CHENOPODIACEAE

The Chenopodioideae are a subfamily of the flowering plant family Amaranthaceae in the APG III system, which is largely based on molecular phylogeny, but were included - together with other subfamilies - in family Chenopodiaceae in the Cronquist system. Food species comprise Spinach (Spinacia oleracea), Good King Henry (Blitum bonus-henricus), several Chenopodium species (Quinoa, KaƱiwa, Fat Hen), Orache (Atriplex spp.), and Epazote (Dysphania ambrosioides).

The Chenopodioideae are annual or perennial herbs, subshrubs, shrub, or small trees.

The leaves are usually alternate and flat. The flowers are often unisexual. Many species are monoecious or have mixed inflorescences of bisexual and unisexual flowers. Some species are dioecious, like Spinacia, Grayia, Exomis, and Atriplex. In several species of tribe Atripliceae, the female flowers are without perianth, but enclosed by two bracts. The species with a perianth have up to five tepals. The seed is horizontal or vertical, with annular or horseshoe-shaped embryo.

The subfamily Chenopodioideae is distributed worldwide, but originates from Eurasia.

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