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Echinacea purpurea is a North American plant species with purple or pink cone-shaped flowers. It is used as an ornamental, a herbal remedy, and a food source for birds and bees.
Like all members of the sunflower family, the flowering structure is a composite inflorescence, with rose-colored (rarely yellow or white) florets arranged in a prominent, somewhat cone-shaped head – "cone-shaped" because the petals of the outer ray florets tend to point downward (are reflexed) once the flower head opens, thus forming a cone ...
Each plant may be a few inches tall, and pine-cone-shaped or cylindrical. The plant above ground is almost entirely made up of its inflorescence, a tightly packed column of thick cup-shaped flowers. The groundcone produces haustoria which penetrate the roots of its host and provide it with water and nutrients.
Echinacea pallida is a herbaceous perennial plant in the family Asteraceae, native to the central region of the United States and Ontario, Canada. It is sometimes grown in gardens and used for medicinal purposes, but its conservation status is threatened by habitat loss and over-collection.
Echinacea paradoxa is a rare and endangered species of flowering plant in the family Asteraceae. It has yellow, pink, or white ray florets and a dark reddish brown to nearly black central head, and is native to the Ozarks of Missouri and Arkansas.
Viola sororia, also known as common blue violet, is a perennial plant native to eastern North America. It has purple, blue, or white flowers with white throats and hairy petals, and is used for food, medicine, and ornamental purposes.
In primates, color vision may have evolved under selective pressure for a variety of visual tasks including the foraging for nutritious young leaves, ripe fruit, and flowers, as well as detecting predator camouflage and emotional states in other primates. [1] [2] [3]
The below table shows the cone complements for different types of human color vision, including those considered color blindness, normal color vision and 'superior' color vision. The cone complement contains the types of cones (or their opsins) expressed by an individual.
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