We currently have a total of 169 comparison guides, with 102 completed and published, and 67 incomplete guides under construction.
Guide | Date Started↓ | Date Updated |
Field Thistle (Cirsium vulgare) vs. Bull Thistle (Cirsium vulgare) | Mar 08, 2023 | Mar 08, 2023 |
Virginia Creeper (Eleutherococcus sieboldianus) vs. Five-Fingered Aralia (Eleutherococcus sieboldianus) | Feb 24, 2023 | Feb 24, 2023 |
Norway Spruce (Picea orientalis) vs. Caucasian Spruce (Picea orientalis) | Jan 16, 2023 | Jan 16, 2023 |
Loblolly Pine (Pinus elliottii) vs. Slash Pine (Pinus elliottii) | Jan 08, 2023 | Jan 24, 2023 |
Shortleaf Pine (Pinus strobus) vs. Eastern White Pine (Pinus strobus) | Jan 04, 2023 | Jan 05, 2023 |
Pitch Pine (Pinus taeda) vs. Loblolly Pine (Pinus taeda) | Jan 03, 2023 | Feb 04, 2023 |
Shortleaf Pine (Pinus taeda) vs. Loblolly Pine (Pinus taeda) | Jan 02, 2023 | Jan 07, 2023 |
Loblolly Pine (Pinus strobus) vs. Eastern White Pine (Pinus strobus) | Jan 02, 2023 | Jan 08, 2023 |
Early Wildrye (Elymus riparius) vs. Riverbank Wildrye (Elymus riparius) | Dec 31, 2022 | Dec 31, 2022 |
Canada Wildrye (Elymus glabriflorus) vs. Southeastern Wildrye (Elymus glabriflorus) | Dec 28, 2022 | Jan 30, 2023 |
Canada Wildrye (Elymus riparius) vs. Riverbank Wildrye (Elymus riparius) | Dec 15, 2022 | Feb 13, 2023 |
Early Wildrye (Elymus glabriflorus) vs. Southeastern Wildrye (Elymus glabriflorus) | Dec 08, 2022 | Dec 27, 2022 |
Wingstem (Verbesina occidentalis) vs. Yellow Crownbeard (Verbesina occidentalis) | Nov 30, 2022 | Nov 30, 2022 |
Riverbank Wildrye (Elymus villosus) vs. Silky Wild Rye (Elymus villosus) | Nov 26, 2022 | Dec 29, 2022 |
Purpletop (Sorghum halepense) vs. Johnsongrass (Sorghum halepense) | Nov 13, 2022 | Nov 16, 2022 |
Rhomboid Mercury (Acalypha australis) vs. Asian Copperleaf (Acalypha australis) | Jul 08, 2022 | Feb 02, 2023 |
White Avens (Geum vernum) vs. Spring Avens (Geum vernum) | Jun 18, 2022 | Jul 01, 2022 |
Annual Fleabane (Erigeron philadelphicus) vs. Philadelphia Fleabane (Erigeron philadelphicus) | Jun 17, 2022 | Jun 17, 2022 |
Clustered Blacksnakeroot (Sanicula smallii) vs. Small's Blacksnakeroot (Sanicula smallii) | May 31, 2022 | May 31, 2022 |
Canadian Blacksnakeroot (Sanicula smallii) vs. Small's Blacksnakeroot (Sanicula smallii) | May 08, 2022 | May 31, 2022 |
Maryland Sanicle (Sanicula odorata) vs. Clustered Blacksnakeroot (Sanicula odorata) | May 06, 2022 | May 31, 2022 |
Canadian Blacksnakeroot (Sanicula trifoliata) vs. Largefruit Blacksnakeroot (Sanicula trifoliata) | May 06, 2022 | May 06, 2022 |
Canadian Blacksnakeroot (Sanicula odorata) vs. Clustered Blacksnakeroot (Sanicula odorata) | May 06, 2022 | May 09, 2022 |
Canadian Blacksnakeroot (Sanicula marilandica) vs. Maryland Sanicle (Sanicula marilandica) | May 06, 2022 | May 06, 2022 |
Late Boneset (Eupatorium altissimum) vs. Tall Thoroughwort (Eupatorium altissimum) | Nov 06, 2021 | Aug 17, 2022 |
Butterfly Milkweed (Asclepias curassavica) vs. Tropical Milkweed (Asclepias curassavica) | Oct 05, 2021 | Oct 05, 2021 |
Common Milkweed (Asclepias purpurascens) vs. Purple Milkweed (Asclepias purpurascens) | Oct 04, 2021 | Oct 05, 2021 |
Partridge Pea (Chamaecrista nictitans) vs. Sensitive Partridge Pea (Chamaecrista nictitans) | Sep 20, 2021 | Sep 30, 2021 |
Shortleaf Pine (Pinus virginiana) vs. Virginia Pine (Pinus virginiana) | Jan 27, 2021 | Jan 02, 2023 |
American Holly (Ilex aquifolium) vs. European Holly (Ilex aquifolium) | Jan 19, 2021 | Jan 26, 2021 |
Water Oak (Quercus phellos) vs. Willow Oak (Quercus phellos) | Jan 11, 2021 | Aug 25, 2022 |
Swamp Chestnut Oak (Quercus muehlenbergii) vs. Chinquapin Oak (Quercus muehlenbergii) | Jan 06, 2021 | Jan 06, 2021 |
Swamp Chestnut Oak (Quercus montana) vs. Chestnut Oak (Quercus montana) | Dec 21, 2020 | Dec 22, 2020 |
Chestnut Oak (Quercus muehlenbergii) vs. Chinquapin Oak (Quercus muehlenbergii) | Dec 21, 2020 | Jan 05, 2021 |
Lemon Balm (Nepeta cataria) vs. Catnip (Nepeta cataria) | Dec 17, 2020 | Dec 17, 2020 |
Bear Oak (Quercus marilandica) vs. Blackjack Oak (Quercus marilandica) | Oct 20, 2020 | Oct 20, 2020 |
Redstar (Ipomoea hederifolia) vs. Scarlet Creeper (Ipomoea hederifolia) | Oct 14, 2020 | Oct 16, 2020 |
Bear Oak (Quercus velutina) vs. Black Oak (Quercus velutina) | Oct 01, 2020 | Oct 01, 2020 |
Blackjack Oak (Quercus nigra) vs. Water Oak (Quercus nigra) | Oct 01, 2020 | Oct 01, 2020 |
Coastal Plain Joe Pye Weed (Eutrochium purpureum) vs. Sweetscented Joe Pye Weed (Eutrochium purpureum) | Sep 21, 2020 | Jun 16, 2022 |
Sweetscented Joe Pye Weed (Eutrochium maculatum) vs. Spotted Joe Pye Weed (Eutrochium maculatum) | Sep 21, 2020 | Apr 23, 2021 |
Coastal Plain Joe Pye Weed (Eutrochium fistulosum) vs. Trumpetweed (Eutrochium fistulosum) | Sep 19, 2020 | Sep 19, 2020 |
Trumpetweed (Eutrochium maculatum) vs. Spotted Joe Pye Weed (Eutrochium maculatum) | Sep 19, 2020 | Sep 25, 2020 |
Coastal Plain Joe Pye Weed (Eutrochium maculatum) vs. Spotted Joe Pye Weed (Eutrochium maculatum) | Sep 19, 2020 | Sep 21, 2020 |
Common Hop (Humulus japonicus) vs. Japanese Hop (Humulus japonicus) | Sep 16, 2020 | Sep 16, 2020 |
Atlantic White Cedar (Thuja occidentalis) vs. Northern White-Cedar (Thuja occidentalis) | Sep 01, 2020 | Mar 30, 2022 |
Atlantic White Cedar (Juniperus virginiana) vs. Eastern Redcedar (Juniperus virginiana) | Sep 01, 2020 | Sep 01, 2020 |
Eastern Redcedar (Thuja occidentalis) vs. Northern White-Cedar (Thuja occidentalis) | Sep 01, 2020 | Sep 01, 2020 |
White Oak (Quercus bicolor) vs. Swamp White Oak (Quercus bicolor) | Aug 31, 2020 | Aug 31, 2020 |
American Sycamore (Platanus ×hispanica) vs. London Planetree (Platanus ×hispanica) | Jul 24, 2020 | Jul 24, 2020 |
Swamp White Oak (Quercus macrocarpa) vs. Bur Oak (Quercus macrocarpa) | Jul 01, 2020 | Mar 03, 2022 |
Smooth Sumac (Rhus typhina) vs. Staghorn Sumac (Rhus typhina) | Jun 28, 2020 | Sep 23, 2021 |
Northern Red Oak (Quercus ellipsoidalis) vs. Hill's Oak (Quercus ellipsoidalis) | Mar 04, 2020 | Feb 15, 2021 |
American Bittersweet (Celastrus orbiculatus) vs. Oriental Bittersweet (Celastrus orbiculatus) | Feb 25, 2020 | Jul 25, 2020 |
Paper Birch (Betula pendula) vs. European White Birch (Betula pendula) | Feb 16, 2020 | Jul 28, 2020 |
Gray Birch (Betula pendula) vs. European White Birch (Betula pendula) | Feb 16, 2020 | Jul 25, 2020 |
Paper Birch (Betula cordifolia) vs. Mountain Paper Birch (Betula cordifolia) | Feb 11, 2020 | Jul 24, 2020 |
Gray Birch (Betula papyrifera) vs. Paper Birch (Betula papyrifera) | Feb 02, 2020 | Dec 15, 2021 |
Sweetbay Magnolia (Magnolia grandiflora) vs. Southern Magnolia (Magnolia grandiflora) | Jan 16, 2020 | Jan 16, 2020 |
White Spruce (Abies balsamea) vs. Balsam Fir (Abies balsamea) | Dec 29, 2019 | Dec 29, 2019 |
White Spruce (Picea abies) vs. Norway Spruce (Picea abies) | Dec 17, 2019 | Jul 24, 2020 |
Red Maple (Acer pseudoplatanus) vs. Sycamore Maple (Acer pseudoplatanus) | Dec 05, 2019 | Apr 28, 2021 |
Norway Maple (Acer pseudoplatanus) vs. Sycamore Maple (Acer pseudoplatanus) | Dec 05, 2019 | Jul 23, 2020 |
Sugar Maple (Acer nigrum) vs. Black Maple (Acer nigrum) | Dec 05, 2019 | Dec 06, 2019 |
Balsam Fir (Picea mariana) vs. Black Spruce (Picea mariana) | Dec 03, 2019 | Nov 01, 2021 |
Eastern White Pine (Pinus resinosa) vs. Red Pine (Pinus resinosa) | Dec 01, 2019 | Dec 17, 2021 |
Eastern Hemlock (Picea abies) vs. Norway Spruce (Picea abies) | Dec 01, 2019 | Dec 29, 2019 |
Eastern Hemlock (Abies balsamea) vs. Balsam Fir (Abies balsamea) | Dec 01, 2019 | Jul 28, 2020 |
White Spruce (Picea rubens) vs. Red Spruce (Picea rubens) | Dec 01, 2019 | Dec 29, 2019 |
White Ash (Fraxinus nigra) vs. Black Ash (Fraxinus nigra) | Nov 24, 2019 | Nov 24, 2019 |
Black Ash (Fraxinus pennsylvanica) vs. Green Ash (Fraxinus pennsylvanica) | Nov 24, 2019 | Mar 24, 2021 |
White Ash (Fraxinus pennsylvanica) vs. Green Ash (Fraxinus pennsylvanica) | Nov 22, 2019 | Jun 23, 2020 |
Red Spruce (Picea abies) vs. Norway Spruce (Picea abies) | Nov 20, 2019 | Dec 29, 2019 |
White Spruce (Picea mariana) vs. Black Spruce (Picea mariana) | Nov 19, 2019 | Feb 27, 2022 |
Sweet Birch (Betula alleghaniensis) vs. Yellow Birch (Betula alleghaniensis) | Nov 10, 2019 | Nov 11, 2019 |
Red Mulberry (Morus alba) vs. White Mulberry (Morus alba) | Nov 07, 2019 | Apr 04, 2021 |
Northern Red Oak (Quercus palustris) vs. Pin Oak (Quercus palustris) | Nov 06, 2019 | Jul 30, 2020 |
Scarlet Oak (Quercus velutina) vs. Black Oak (Quercus velutina) | Nov 06, 2019 | Mar 31, 2023 |
Northern Red Oak (Quercus coccinea) vs. Scarlet Oak (Quercus coccinea) | Nov 06, 2019 | Nov 06, 2019 |
Pin Oak (Quercus coccinea) vs. Scarlet Oak (Quercus coccinea) | Nov 06, 2019 | Oct 18, 2022 |
Pitch Pine (Pinus strobus) vs. Eastern White Pine (Pinus strobus) | Nov 01, 2019 | Nov 01, 2019 |
Red Pine (Pinus sylvestris) vs. Scots Pine (Pinus sylvestris) | Nov 01, 2019 | Dec 20, 2021 |
Greater Celandine (Stylophorum diphyllum) vs. Celandine Poppy (Stylophorum diphyllum) | Oct 31, 2019 | May 24, 2021 |
Eastern Black Walnut (Ailanthus altissima) vs. Tree of Heaven (Ailanthus altissima) | Oct 31, 2019 | Oct 31, 2019 |
Eastern Black Walnut (Juglans cinerea) vs. Butternut (Juglans cinerea) | Oct 31, 2019 | Jul 28, 2020 |
Tree of Heaven (Rhus typhina) vs. Staghorn Sumac (Rhus typhina) | Oct 31, 2019 | Sep 23, 2021 |
Flowering Dogwood (Cornus kousa) vs. Kousa Dogwood (Cornus kousa) | Oct 30, 2019 | Apr 20, 2020 |
Red Maple (Acer saccharinum) vs. Silver Maple (Acer saccharinum) | Oct 23, 2019 | Dec 29, 2019 |
Silver Maple (Acer saccharum) vs. Sugar Maple (Acer saccharum) | Oct 23, 2019 | Oct 23, 2019 |
Red Maple (Acer spicatum) vs. Mountain Maple (Acer spicatum) | Oct 23, 2019 | Dec 04, 2019 |
Norway Maple (Acer rubrum) vs. Red Maple (Acer rubrum) | Oct 23, 2019 | Oct 25, 2019 |
White Oak (Quercus macrocarpa) vs. Bur Oak (Quercus macrocarpa) | Oct 20, 2019 | Jul 24, 2020 |
Pale Touch-Me-Not (Impatiens capensis) vs. Jewelweed (Impatiens capensis) | Oct 20, 2019 | Oct 26, 2021 |
American Beech (Fagus sylvatica) vs. European Beech (Fagus sylvatica) | Oct 20, 2019 | Oct 29, 2019 |
Eastern Poison Ivy (Parthenocissus tricuspidata) vs. Boston Ivy (Parthenocissus tricuspidata) | Oct 19, 2019 | Dec 29, 2019 |
Box Elder (Toxicodendron radicans) vs. Eastern Poison Ivy (Toxicodendron radicans) | Oct 19, 2019 | Oct 21, 2019 |
Eastern Poison Ivy (Rhus aromatica) vs. Fragrant Sumac (Rhus aromatica) | Oct 19, 2019 | Oct 29, 2019 |
Northern Red Oak (Quercus velutina) vs. Black Oak (Quercus velutina) | Oct 18, 2019 | Jan 23, 2021 |
White Snakeroot (Eupatorium serotinum) vs. Late Boneset (Eupatorium serotinum) | Oct 18, 2019 | Oct 29, 2019 |
Norway Maple (Acer saccharum) vs. Sugar Maple (Acer saccharum) | Oct 17, 2019 | Jan 20, 2021 |
Rhomboid Mercury (Acalypha virginica) vs. Virginia Threeseed Mercury (Acalypha virginica) | Oct 16, 2019 | Jul 11, 2022 |
Red Maple (Acer saccharum) vs. Sugar Maple (Acer saccharum) | Oct 15, 2019 | Oct 23, 2019 |
These guides are incomplete and under construction, and are more likely to have errors in them. Use them at your own risk; when in doubt double-check other sources before relying on them for definitive ID.
Guide | Date Started↓ | Date Updated |
Honeylocust (Robinia pseudoacacia) vs. Black Locust (Robinia pseudoacacia) | Mar 31, 2023 | Mar 31, 2023 |
Black Locust (Robinia hispida) vs. Bristly Locust (Robinia hispida) | Mar 30, 2023 | Mar 30, 2023 |
Pond Pine (Pinus taeda) vs. Loblolly Pine (Pinus taeda) | Feb 03, 2023 | Feb 03, 2023 |
Virginia Pine (Pinus banksiana) vs. Jack Pine (Pinus banksiana) | Jan 02, 2023 | Jan 02, 2023 |
Scarlet Oak (Quercus shumardii) vs. Shumard's Oak (Quercus shumardii) | Dec 27, 2022 | Dec 27, 2022 |
Canada Wildrye (Elymus villosus) vs. Silky Wild Rye (Elymus villosus) | Dec 13, 2022 | Dec 13, 2022 |
Virginia Wildrye (Elymus glabriflorus) vs. Southeastern Wildrye (Elymus glabriflorus) | Dec 08, 2022 | Dec 18, 2022 |
Early Wildrye (Elymus virginicus) vs. Virginia Wildrye (Elymus virginicus) | Nov 28, 2022 | Dec 22, 2022 |
Canada Wildrye (Elymus virginicus) vs. Virginia Wildrye (Elymus virginicus) | Nov 26, 2022 | Nov 26, 2022 |
Swamp Tupelo (Nyssa sylvatica) vs. Black Tupelo (Nyssa sylvatica) | Nov 21, 2022 | Nov 21, 2022 |
Broomsedge Bluestem (Schizachyrium scoparium) vs. Little Bluestem (Schizachyrium scoparium) | Nov 04, 2022 | Nov 04, 2022 |
Longleaf Pine (Pinus elliottii) vs. Slash Pine (Pinus elliottii) | Oct 31, 2022 | Oct 31, 2022 |
Rhomboid Mercury (Acalypha gracilens) vs. Slender Threeseed Mercury (Acalypha gracilens) | Jul 11, 2022 | Jul 11, 2022 |
Virginia Threeseed Mercury (Acalypha gracilens) vs. Slender Threeseed Mercury (Acalypha gracilens) | Jul 11, 2022 | Jul 11, 2022 |
Tall Blue Lettuce (Lactuca floridana) vs. Woodland Lettuce (Lactuca floridana) | Jul 06, 2022 | Jul 06, 2022 |
Sweetscented Joe Pye Weed (Eutrochium steelei) vs. Appalachian Joe-Pye Weed (Eutrochium steelei) | Jul 05, 2022 | Jan 01, 2023 |
Early Meadow-Rue (Thalictrum pubescens) vs. King of the Meadow (Thalictrum pubescens) | Jul 02, 2022 | Jul 02, 2022 |
King of the Meadow (Thalictrum revolutum) vs. Waxyleaf Meadow-Rue (Thalictrum revolutum) | Jul 02, 2022 | Jul 02, 2022 |
White Avens (Geum virginianum) vs. Cream Avens (Geum virginianum) | Jul 01, 2022 | Jul 01, 2022 |
White Avens (Geum laciniatum) vs. Rough Avens (Geum laciniatum) | Jun 18, 2022 | Jun 18, 2022 |
Daisy Fleabane (Erigeron annuus) vs. Annual Fleabane (Erigeron annuus) | Jun 17, 2022 | Jun 17, 2022 |
Philadelphia Fleabane (Erigeron pulchellus) vs. Robin's Plantain (Erigeron pulchellus) | Jun 17, 2022 | Jun 17, 2022 |
Honewort (Cryptotaenia japonica) vs. Japanese Honewort (Cryptotaenia japonica) | May 06, 2022 | May 06, 2022 |
Austrian Pine (Pinus resinosa) vs. Red Pine (Pinus resinosa) | Dec 22, 2021 | Dec 22, 2021 |
Smooth Blue Aster (Symphyotrichum puniceum) vs. Purplestem aster (Symphyotrichum puniceum) | Nov 30, 2021 | Nov 30, 2021 |
Common Milkweed (Asclepias exaltata) vs. Poke Milkweed (Asclepias exaltata) | Sep 22, 2021 | Sep 22, 2021 |
Small-Flowered Buttercup (Ranunculus allegheniensis) vs. Allegheny Mountain buttercup (Ranunculus allegheniensis) | May 27, 2021 | May 27, 2021 |
Small-Flowered Buttercup (Ranunculus micranthus) vs. Rock Buttercup (Ranunculus micranthus) | May 27, 2021 | May 27, 2021 |
Golden Alexanders (Thaspium trifoliatum) vs. Meadow Parsnip (Thaspium trifoliatum) | May 06, 2021 | May 06, 2021 |
Wild Parsnip (Zizia aurea) vs. Golden Alexanders (Zizia aurea) | May 05, 2021 | May 05, 2021 |
Heart-Leaf Golden Alexander (Zizia aurea) vs. Golden Alexanders (Zizia aurea) | May 05, 2021 | May 05, 2021 |
Common Star of Bethlehem (Ornithogalum nutans) vs. Drooping Star of Bethlehem (Ornithogalum nutans) | Apr 19, 2021 | Apr 19, 2021 |
Scarlet Oak (Quercus ellipsoidalis) vs. Hill's Oak (Quercus ellipsoidalis) | Feb 15, 2021 | Feb 15, 2021 |
Laurel Oak (Quercus hemisphaerica) vs. Darlington Oak (Quercus hemisphaerica) | Feb 05, 2021 | Feb 05, 2021 |
Virginia Pine (Pinus pungens) vs. Table Mountain Pine (Pinus pungens) | Jan 28, 2021 | Jan 28, 2021 |
American Basswood (Tilia cordata) vs. Littleleaf Linden (Tilia cordata) | Jan 25, 2021 | Jan 25, 2021 |
English Ivy (Hedera hibernica) vs. Atlantic Ivy (Hedera hibernica) | Jan 22, 2021 | Jan 22, 2021 |
European Holly (Ilex cornuta) vs. Chinese Holly (Ilex cornuta) | Jan 20, 2021 | Jan 23, 2021 |
Chinquapin Oak (Quercus prinoides) vs. Dwarf Chinquapin Oak (Quercus prinoides) | Jan 06, 2021 | Jan 06, 2021 |
Northern Red Oak (Quercus shumardii) vs. Shumard's Oak (Quercus shumardii) | Oct 05, 2020 | Oct 05, 2020 |
Trumpetweed (Eutrochium purpureum) vs. Sweetscented Joe Pye Weed (Eutrochium purpureum) | Sep 21, 2020 | Sep 21, 2020 |
Southern Red Oak (Quercus pagoda) vs. Cherrybark Oak (Quercus pagoda) | Sep 11, 2020 | Sep 11, 2020 |
Overcup Oak (Quercus macrocarpa) vs. Bur Oak (Quercus macrocarpa) | Aug 28, 2020 | Oct 01, 2020 |
White Snakeroot (Boehmeria cylindrica) vs. Smallspike False Nettle (Boehmeria cylindrica) | Jul 16, 2020 | Jul 16, 2020 |
Siberian Elm (Ulmus parvifolia) vs. Chinese Elm (Ulmus parvifolia) | Jun 26, 2020 | Jun 26, 2020 |
Northern Red Oak (Quercus falcata) vs. Southern Red Oak (Quercus falcata) | Jun 19, 2020 | Aug 23, 2022 |
Honewort (Aegopodium podagraria) vs. Bishop's Goutweed (Aegopodium podagraria) | Jun 12, 2020 | Jun 12, 2020 |
Sassafras (Lindera benzoin) vs. Northern Spicebush (Lindera benzoin) | Jun 10, 2020 | Jun 10, 2020 |
Engelmann Spruce (Picea pungens) vs. Blue Spruce (Picea pungens) | Apr 13, 2020 | Apr 13, 2020 |
Pitch Pine (Pinus pungens) vs. Table Mountain Pine (Pinus pungens) | Mar 06, 2020 | Mar 06, 2020 |
Pin Oak (Quercus ellipsoidalis) vs. Hill's Oak (Quercus ellipsoidalis) | Mar 06, 2020 | Mar 06, 2020 |
Tall Blue Lettuce (Lactuca canadensis) vs. Canada Lettuce (Lactuca canadensis) | Mar 02, 2020 | Mar 02, 2020 |
Gray Birch (Betula alleghaniensis) vs. Yellow Birch (Betula alleghaniensis) | Feb 20, 2020 | Feb 20, 2020 |
White Oak (Quercus stellata) vs. Post Oak (Quercus stellata) | Jan 30, 2020 | Oct 19, 2020 |
Red Spruce (Picea mariana) vs. Black Spruce (Picea mariana) | Nov 29, 2019 | Nov 29, 2019 |
White Ash (Fraxinus quadrangulata) vs. Blue Ash (Fraxinus quadrangulata) | Nov 22, 2019 | Nov 22, 2019 |
White Mulberry (Fatoua villosa) vs. Hairy Crabweed (Fatoua villosa) | Nov 14, 2019 | Nov 14, 2019 |
River Birch (Betula alleghaniensis) vs. Yellow Birch (Betula alleghaniensis) | Nov 11, 2019 | Dec 10, 2019 |
White Snakeroot (Conoclinium coelestinum) vs. Blue Mistflower (Conoclinium coelestinum) | Nov 08, 2019 | Sep 29, 2021 |
Common Pear (Pyrus calleryana) vs. Callery Pear (Pyrus calleryana) | Nov 07, 2019 | Jul 15, 2020 |
Pitch Pine (Pinus banksiana) vs. Jack Pine (Pinus banksiana) | Nov 01, 2019 | Jan 04, 2023 |
Eastern White Pine (Pinus banksiana) vs. Jack Pine (Pinus banksiana) | Nov 01, 2019 | Nov 01, 2019 |
Jack Pine (Pinus sylvestris) vs. Scots Pine (Pinus sylvestris) | Nov 01, 2019 | Nov 01, 2019 |
Blackjack Oak (Quercus velutina) vs. Black Oak (Quercus velutina) | Oct 28, 2019 | Dec 08, 2020 |
Southern Red Oak (Quercus marilandica) vs. Blackjack Oak (Quercus marilandica) | Oct 28, 2019 | Oct 16, 2020 |
Striped Maple (Acer spicatum) vs. Mountain Maple (Acer spicatum) | Oct 23, 2019 | Jun 05, 2022 |
American Sweetgum (Kalopanax septemlobus) vs. Castor-Aralia (Kalopanax septemlobus) | Oct 22, 2019 | Oct 22, 2019 |