The stem is erect and tree-shaped, with a height of 10 m and a height of 30 m, with obvious annular leaf scars.

The leaves are clustered at the top of the stem, with a length of 1.3-2 m, numerous pinna, hairless on both sides, long and narrow, lanceolate, 30-60 cm long and 2.5-4 cm wide. The upper part of the feather is closed together, and the top is irregularly toothed.

Monoecious, the inflorescence is multi-branched, the inflorescence axis is thick and flat, the branches are tortuous, the length is 25-30 cm, the upper part is slender, the male flowers 1 row or 2 rows are planted, and the female flowers are solitary at the base of the branches.

Male flowers are small, sessile, usually solitary, rarely paired, sepals oval, less than 65438 0 mm long, petals oblong, 4-6 mm long, 6 stamens, short filaments, 3 degenerated pistils, linear.

The female flower is large, the sepals are oval, the petals are nearly round, the length is 1.2- 1.5 cm, and there are 6 staminodes, which are United; Ovary oblong.

Extended data:

Areca nut contains many nutrients and beneficial substances needed by human body. The main components of areca nut are 3 1. 1% phenol, 1.8% polysaccharide, 1.4% fat, 1.8% crude fiber, 9.9% moisture and 3.0%.

Betel nut also contains more than 20 kinds of trace elements, of which 1 1 is an essential trace element for human body.

Areca seed contains 0.3%-0.6% of total alkaloids, mainly arecoline, and a small amount of arecoline, norarecoline, isonorarecoline, arecoline and homoarecoline, all of which coexist with tannic acid. There are also dimers, trimers and tetramers of tannin, fat, mannitol, galactose, sucrose, catechin, epicatechin, colorless anthocyanin, areca catechu red pigment, saponin and proanthocyanidins.

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