catkin
catkin
This data is reviewed by the project of data compilation and application of Science Encyclopedia of science popularization in China.
Catkins, that is, the seeds of willow trees, with white fluff on them, are scattered like floating catkins in the wind, so they are called catkins. Willow: arbor, up to 18m high, with canopy evacuation. Bark grayish black, irregularly dehiscent; branches slender, pendulous, glabrous. Buds linear, apex acute. Leaves narrowly lanceolate, 9-16cm long, 0.5-1.5cm wide, apex acuminate, base cuneate, margin serrate; petiole 5-10mm long, pubescent; stipules only on germinating branches.
morphological character
Inflorescence first leaves or open at the same time with leaves; male inflorescence 1.5-3cm long, short peduncle, axis hairy; stamen 2, anther red yellow; bracts lanceolate, outside hairy; gland 2; female inflorescence 2-5cm long, peduncle, base with 3-4 leaflets, axis hairy; ovary elliptic, sessile or subsessile, style short, stigma 2-4-cleft; bracts lanceolate, outside hairy; gland 1. The capsule is from March to April, flowering from March to April and fruiting from April to May.
Distribution range
It is distributed in the Yangtze River and Yellow River Basin, and planted in other places.
How to avoid catkins allergy
Meteorological experts said that dry, high temperature, sufficient light, low humidity, a certain wind speed weather is easy to cause catkins to float. On sunny days, catkins usually fly from 10 am to 16 PM. In the morning and evening, with the decrease of temperature and wind force, catkins flying will be reduced. The season of catkins flying all over the sky is the season of high incidence of various allergic symptoms.
Generally speaking, similar to pollen, catkins cause the most common allergic reactions, such as itchy skin, red eye conjunctiva, and serious edema, such as red and swollen eyes and lips. Catkins inhaled into the nasal cavity can cause strong irritation, runny nose, cough, asthma and other reactions, and even affect the quality of sleep. The allergic constitution of the crowd may cause respiratory tract edema, serious time will cause laryngeal edema, asphyxia, cause the possibility of life-threatening.
In daily life should pay attention to: 1. Windy days try to reduce going out, try to avoid flying catkins place. If you go out, you should wear a mask to cover your nose and mouth. After going home, you need to clean the exposed skin in time, and if possible, clean the nasal cavity; when you enter the room, you need to change clothes, and don't take the allergens home. 2. Long term window opening is not recommended in catkins season. Can use more air purifier, air purifier can filter impurities in air, including flocculent. 3. If the wool gets into the eyes, it must not be rubbed by hand, but washed with clean running water or wiped with sterilized cotton swab. 4. Once the allergy occurs, we must pay attention to eat less spicy food, eat more fruits, and add some anti allergic vitamin C. if the condition is not effectively relieved, we must go to the hospital for treatment.
Culture
In ancient times, "Yang" refers to the willow. Therefore, the poems are more like willows. In spring, many trees have not yet recovered, and willows have sprouted. "Willow Yiyi", "thousands of willows in the spring breeze", "willows curl weakly across the stream, just like a girl's waist". Poets associate willows with the spring light, and also compare it to a graceful girl.
Chinese PinYin : Liu Xu
catkin
