Botany

Botany - grow your knowledge with us.

Upgrade to Britannica Online

Take a tour, New improved britannica online

Imagine Britannica's 32-volume encyclopedia online right there for you, plus full access to articles. Amazing content, written by world experts, that you can cite for projects and assignments.

Click here for Britannica shop

khat

Slender, straight, East African tree (; family Celastraceae). Reaching a height of 80 ft (25 m), the khat tree has large, oval, finely toothed, bitter-tasting leaves. Its best-known relatives are the ornamentals euonymus and bittersweet. Khat leaves are chewed for the stimulants they contain, and the drug is central to social life in some countries.

Find more information on khat. Upgrade to Britannica Online for more on khat.

  • Britannica, just as colourful as Singapore
  • Singapore is a legendary city. Britannica has a legendary reputation for knowledge. With just a few clicks you can access all the quality information you can trust, online.