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Dracaena trifasciata is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo. It is most commonly known as the snake plant, Saint George's sword, mother-in-law's tongue, and viper's bowstring hemp, among other names. [2] Until 2017, it was known under the synonym Sansevieria ...
Snake plant, Dracaena (formerly Sansevieria) trifasciata, is known as one of the toughest and most common houseplants. Aloe spp. including Aloe vera; Cactaceae (cacti) Epiphyllum (orchid cacti) Mammillaria; Opuntia (paddle cacti, including the prickly pear) Zygocactus (Christmas cactus) Gymnocalycium mihanovichii (chin cactus) Ceropegia woodii ...
Dracaena (/ d r ə ˈ s iː n ə / [2]) is a genus of about 200 species of trees and succulent shrubs. [3] The formerly accepted genera Pleomele and Sansevieria are now included in Dracaena . In the APG IV classification system , it is placed in the family Asparagaceae , [ 4 ] subfamily Nolinoideae (formerly the family Ruscaceae).
Dracaena aletriformis. Dracaena acaulis Baker; Dracaena acutissima Hua; Dracaena adamii Hepper; Dracaena aethiopica (Thunb.) Byng & Christenh. Dracaena afromontana Mildbr. Dracaena ajgal (Benabid & Cuzin) Rivas Mart., Molero Mesa, Marfíl & G.Benítez; Dracaena aletriformis (Haw.) Bos; Dracaena angolensis (Welw. ex Carrière) Byng & Christenh ...
Dracaena zeylanica is a leafier plant (10-16 leaves per rosette, versus generally 2–4 in Dracaena trifasciata), and its leaves lack a petiole, instead becoming only slightly narrower at the base. In D. trifasciata, leaves become narrower and thickened towards the bottom, forming a concave channel at the base of the leaves. [2]
Sansevieria ehrenbergii in habitat.. Sansevieria is a historically recognized genus of flowering plants, native to Africa, notably Madagascar, and southern Asia, now included in the genus Dracaena on the basis of molecular phylogenetic studies.
Perimetry or campimetry is one way to systematically test the visual field. [1] [failed verification] It is the systematic measurement of differential light sensitivity in the visual field by the detection of the presence of test targets on a defined background. Perimetry more carefully maps and quantifies the visual field, especially at the ...
If the observer is near-sighted, the image of the surface is formed in front of the retina. Since the speckle pattern is perceived by the brain to be on the retina, the effect is of parallax ; the speckle pattern appears to be nearer to the eye than the surface and hence moves in the same direction as the surface, but faster than the surface.