Little else was produced in these times but compilations, of the most meagre kind, chiefly of the nature of herbals, or domestic receiptbooks; among the authors of which it may be sufficient to name Serenus Sammonicus (3rd century), Gargilius Martialis (3rd century) and Marcellus Empiricus (5th century).
Indeed, formerly grass (also spelt gwrs, gres, gyrs in the old herbals) meant any green herbaceous plant of small size.
It is also known as adder's foot, golden maidenhair and wood-fern, and is the oakfern of the old herbals.
In the herbals and older treatises on materia medica and therapeutics no explanation is usually offered of the action of medicines, and in such works as that of Cullen (1789) only a few of the more obvious actions are occasionally explained according to the current theories of physiology and pathology.
The problem with the FDA regulating is that herbals are less studied (the FDA relies heavily on studies) and also this is not completely along the lines of traditional FDA expertise.