1. Fagonia mollis DELILE (= F. grandiflora Boiss.). A small shrublet, nearly mat-shaped with quadrangular branches. Internodes longer than the short-petioled trifoliate leaves. Spines densely crowded, and as long as the internodes. Capsules 5 mm broad, 5 mm long with deciduous calyx. 3. Fagonia glutinosa DELILE. A perennial, prostrate, pubescent, pale-green plant with long internodes, usually covered with adherent sand. Leaves trifoliate, the central one twice as large as the lateral ones. Spines short, as long as petioles. Capsule 5 mm broad, 5 mm long covered with hairs and carried on short hairy reflexed peduncles, with persistent calyx. 4. Fagonia bruguieri DC. (= F. echinella Boiss.). A small perennial, procumbent, pale-green plant, attaining a height of 20 cm, with quadrangular stems and short internodes. Leaves trifoliate. Spines as long as leaves or longer, slightly recurved. Capsules 3—4 mm broad, 4 mm long on reflexed peduncles nearly as long as the capsule. Fruit-calyx persistent. 6. Fagonia arabica L. A small erect shrublet attaining a height of 30—50 cm. The plant is glandular, pubescent with trifoliate leaves below and unifoliate above. Spiny stipules longer than the leaves, nearly as long as the internodes. Capsule 5—7 mm broad, 3—5 mm long, carried on reflexed peduncles nearly as long as the capsules. Fruit calyx deciduous.