Senna alexandrina (Alexandrian Senna, Synonyms: Cassia acutifolia Delile) is an ornamental plant in the genus Senna. It is used in herbalism. It grows natively in upper Egypt, especially in the Nubian region, and near Khartoum (Sudan), where it is cultivated commercially. It is also grown elsewhere, notably in India and Somalia.
Alexandrian Senna is a shrubby plant that reaches 0.5–1, rarely two, metres in height with a branched, pale-green erect stem and long spreading branches bearing four or five pairs of leaves. These leaves form complex, feathery, mutual pairs. The leaflets vary from 4 to 6 pairs, fully edged, with a sharp top. The midribs are equally divided at the base of the leaflets.
Historically, Senna alexandrina was used in the form of senna pods, or as a tisane made from the leaves, as a laxative. Modern medicine has used extracts since at least the 1950s as a laxative.