Flax have been domesticated just once from the wild species "Linum bienne", called pale flax. Several other species in the genus "Linum" are similar in appearance to "L. usitatissimum", cultivated flax, including some that have similar blue flowers, and others with white, yellow, or red flowers. Some of these are perennial plants, unlike "L. usitatissimum", which is an annual plant. Cultivated flax plants grow to tall, with slender stems. The leaves are glaucous green, slender lanceolate, 20–40 mm long, and 3 mm broad. The flowers are pure pale blue, 15–25 mm in diameter, with five petals. The fruit is a round,
Dianella (plant) name, Umberto Quattrocchi states that "Dianella" is "diminutive of Diana, the mythical goddess of hunting, the sylvan goddess. , the World Checklist of Selected Plant Families recognizes 41 species: Some species can be cultivated. They are frost-hardy and grow in full sun or partial shade. They can be propagated by division of the rhizome. Some plants have dense, attractive foliage and showy flowers and fruits. Reports of the edibility of the fruit range from very poisonous to sweet and nutty (such as "D. caerulea"), and the beach flax lily ("D. congesta") is reportedly the best-tasting. The leaves are used to