Not to be semantically confused with : Henbane (Hyoscyamus niger) [a very poisonous plant with similar name] nor with Henbit Dead-Nettle (Lamium Amplexicaule) a dead-nettle.

Easily mistaken for : other Amaranthaceae such as Good-King-Henry (Chenopodium bonus-henricus) but that is shorter with arrow-head shaped leaves, Many-seeded Goosefoot (Chenopodium polyspermum) but that has more-or-less un-toothed long oval leaves and is usually prostrate, etc.

In the olden days this plant was widely eaten as a vegetable, which is why it exists as a relic crop persistently coming up in the margins of arable fields and other disturbed ground which are rich in nitrogen. It does not like much competition from other plants. After flowering it falls over with over-bearing weight of foliage. The tiny clear / white spheres may help protect it from rain, for the plant is un-wettable.