Trees
Alder - when Claire is rescued from Jack Randall after she first falls through the stones she is taken through a 'scrim of alder' (Outlander, chapter 3), she meets Geillis for the first time beneath an alder (Outlander, chapter 9) When Jamie and Claire find a place to sleep after the Battle of Prestonpans they end up in a small clearing thick with the leaves of ash, alder and sycamore (DIA, chapter 36) alders grow near Beaufort Castle (DIA, chapter 40)
Ash - When Jamie and Claire find a place to sleep after the Battle of Prestonpans they end up in a small clearing thick with the leaves of ash, alder and sycamore (DIA, chapter 36)
Aspen - when Claire faints after her marriage to Jamie she comes to under an aspen tree (Outlander, chapter 14) Aspens grow in the cemetery at L'Hopital des Anges (V, chapter 40)
Beech - Claire rests under a beech tree on her back to Lallybroch after visiting tenants (DIA, chapter 31)
Birch - the hillside leading to the saint's pool that Dougal takes Claire to is overgrown with birch (Cross Stitch only, chapter 13) birch grow near Beaufort Castle (DIA, chapter 40)
Bougainvillea - pink bougainvillea grows in the courtyard of Father Fogden's hacienda (V, chapter 50)
Chestnut - Colum has potted chestnut trees growing in his bird cage at Castle Leoch (Outlander, chapter 5) Chestnut trees grow at Versailles (DIA, chapter 9)
Copper beech - Jamie dreams of Claire being in the glen near Lallybroch surrounded by copper beeches (V, chapter 11)
Cyprus - growing in the Duke of Sandringham's garden in Paris (DIA, chapter 20)
Elms - outside Mrs Baird's Inn in Inverness (Outlander only, chapter 1), Colum has potted elm trees growing in his bird cage at Castle Leoch (Outlander, chapter 5), Claire can see elms from the window of her surgery at Leoch (Outlander only, chapter 24), there is an elm grove at Lallybroch (Outlander, chapter 27)
Guava - growing in the courtyard in Father Fogden's hacienda (V, chapter 50)
Holly - Colum's Hall is decorated with sprigs of holly (Outlander, chapter 6), The hall at Castle Leoch was decked with holly branches for the Gathering (Outlander, chapter 10) Lallybroch was decorated with holly and ivy for Hogmanay when Laoghaire and Jamie were reunited (V, chapter 37)
Horse chestnut - When Jamie and Claire find a place to sleep after the Battle of Prestonpans, Jamie leads Claire under the drooping limbs of a large horse chestnut (DIA, chapter 36)
Juniper - Claire pounds juniper berries in her surgery at Leoch (Cross Stitch only, chapter 24)
Larch - growing in the Highlands (Outlander only, chapter 17) larch grow near Beaufort Castle (DIA, chapter 40) growing in the Lake District (V, chapter 14) Larches grow in the cemetery at L'Hopital des Anges (V, chapter 40)
Lime trees - outside Mrs Baird's Inn in Inverness (Cross Stitch only, chapter 1)
Maple trees - growing in the Lake District (V, chapter 14)
Myrtle - The hall at Castle Leoch was decked with myrtle branches for the Gathering (Outlander, chapter 10)
Norway spruce - a Norway spruce grows outside the nursery at Helwater and Jamie climbs it to peek at his son (V, chapter 15)
Oaks - when Claire comes too after falling through the stones at Craigh na Dun she finds herself near a stand of oak saplings (Outlander only, chapter 2). There are stunted oaks near Cocknammon Rock (Outlander only, chapter 3), Colum has potted oak trees growing in his bird cage at Castle Leoch (Outlander, chapter 5)
Palmetto trees - Claire walks through a palmetto grove in Hispaniola (V, chapter 50). Palmetto means 'little palm' and is used generically to refer to many different types of small palm trees
Pine trees - When Claire is looking for the lights of Inverness she sees nothing but pine trees (Outlander, chapter 3) there are pines on the ridge on the west side of Lallybroch (DIA, chapter 31)
Plane tree - Ian puts his gear under the shelter of a plane tree when it looks as if it might rain (Virgins)
Plum trees - when Claire wakes in Paris on a beautiful spring morning she can imagine the plum blossoms bursting in the gardens of Versailles (DIA, chapter 17)
Poplars - Claire uses poplar-bud salve to treat a thumb infection (Outlander only, chapter 9) Poplars grow at Versailles (DIA, chapter 9)
Red ash - growing near the copse where Jamie leaves Claire when he goes to see Horrocks (Outlander only, chapter 20)
Rowan tree - there is one growing by the saint's pool that Dougal takes Claire to after she's seen Jack Randall (Outlander, chapter 13) Claire remembers Geillis being burnt as a witch beneath the branches of a rowan tree, although Claire never actually witnessed this (DIA, chapter 42) there is a rowan tree growing by Jamie's cave (V, chapter 6) when Claire wakes after going back through the stones to Jamie she sees that she has fallen down under a rowan tree (V, chapter 24)
Sycamore - growing in the Highlands (Outlander only, chapter 17) When Jamie and Claire find a place to sleep after the Battle of Prestonpans they end up in a small clearing thick with the leaves of ash, alder and sycamore (DIA, chapter 36)
Willows - there are willows by the pool where Jamie teaches Claire to tickle trout (Outlander, chapter 16)
Yew - The hall at Castle Leoch was decked with yew branches for the Gathering (Outlander only, chapter 10) Yew trees grow in the kirkyard of St Kilda (DIA, chapter 5)
Ash - When Jamie and Claire find a place to sleep after the Battle of Prestonpans they end up in a small clearing thick with the leaves of ash, alder and sycamore (DIA, chapter 36)
Aspen - when Claire faints after her marriage to Jamie she comes to under an aspen tree (Outlander, chapter 14) Aspens grow in the cemetery at L'Hopital des Anges (V, chapter 40)
Beech - Claire rests under a beech tree on her back to Lallybroch after visiting tenants (DIA, chapter 31)
Birch - the hillside leading to the saint's pool that Dougal takes Claire to is overgrown with birch (Cross Stitch only, chapter 13) birch grow near Beaufort Castle (DIA, chapter 40)
Bougainvillea - pink bougainvillea grows in the courtyard of Father Fogden's hacienda (V, chapter 50)
Chestnut - Colum has potted chestnut trees growing in his bird cage at Castle Leoch (Outlander, chapter 5) Chestnut trees grow at Versailles (DIA, chapter 9)
Copper beech - Jamie dreams of Claire being in the glen near Lallybroch surrounded by copper beeches (V, chapter 11)
Cyprus - growing in the Duke of Sandringham's garden in Paris (DIA, chapter 20)
Elms - outside Mrs Baird's Inn in Inverness (Outlander only, chapter 1), Colum has potted elm trees growing in his bird cage at Castle Leoch (Outlander, chapter 5), Claire can see elms from the window of her surgery at Leoch (Outlander only, chapter 24), there is an elm grove at Lallybroch (Outlander, chapter 27)
Guava - growing in the courtyard in Father Fogden's hacienda (V, chapter 50)
Holly - Colum's Hall is decorated with sprigs of holly (Outlander, chapter 6), The hall at Castle Leoch was decked with holly branches for the Gathering (Outlander, chapter 10) Lallybroch was decorated with holly and ivy for Hogmanay when Laoghaire and Jamie were reunited (V, chapter 37)
Horse chestnut - When Jamie and Claire find a place to sleep after the Battle of Prestonpans, Jamie leads Claire under the drooping limbs of a large horse chestnut (DIA, chapter 36)
Juniper - Claire pounds juniper berries in her surgery at Leoch (Cross Stitch only, chapter 24)
Larch - growing in the Highlands (Outlander only, chapter 17) larch grow near Beaufort Castle (DIA, chapter 40) growing in the Lake District (V, chapter 14) Larches grow in the cemetery at L'Hopital des Anges (V, chapter 40)
Lime trees - outside Mrs Baird's Inn in Inverness (Cross Stitch only, chapter 1)
Maple trees - growing in the Lake District (V, chapter 14)
Myrtle - The hall at Castle Leoch was decked with myrtle branches for the Gathering (Outlander, chapter 10)
Norway spruce - a Norway spruce grows outside the nursery at Helwater and Jamie climbs it to peek at his son (V, chapter 15)
Oaks - when Claire comes too after falling through the stones at Craigh na Dun she finds herself near a stand of oak saplings (Outlander only, chapter 2). There are stunted oaks near Cocknammon Rock (Outlander only, chapter 3), Colum has potted oak trees growing in his bird cage at Castle Leoch (Outlander, chapter 5)
Palmetto trees - Claire walks through a palmetto grove in Hispaniola (V, chapter 50). Palmetto means 'little palm' and is used generically to refer to many different types of small palm trees
Pine trees - When Claire is looking for the lights of Inverness she sees nothing but pine trees (Outlander, chapter 3) there are pines on the ridge on the west side of Lallybroch (DIA, chapter 31)
Plane tree - Ian puts his gear under the shelter of a plane tree when it looks as if it might rain (Virgins)
Plum trees - when Claire wakes in Paris on a beautiful spring morning she can imagine the plum blossoms bursting in the gardens of Versailles (DIA, chapter 17)
Poplars - Claire uses poplar-bud salve to treat a thumb infection (Outlander only, chapter 9) Poplars grow at Versailles (DIA, chapter 9)
Red ash - growing near the copse where Jamie leaves Claire when he goes to see Horrocks (Outlander only, chapter 20)
Rowan tree - there is one growing by the saint's pool that Dougal takes Claire to after she's seen Jack Randall (Outlander, chapter 13) Claire remembers Geillis being burnt as a witch beneath the branches of a rowan tree, although Claire never actually witnessed this (DIA, chapter 42) there is a rowan tree growing by Jamie's cave (V, chapter 6) when Claire wakes after going back through the stones to Jamie she sees that she has fallen down under a rowan tree (V, chapter 24)
Sycamore - growing in the Highlands (Outlander only, chapter 17) When Jamie and Claire find a place to sleep after the Battle of Prestonpans they end up in a small clearing thick with the leaves of ash, alder and sycamore (DIA, chapter 36)
Willows - there are willows by the pool where Jamie teaches Claire to tickle trout (Outlander, chapter 16)
Yew - The hall at Castle Leoch was decked with yew branches for the Gathering (Outlander only, chapter 10) Yew trees grow in the kirkyard of St Kilda (DIA, chapter 5)