1, trees or creeping, cushioned, erect shrubs. The branches are cylindrical and the pith is nearly round. There is no terminal bud, the lateral buds are usually close to the branches, and the bud scales are single.

2. Leaves alternate, sparsely opposite, usually narrow and long, mostly lanceolate, pinnately veined, serrated or entire; Petiole short; Stipules, serrated, usually early, sparsely persistent.

3. The inflorescence of Zizania latifolia stands upright or spreads obliquely, opening leaves first, or opening with leaves at the same time, and opening after thinning leaves; Bracts entire, hairy or glabrous, persistent, sparsely caducous.

4. Stamens 2 are numerous, filaments are free or partially or completely connate; Gland 1-2 (located between inflorescence axis and filament, abdominal gland, subtebract, dorsal gland).

5. The pistil consists of 2 carpels, the ovary is sessile or stipitate, the styles are different in length, or missing, single 1 or dehiscent, the stigma 1-2, dehiscent or not.

Extended data:

The main value of willow:

1, garden value

There are many kinds of willows, which are easy to cross. Hybrid has strong growth potential and adaptability, and it is easy to reproduce asexually. You can choose from natural or artificial hybrid populations and obtain excellent clonal varieties through asexual propagation. In addition, a large number of high-quality seedlings can be obtained quickly by plant tissue culture. Breeding based on garden ornamental should focus on improving its branches, leaves and tree shape, and improving its anti-pollution ability and pruning and shaping ability.

2. Economic value

Bark contains tannin; The material is worse than willow, which can be used as utensils and paper raw materials; Catkin can fill chair cushions and pillows; Branches and fibrous roots can dispel wind and remove dampness. There is a cloud in the poem: the willow is dark and the flowers are bright. It shows that willow is extremely easy to survive. The fiber of willow bark can be used as raw material for textile and rope making; Branches can be woven into baskets, baskets, crates and helmets. Wood is white and tough.

3. Environmental governance

Sweden obtains bioenergy by cultivating short-rotation willow dwarf forest (hereinafter referred to as willow dwarf forest). The afforestation of willow dwarf forest is mainly agricultural land, and the generated biomass is used for cogeneration of regional heating plants.

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