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,
The Colours of Animals in evolution. She writes that Poulton's position was highly influential, stating that later "Darwinian experts on coloration" followed his views, citing Frank Evers Beddard's 1892 "Animal Coloration" as evidence. In his Introduction to Hugh Bamford Cott's 1940 book "Adaptive Coloration in Animals", Julian Huxley praised Cott's work as "a worthy successor to Sir Edward Poulton's "The Colours of Animals"... The one was a pioneer study, the other is in many respects the last word on the subject"". The Colours of Animals The Colours of Animals is a zoology book written in 1890 by Sir Edward Bagnall Poulton (1856–1943). It was