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Skeins of yarn dyed with madder root, Rubia tinctorum. Rubia was an economically important source of a red pigment in many regions of Asia, Europe and Africa. [3] The genus name Rubia derives from the Latin ruber meaning "red". The plant's roots contain an anthracene compound called alizarin that gives its red colour to a textile dye known as ...
The pulverised roots can be dissolved in sulfuric acid, which leaves a dye called garance (the French name for madder) after drying. Another method of increasing the yield consisted of dissolving the roots in sulfuric acid after they had been used for dyeing. This produces a dye called garanceux. By treating the pulverized roots with alcohol ...
Lithospermum erythrorhizon, commonly called purple gromwell, red stoneroot, red gromwell, red-root gromwell and redroot lithospermum, is a plant species in the family Boraginaceae. [1] It is called zǐcǎo ( 紫草 ) in Chinese, jichi ( 지치 ) in Korean, and murasaki ( ムラサキ ; 紫 ) in Japanese.
Rubia cordifolia was the source of an economically important red pigment in many regions of Asia, Europe and Africa. It was extensively cultivated from antiquity until the mid-nineteenth century. The plant's roots contain an anthraquinone called purpurin (1,2,4-Trihydroxyanthraquinone) that gives it its red colour when used as a textile dye.
In order to escape shade, plants adjust their root architecture, most notably by decreasing the length and amount of lateral roots emerging from the primary root. Experimentation of mutant variants of Arabidopsis thaliana found that plants sense the Red to Far Red light ratio that enters the plant through photoreceptors known as phytochromes. [26]
Its viviparous "seeds", in actuality called propagules, become fully mature plants before dropping off the parent tree. [3] These are dispersed by water until eventually embedding in the shallows. Rhizophora mangle grows on aerial prop roots, which arch above the water level, giving stands of this tree the characteristic "mangrove" appearance ...
Ceanothus americanus is a shrub that lives up to fifteen years and growing between 18 and 42 in (0.5 and 1 m) high, having many thin branches.Its root system is thick with fibrous root hairs close to the surface, but with stout, burlish, woody roots that reach deep into the earth—root systems may grow very large in the wild, to compensate after repeated exposures to wildfires.
Rhizophora is a genus of tropical mangrove trees, sometimes collectively called true mangroves. The most notable species is the red mangrove (Rhizophora mangle) but some other species and a few natural hybrids are known. Rhizophora species generally live in intertidal zones which are inundated daily by the ocean.