Essa explicação de Sanderson (na JordanCon, abril de 2016) parece implicar fortemente que não há sistema nervoso (como esse tecido implicaria animais).
Questioner I get the impression after reading Stormlight 1 and 2 that a lot of what you would consider to be flora, plant-life, is actually something like coral in the ocean which is actually an animal. So is there actually any flora on Roshar outside out of, like, Shinovar?
Brandon Sanderson Yeah, yeah, like almost all the things you see as flora are actual flora. Like, rockbuds are flora, trees are flora, shalebark is not, and some of the things like that-- haspers are not, and some of these things are more-- are animal life, are fauna. But grass is actually a flora, and trees.
Como um ponto extra, nenhum dos shemas mostrados sob a tempestade parece mostrar um sistema nervoso.

Com isso dito, não podemos comparar completamente a fisiologia com a das plantas terrestres, pois existem pelo menos duas diferenças fisiológicas muito importantes:
1. As plantas de Roharan podem usar o crem para compensar a fraca
..."lot of the trees that you'll find on Roshar, they will be using crem that falls and you use this to create shells, you use this to infuse your bark, they use this in a lot of different ways, the minerals there are very important because they're not getting from the soil what plants on our world get from soil"...
Sanderson At JordanCon, April 2016
2. As plantas rosharanas podem usar a luz da tempestade.
QuestionerFor Words of Radiance, could you put a comment about something in the upcoming books, something not too specific, just something I can think about? Something like "Renarin has a spren" you wrote for somebody else in The Way of Kings?
Brandon Sanderson [written] Stormlight makes plants grow.