Realms-Wide Flora
These plants may be found in any and all Realms.
Boranza Leaf

The boranza leaf is actually a mountainous flower in spite of its moniker. It only grows on snowless peaks, with red to reddish violet petals, and a gently glowing stigma and stamen. Its dark green leaves are sizeable - hence its name. These leaves stay close to the ground, and are covered in a furry substance.
This plant should be approached with caution, as it secretes an extremely dangerous poison. It is utilized by alchemists and the like to create many toxins in Felnova, Evylon, and Millirand. Furthermore, there are even more deadly subspecies of different colors in Lizzarkyth and Xaeri.
Karrak Tree

Twisted to adapt to its harsh environment, the Kuraian Karrak tree is a carnivorous plant which consumes those that are foolish enough to believe it is like any other tree. To assist with this, it often takes a similar form to other trees in the Realm - leafless and white-barked, with sharp, angular branches.
The Felnovian variant looks like an average oak until it is ready to consume a hapless victim, whereupon it grows a monstrous face - the teeth being made from the bark itself, and the eyes being indentations in the bark.
The Kurai version is the original Karrak Tree variant; it came about as several trees that were tainted by the magical overload of Lethias' and Neiren's otherworldly battle, and were forced to become carnivorous to survive. The Felnovian variant came centuries after, as seeds were accidentally brought cross-Realm, adapting its appearance to better fit its new home.
Necrobloom

A necrobloom is something between a fungus and a flora. It blooms much like a flower with humongous petals, extending about two feet from the center of the flower in brilliant magentas, neon oranges, and hot pinks. Its bright coloring should serve as a warning - while the necrobloom itself is a decomposer, often appearing on unattended corpses and consuming all but the bones themselves and even consuming the marrow within the bones, they are often markers of potential sites for undead to rise, as they thrive in areas with necromantic energies and also emanate these same energies.
The necrobloom itself uses spiney vines which slowly grow throughout a corpse, consuming it and sucking it dry. Upon the vines sensing there is no more to consume, it unleashes a cloud of numerous, lightweight spores into the air. Breathing in enough of these spores can start a necrobloom in an individual, and cause severe illness. If someone dies from this illness, they will be host to a necrobloom. Necroblooms can be found in any Realm - so long as there are dead bodies to infest, they can blossom.
Necrobloom spores can be alchemized into various chemicals - some of which act as decay-inducing toxins, others which are used as alchemical concoctions to induce states which allows the consumer to see ghosts and spirits of the dead.
Spiritstealer

A large, broad-leafed plant with velvety leaves and silver, white-green colors. It takes root in lush areas and has small white flowers that emanate a poisonous vapor that makes those around it become drowsy and sleepy. The spiritstealer draws from a unique source of energy - it taps into the energy directly from other living beings, both sentient and non. As a result, other plants do not grow near it as any that attempt to do so will quickly die.
The spiritstealer is theorized to have originated in the Shadowrealm and been loosed upon the Realms by accident, similar to the Karrak. It is known to inhabit areas close to swamplands, rivers, as well as southern scrubland in Felnova. In addition, it can be located in the Dark Realm and the demonic Realm of Kurai. The spirit-siphoning properties and poisonous fumes are harvested by alchemics and poisoncrafters Realms-wide.
Click on the title to see flora that are native to multiple Realms!