Guava is guava. Guava (Psidium guajava Linn) is a tree of Myrtaceae with a height of13m; The bark is smooth, gray and flaky; The shoots are angular and hairy. Leaf blade leathery, oblong to elliptic, apex acute or obtuse, base nearly round, slightly rough above, hairy below, lateral veins usually depressed, reticulate veins obvious; The petiole is 5 mm long.

Flowers solitary or 2-3 arranged in cymes; The calyx tube is bell-shaped and hairy, and the calyx cap is irregularly cracked; Petals white; Stamens 6-9 mm long; The ovary is inferior, connate with the calyx, and the style is as long as the stamens. Berry is spherical, oval or pear-shaped, with persistent sepals at the top, white and yellow flesh, hypertrophy of placenta, fleshy and red; There are many kinds of seeds.

Native to South America. Cultivated in all parts of South China, the common species is Yi, which reaches Anning Valley in southwest Sichuan in the north and is born in wasteland or low hills. Fruit eaten; Leaves contain volatile oil and tannins. Used as medicine, it has the effects of stopping dysentery, stopping bleeding and strengthening stomach. Boil the leaves to remove tannins and dry them in the sun to make tea, which is sweet and has the effect of clearing heat.