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3D Models of Grass on Flatpyramid.
The grass is the life form of higher plants. Herbs have leaves and stems that die off to the soil surface at the end of the growing season. They do not have a permanent tree trunk above the ground. Herbaceous plants are both annual and biennial, and perennial.
Some relatively rapidly growing herbaceous plants (especially annual ones) are pioneer plants, the first to inhabit new habitats and determine the anagenesis of plant species. Other plant species form the main vegetation of many stable habitats, developing, for example, in the surface layer of forests or in natural open habitats such as meadows, salt marshes or deserts.
The main indicator of this life form is the absence of perennial aboveground parts capable of surviving the unfavorable season. This feature is by far the most easily applicable to plants existing in the conditions of the northern seasonal climate: summer — winter. In the southern deserts or the tropics, this feature is applicable, but with great reservations. So, in the tropics, where there is no winter, no dry seasons, grasses can have perennial above-ground parts and reach very impressive sizes. Therefore, biologists try to use other signs to distinguish the grass: lack of woody aerial parts, their juiciness, fleshyness (many parenchyma), poor cambium work and lack of secondary thickening, strongly parenchymal (“diluted” with soft tissues) conducting system, etc. However, All these signs do not always work. Thus, lignification is, to varying degrees, characteristic of many grasses; among the trees and shrubs there are soft, almost herbaceous forms. Complicating matters is the fact that there are many transitional, intermediate forms between grass and woody plants.