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Illustration of Oenothera biennis. Oenothera biennis usually has a life span of two years growing to 1.6 m (5 ft 3 in) tall in the seeding year. [7] The leaves are lanceolate, 8–18 cm (3–7 in) long and 2–6 cm (3 ⁄ 4 – 2 + 1 ⁄ 4 in) wide, [7] produced in a tight rosette the first year, and spirally on a stem the second year. However ...
Certain Oenothera plants have edible parts. The roots of O. biennis are reportedly edible in young plants. So are the flowers which have a sweet, crunchy taste. [20] The common evening primrose, O. biennis, is commonly sold as a dietary supplement in capsules containing the seed oil. [21]
The seed oil of Oenothera biennis (evening primrose) is a source of GLA. From GLA, the body forms dihomo-γ-linolenic acid (DGLA). This is one of the body's three sources of eicosanoids (along with AA and EPA.) DGLA is the precursor of the prostaglandin PGH 1, which in turn forms PGE 1 and the thromboxane TXA 1.
Oenothera gaura, formerly known as Gaura biennis, the biennial gaura or biennial beeblossom, is a North American flowering plant that can reach 6 ft (1.8 m) in height at maturity. Its upper half is made up of flowering stems, which are covered with soft, white hairs.
The leaves are commonly opposite or whorled, but are spirally arranged in some species; in most, they are simple and lanceolate in shape. The pollen grains in many genera are loosely held together by viscin threads.
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Oenothera speciosa is a herbaceous perennial wildflower. It has glabrous (smooth) to pubescent stems that grow to 50 centimetres (20 inches) in height. The pubescent leaves are alternate with very short or no petiole (sessile), reaching 10 cm (4 in) long to 4 cm (1 + 1 ⁄ 2 in) broad. They are variable in shape, from linear to obovate, and are ...
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