (Acer ginnala)
JM*
Japanese Maple (Acer palmatum)
OB (species)
Ohio Buckeye (Aesculus glabra)
HC (species) **
Horse Chestnuts (Aesculus hippocastanum)
RC (species)*
Red Horsechestnut (Aesculus xcarnea)
A (Genus)
Ashes (Fraxinus)
WA
White Ash (Fraxinus americana)
GA
Green Ash (Fraxinus pennsylvanica)
BlaA
Black Ash (Fraxinus nigra)
BluA
Blue Ash (Fraxinus quadrangulata)
OA
Oregon Ash (Fraxinus latifolia)
PA
Pumpkin Ash (Fraxinus profunda)
EA*
European Ash (Fraxinus excelsior)
AC (species)*
Amur Corktree (Phellodendron amurense)
El (Genus)
Elders (Sambucus)
BlaE
Black-Berry Elder (Sambucus melanocarpa)
AE
American Elder (Sambucus canadensis)
ERE
Eastern Red Elderberry (Sambucus pubens)
BluE
Blue-Berry Elder (Sambucus cerulea)
RE
Red-Berry Elder (Sambucus callicarpa)
Cr (Genus)
Cranberries (Viburnums)
SwV
Sweet Viburnum (Viburnum lentago)
ECV**
European Cranberry Viburnum (Viburnum opulus)
WV**
Wayfaring Viburnum (Viburnum lantana)
SqV
Squashberry Viburnum (Vibrunum edule)
CV
Cranberry Viburnum (Viburnum trilobum)
D (Genus)
Dogwoods (Cornus)
EFD
Eastern Flowering Dogwood (Cornus florida)
WFD
Western Flowering Dogwood (Cornus nuttallii)
CC*
Cornelian-Cherry (Cornus mas)
KD*
Kousa Dogwood (Cornus kousa)
CL (species)**
Common Lilac (Syringa vulgaris)
Ca (Genus - whorled)
Catalpas (Catalpa)
NC*
Northern Catalpa (Catalpa speciosa)
SC*
Southern Catalpa (Catalpa bignonioides)
Eu (Genus)
Euonymus (Euonymus)
BuE
Burning-Bush Euonymus (Euonymus atropurpureus)
EuE*
European Euonymus (Euonymus europaeus)
W-CE*
Winter-Creeper Euonymus (Euonymus fortunei)
WiE*
Winged Euonymus (Euonymus alatus)
BuB (species)
Button-Bush (Cephalantus occidentalis)
KT (species)*
Katsura-Tree (Cercidiphyllum japonicum)
SB (species)
Silver Buffalo-Berry (Sherpherdia argentea)
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