Catkin, the seeds of willow, has white fluff on it, dancing with the wind, like floating catkin, so it is called catkin. Willow: tree height 18m, crown evacuation. Bark is grayish black and irregularly cracked; The branches are thin, drooping and hairless. Bud linear, apex acute. The leaves are narrowly lanceolate, 9- 16 cm long and 0.5- 1.5 cm wide, with tapering tips, wedge-shaped base and serrated edges; Petiole 5- 10 mm long, pubescent; Stipules only grow on budding branches.

Liu's flowers are unisexual. Flowers have no perianth, only scales. The male flower of willow has two stamens and two nectaries. The female flower of willow has a pistil and a nectary. Although the flowers of willow have no perianth and are not bright in color, they have nectar, which is used to lure insects to spread pollen, so they are insect-borne flowers. Poplar flowers are very similar to willow trees, with simple structure, but without nectar. They can't secrete nectar to induce insects to spread pollen, so they can only spread pollen by wind, so they are wind-borne flowers.

Explanation:

(1) willow seeds. There is white hair on it, which floats with the wind, like floating floc, because it is called barking.

In the Southern Dynasties, Liang Yu Jianwu's poem "Spring Day" said: "Peach red catkins are white, and the sun shines with the wind."

The fifth part of Du Fu's quatrains in Tang Dynasty: "Crazy catkins dance with the wind, and fine peach blossoms chase the water."

Song Sushi's "Pear Blossom in Donglan, Confucius House": "Pear Blossoms are pale in Bai Liu and dark green, and willow flowers are full."

Yan Shu's poem "Implication": "The pear flower garden melts the moon, and the catkin pond is light."

The seventy-first time in a dream of red mansions: "I think catkin is a frivolous rootless thing." In my opinion, I must talk about it so as not to fall into the trap. "

Yang Shuo's Story Club: "The warm sunshine fills the windows, and the soft catkins are flying all over the sky. "

Xue Tao's Catkin: "In February, the young flowers are light and faint, and the spring breeze shakes people's clothes." His family is a heartless thing, and every time he flies south, he flies north. "