The morphological characteristics of winter sunflower seeds
Morphological characteristics
Herbs annual, high 30 to 90 cm. Stems erect, sparsely hairy or a few glabrous. Leaves alternate; palmately 5- to 7-lobed, reniform or suborbicular, base cordate, margin serrate, palmately 5--7 veined, long-stalked. Flowers small, clustered in leaf axils, pale red, bracteoles 3, broadly linear; involute 5-lobed, lobes broadly triangular; corolla 5-merous, obovate, apex concave; stamens numerous, filaments united; ovary 10-12, each Room has an ovule. The fruit is oblate and consists of 10 to 12 carpels. When the fruit is ripe, the carpels are separated from each other and are detached from the central axis. The carpels are glabrous and pale brown.
A greenhouse(also called hothouse)is a building or complex in which allow for greater control over the growing environment of plants. Depending upon the technical specification of a greenhouse, key factors which may be controlled include temperature, levels of light and shade, irrigation, fertilizer application, and atmospheric humidity. Greenhouse may be used to overcome shortcomings in the growing qualities of a piece of land, such as a short growing season or poor light levels, greenhouses are often used for growing flowers, vegetables, fruits, transplants and seedlings. Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are polyethylene film and multiwall sheets of polycarbonate material, or PMMA acrylic glass. Commercial glass greenhouse are often high-tech production facilities for vegetables or flowers. The glass greenhouse are filled with equipment such as screening installations, heating, cooling and lighting, and may be automatically controlled by a computer.
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