This is the 12851st most frequent Russian word.
кустарников
"Кустарников" means "shrubs" in English.
Here, 'кустарников' is used in the plural genitive case to denote the presence of a variety of shrubs in a location.
В лесу растёт множество кустарников.
In the forest, there grow many shrubs.
In this sentence, 'кустарников' is in the plural genitive case to specify types of shrubs being studied.
Я изучаю виды местных кустарников.
I am studying types of local shrubs.
Here, 'кустарников' is in the plural genitive case following the word 'несколько,' which requires this case form.