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Miss Chen
2020年06月01日
Miss Chen
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ritau
2020年05月31日
ritau
Camellia is a genus of flowering plants in the family Theaceae. They are found in eastern and southern Asia, from the Himalayas east to Japan and Indonesia. There are 100–300 described species, with some controversy over the exact number. There are also around 3,000 hybrids. The genus was named by Linnaeus after the Jesuit botanist Georg Joseph Kamel, who worked in the Philippines and described a species of camellia (although Linnaeus did not refer to Kamel's account when discussing the genus). Camellias are famous throughout East Asia; they are known as cháhuā (茶花, 'tea flower') in Chinese, tsubaki (椿) in Japanese, dongbaek-kkot (동백꽃) in Korean, and as hoa trà or hoa chè in Vietnamese. Of economic importance in East Asia, Southeast Asia, and the Indian subcontinent, leaves of C. sinensis are processed to create the popular beverage tea. The ornamental C. japonica, C. sasanqua and their hybrids are the source of hundreds of garden cultivars. C. oleifera produces tea seed oil, used in cooking and cosmetics. Camellias are evergreen shrubs or small trees up to 20 m (66 ft) tall. Their leaves are alternately arranged, simple, thick, serrated, and usually glossy. Their flowers are usually large and conspicuous, one to 12 cm in diameter, with five to nine petals in naturally occurring species of camellias. The colors of the flowers vary from white through pink colors to red; truly yellow flowers are found only in South China and Vietnam. Tea varieties are always white-flowered. Camellia flowers throughout the genus are characterized by a dense bouquet of conspicuous yellow stamens, often contrasting with the petal colors.The so-called "fruit" of camellia plants is a dry capsule, sometimes subdivided in up to five compartments, each compartment containing up to eight seeds. [图片]The various species of camellia plants are generally well-adapted to acid soils rich in humus, and most species do not grow well on chalky soil or other calcium-rich soils. Most species of camellias also require a large amount of water, either from natural rainfall or from irrigation, and the plants will not tolerate droughts. However, some of the more unusual camellias – typically species from karst soils in Vietnam – can grow without too much water. Camellia plants usually have a rapid growth rate. Typically they will grow about 30 cm per year until mature – though this does vary depending on their variety and geographical location. Camellia plants are used as food plants by the larvae of a number of Lepidoptera species; see List of Lepidoptera that feed on Camellia. Leaves of the Japanese camellia (C. japonica) are susceptible to the fungal parasite Mycelia sterile. Camellia sinensis, the tea plant, is of major commercial importance because tea is made from its leaves. The species C. sinensis is the product of many generations of selective breeding in order to bring out qualities considered desirable for tea. However, many other camellias can be used to produce a similar beverage. For example, in some parts of Japan, tea made from C. sasanqua leaves is popular. Tea oil is a sweet seasoning and cooking oil made by pressing the seeds of C. oleifera, C. japonica, and to a lesser extent other species such as C. crapnelliana, C. reticulata, C. sasanqua and C. sinensis. Relatively little-known outside East Asia, it is the most important cooking oil for hundreds of millions of people, particularly in southern China. Camellia oil is commonly used to clean and protect the blades of cutting instruments. [图片]Camellia oil pressed from seeds of C. japonica, also called tsubaki oil or tsubaki-abura (椿油) in Japanese, has been traditionally used in Japan for hair care.
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Miss Chen
2020年05月31日
Miss Chen
夏天给多肉浇水是很多肉友十分头疼的问题,那么夏季多肉要不要浇水呢?下面我们就来了解一下。 [图片]1、夏天到底要不要给多肉浇水 多肉夏天要不要浇水还是要根据多肉的生长属性来决定,有些多肉在夏季不会进入休眠,还是会正常的生长,那么这样的多肉就需要浇水,否则多肉会因为干旱缺水而死亡,但是有一些多肉在夏季高温的环境中会进入休眠,这样的多肉我们就需要少浇水甚至是不浇水,如果浇水过多会导致积水,造成多肉的根部腐烂。 [图片]2、夏天怎么给多肉浇水 浇水时间 夏天给多肉浇水的时候,一定不能在中午浇水,因为中午的温度是一天当中最高的,如果这时候给多肉浇水,那么水分在高温的环境中会很快的蒸发,这样多肉的根部就会处在一个又热又湿的环境中,很容易导致多肉的根部腐烂。 浇水频率 夏天给多肉浇水不要过于频繁,如果平时每隔半个月浇一次水,那么在夏季的时候可以适当的延长浇水的间隔,比如延长的三个星期或是一个月,这样多肉就不会因为浇水过多而出现烂根的情况。 浇水的量 夏天给多肉浇水量也不要太大,不需要一次就将土壤浇透,因为夏季大部分的多肉都会进入休眠,所以对水分的需求很低,如果浇水的量过多,多肉也不会吸收,所以就容易烂根,我们在浇水的时候,可以沿着盆边少量的浇水,让水分在土壤中充分的扩散,这样更有利于多肉的根部吸收水分。
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ritau
2020年05月28日
ritau
Fasciation (from the Latin root meaning "band" or "stripe"), also known as cresting, is a relatively rare condition of abnormal growth in vascular plants in which the apical meristem (growing tip), which normally is concentrated around a single point and produces approximately cylindrical tissue, instead becomes elongated perpendicularly to the direction of growth, thus producing flattened, ribbon-like, crested (or "cristate"), or elaborately contorted, tissue. Fasciation may also cause plant parts to increase in weight and volume in some instances.The phenomenon may occur in the stem, root, fruit, or flower head. Some plants are grown and prized aesthetically for their development of fasciation. Any occurrence of fasciation has several possible causes, including hormonal, genetic, bacterial, fungal, viral and environmental causes. Although fasciation is rare overall, it has been observed in over 100 plant species, including members of the genera Acer, Aloe, Acanthosicyos, Cannabis, Celosia, Cycas, Delphinium, Digitalis, Euphorbia, Forsythia, Glycine max (specifically, soybean plants), Primula, Prunus, Salix and many genera of the cactus family, Cactaceae. Cresting results in undulating folds instead of the typical "arms" found on mature saguaro cactus. [图片]Some varieties of Celosia are raised especially for their dependably fasciated flower heads, for which they are called "cockscomb". The Japanese fantail willow (Salix sachalinensis 'Sekka') is another plant that is valued for its fasciations. Fasciation that is caused by damage to genetic material and by bacteria can be controlled by not using fasciated plants and disposing of fasciated plants. Avoiding injury to plant bases and keeping them dry can reduce the spread of bacteria. Avoidance of grafting fasciated plants and the pruning of fasciated matter can also reduce the spread of bacteria. [图片]
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