He was a pupil of Aristotle (370-c to 285 B.C.). Like you, he too was a student of aquatic plants:

“For there are some plants which cannot live except in wet; and again these are distinguished from one another by their fondness for different kinds of wetness; so that some grow in marshes, others in lakes, others in rivers, others even in the sea…Some are water plants to the extent of being submerged, while some project a little from the water; of some again the roots and a small part of the stem are under the water, but the rest of the body is altogether above it.“