There is a reasonable explaination for this.
If you read the Lost Tales 2 i think it states that the world as we know it is the same as Arda and therefore it is normal to believe that most of the botany har remained.
although some must have been lost i.e mallorn and athelas.
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Lissenen ar’ maska’lalaith tenna’ lye omentuva Aa’ menle nauva calen ar’ ta hwesta e’ ale’quenle
Aa’ menealle nauva calen ar’ malta
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