Rowna is the name of a race that existed in the Old Age Canon.
While the race is only in Old Age, the concept may appear in New Age at some point.
Rowna are a race of sentient plants that speak to each other through telepathy. They spend most of their time dormant, appearing to be no more than an odd-looking plant. Communication with them is impossible for most of the denizens of Vilous. Only those of other races who are the most in-tune with their spirit (in the style of "chi") have the potential to "speak" with them and unless this ability is trained communication may still be difficult.
Very few know much about them, but they are said to be very wise and have the longest lifespan of any race in Vilous.