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A blue rose is a flower of the genus Rosa (family Rosaceae) that presents blue-to-violet pigmentation instead of the more common red, white, or yellow, through use of artificial means such as dyes. Blue roses are often used to symbolize mystery or the unattainable, [1] since they do not exist in nature because of genetic limitations.
The blue spruce ( Picea pungens ), also commonly known as green spruce, [2] Colorado spruce, or Colorado blue spruce, is a species of spruce tree native to North America in Arizona, Colorado, Idaho, New Mexico, Utah and Wyoming. [3] It is noted for its blue-green colored needles, and has therefore been used as an ornamental tree in many places ...
The blue and white bird in the background lacks the yellow pigment. The dark markings on both birds are due to the black pigment eumelanin . Biological pigments , also known simply as pigments or biochromes , [1] are substances produced by living organisms that have a color resulting from selective color absorption .
A leaf ( pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", [2] [3] while the leaves, stem, flower, and fruit collectively form the shoot system. [4]
Soursop (also called graviola, guyabano, and in Latin America guanábana) is the fruit of Annona muricata, a broadleaf, flowering, evergreen tree. [4] [5] It is native to the tropical regions of the Americas and the Caribbean and is widely propagated. [6] It is in the same genus, Annona, as cherimoya and is in the Annonaceae family.
Blue-pigmented organelles, known as "cyanosomes", exist in the chromatophores of at least two fish species, the mandarin fish and the picturesque dragonet. [41] More commonly, blueness in animals is a structural colouration; an optical interference effect induced by organized nanometre-sized scales or fibres.
A small green bamboo with narrow leaves. Indigenous to Hainan: Bambusa burmanica: Burmese bamboo 缅甸竹 Clumper 4.6 metres (15 ft) 2.5 centimetres (0.98 in) Nearly solid culms, with large leaves that can be up to a foot long; dense clumps with spiky low branches. Bambusa chungii: None 粉箪竹 Clumper 9.1 metres (30 ft) 51 millimetres (2.0 in)
Blue flower colour was always associated with something unusual and desired. Blue roses especially were assumed to be a dream that cannot be realised. Blue colour in flower petals is caused by anthocyanins, which are members of flavonoid class metabolites. We can diversify three main classes of anthocyanin pigments: cyaniding type (two hydroxyl ...