SERRATULA, SAW-WORT; a genus of the polygamia æqualis order, belonging to the syngenesix class of plants. There are 16 species; the most remarkable of which are, 1. The tinctoria, or dyer's saw-wort, growing naturally in woods and pastures in many places of Britain. The leaves are lyre-shaped, with winged clefts; the terminating segment very large; the florets uniform: blossoms purple, but sometimes white. This is much used by the dyers to give a yellow colour; but being inferior to the yellow-weed, its use is confined to the coarser woollen cloths.—Goats eat it; horses are not fond of it; sheep, swine, and cows, refuse it. 2. The arvensis, corn saw-wort, or way-thistle, has toothed, thorny leaves; blossoms, pale purple. It grows wild in corn-fields and road-sides, and is said to yield a very pure fixed alkali when burnt. Goats eat it; neither cows, horses, sheep, nor swine, are fond of it.